.opencode/node_modules/effect/dist/Channel.d.ts

/**
 * Provides low-level building blocks for streaming data through Effect.
 *
 * A `Channel` can read input elements, write output elements, fail with a typed
 * error, and finish with a typed result while managing resources safely.
 * Streams and sinks are built on channels, so most application code uses those
 * higher-level modules instead. This module is useful when implementing stream
 * operators or specialized streaming workflows.
 *
 * @since 2.0.0
 */
import * as Arr from "./Array.ts";
import * as Cause from "./Cause.ts";
import * as Chunk from "./Chunk.ts";
import * as Context from "./Context.ts";
import * as Effect from "./Effect.ts";
import * as Exit from "./Exit.ts";
import type * as Filter from "./Filter.ts";
import type { LazyArg } from "./Function.ts";
import * as Layer from "./Layer.ts";
import type { Severity } from "./LogLevel.ts";
import * as Option from "./Option.ts";
import type { Pipeable } from "./Pipeable.ts";
import type * as Predicate from "./Predicate.ts";
import * as PubSub from "./PubSub.ts";
import * as Pull from "./Pull.ts";
import * as Queue from "./Queue.ts";
import * as Schedule from "./Schedule.ts";
import * as Scope from "./Scope.ts";
import * as Take from "./Take.ts";
import { ParentSpan, type SpanOptions } from "./Tracer.ts";
import type * as Types from "./Types.ts";
import type * as Unify from "./Unify.ts";
/**
 * String literal type used as the unique brand for `Channel` values.
 *
 * @category type IDs
 * @since 4.0.0
 */
export type TypeId = "~effect/Channel";
/**
 * Runtime identifier stored on `Channel` values and used by `isChannel` to
 * recognize them.
 *
 * @category type IDs
 * @since 4.0.0
 */
export declare const TypeId: TypeId;
/**
 * Checks whether a value is a `Channel`.
 *
 * **Example** (Checking for channels)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.succeed(42)
 * console.log(Channel.isChannel(channel)) // true
 * console.log(Channel.isChannel("not a channel")) // false
 * ```
 *
 * @category guards
 * @since 3.5.4
 */
export declare const isChannel: (u: unknown) => u is Channel<unknown, unknown, unknown, unknown, unknown, unknown, unknown>;
/**
 * A `Channel` is a nexus of I/O operations, which supports both reading and
 * writing. A channel may read values of type `InElem` and write values of type
 * `OutElem`. When the channel finishes, it yields a value of type `OutDone`. A
 * channel may fail with a value of type `OutErr`.
 *
 * **Details**
 *
 * Channels are the foundation of Streams: both streams and sinks are built on
 * channels. Most users shouldn't have to use channels directly, as streams and
 * sinks are much more convenient and cover all common use cases. However, when
 * adding new stream and sink operators, or doing something highly specialized,
 * it may be useful to use channels directly.
 *
 * Channels compose in a variety of ways:
 *
 *  - **Piping**: One channel can be piped to another channel, assuming the
 *    input type of the second is the same as the output type of the first.
 *  - **Sequencing**: The terminal value of one channel can be used to create
 *    another channel, and both the first channel and the function that makes
 *    the second channel can be composed into a channel.
 *  - **Concatenating**: The output of one channel can be used to create other
 *    channels, which are all concatenated together. The first channel and the
 *    function that makes the other channels can be composed into a channel.
 *
 * **Example** (Typing channels)
 *
 * ```ts
 * import type { Channel } from "effect"
 *
 * // A channel that outputs numbers and requires no environment
 * type NumberChannel = Channel.Channel<number>
 *
 * // A channel that outputs strings, can fail with Error, completes with boolean
 * type StringChannel = Channel.Channel<string, Error, boolean>
 *
 * // A channel with all type parameters specified
 * type FullChannel = Channel.Channel<
 *   string, // OutElem - output elements
 *   Error, // OutErr - output errors
 *   number, // OutDone - completion value
 *   number, // InElem - input elements
 *   string, // InErr - input errors
 *   boolean, // InDone - input completion
 *   { db: string } // Env - required environment
 * >
 * ```
 *
 * @category models
 * @since 2.0.0
 */
export interface Channel<out OutElem, out OutErr = never, out OutDone = void, in InElem = unknown, in InErr = unknown, in InDone = unknown, out Env = never> extends Variance<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, Pipeable {
    [Unify.typeSymbol]?: unknown;
    [Unify.unifySymbol]?: ChannelUnify<this>;
    [Unify.ignoreSymbol]?: ChannelUnifyIgnore;
}
/**
 * Type-level unification support for `Channel` values.
 *
 * **Details**
 *
 * This preserves all `Channel` type parameters when `Unify` normalizes unions
 * or generic return types that include channels. Users normally do not need to
 * reference this interface directly.
 *
 * @category models
 * @since 2.0.0
 */
export interface ChannelUnify<A extends {
    [Unify.typeSymbol]?: any;
}> extends Effect.EffectUnify<A> {
    Channel?: () => A[Unify.typeSymbol] extends Channel<infer OutElem, infer OutErr, infer OutDone, infer InElem, infer InErr, infer InDone, infer Env> | infer _ ? Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env> : never;
}
/**
 * Marker used by `Unify` while resolving `Channel` values.
 *
 * **Details**
 *
 * It prevents the inherited `Effect` unifier from being selected when the
 * channel-specific unifier should preserve `Channel` input, output, and
 * environment type parameters. Users normally do not need to reference this
 * interface directly.
 *
 * @category models
 * @since 2.0.0
 */
export interface ChannelUnifyIgnore {
    Effect?: true;
}
type TagsWithReason<E> = {
    [T in Types.Tags<E>]: Types.ReasonTags<Types.ExtractTag<E, T>> extends never ? never : T;
}[Types.Tags<E>];
/**
 * Phantom variance marker for the type parameters of `Channel`.
 *
 * **Details**
 *
 * Output element, output error, output done, and environment types are
 * covariant. Input element, input error, and input done types are
 * contravariant. This is type-level machinery and is not used directly at
 * runtime.
 *
 * @category models
 * @since 2.0.0
 */
export interface Variance<out OutElem, out OutErr, out OutDone, in InElem, in InErr, in InDone, out Env> {
    readonly [TypeId]: VarianceStruct<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
}
/**
 * Structural encoding used by `Variance` to record each `Channel` type
 * parameter's variance.
 *
 * **Details**
 *
 * The `_OutElem`, `_OutErr`, `_OutDone`, and `_Env` fields are covariant; the
 * `_InElem`, `_InErr`, and `_InDone` fields are contravariant. Users normally
 * do not need to reference this interface directly.
 *
 * @category models
 * @since 2.0.0
 */
export interface VarianceStruct<out OutElem, out OutErr, out OutDone, in InElem, in InErr, in InDone, out Env> {
    _Env: Types.Covariant<Env>;
    _InErr: Types.Contravariant<InErr>;
    _InElem: Types.Contravariant<InElem>;
    _InDone: Types.Contravariant<InDone>;
    _OutErr: Types.Covariant<OutErr>;
    _OutElem: Types.Covariant<OutElem>;
    _OutDone: Types.Covariant<OutDone>;
}
/**
 * Creates a `Channel` from a transformation function that operates on upstream pulls.
 *
 * **Example** (Creating channels from transforms)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * const channel = Channel.fromTransform((upstream, scope) =>
 *   Effect.succeed(upstream)
 * )
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromTransform: <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(transform: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>) => Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>;
/**
 * Transforms a Channel by applying a function to its Pull implementation.
 *
 * **Example** (Transforming pull behavior)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * // Transform a channel by modifying its pull behavior
 * const originalChannel = Channel.fromIterable([1, 2, 3])
 *
 * const transformedChannel = Channel.transformPull(
 *   originalChannel,
 *   (pull, scope) =>
 *     Effect.succeed(
 *       Effect.map(pull, (value) => value * 2)
 *     )
 * )
 * // Outputs: 2, 4, 6
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const transformPull: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem2, OutErr2, OutDone2, Env2, OutErrX, EnvX>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (pull: Pull.Pull<OutElem, OutErr, OutDone>, scope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem2, OutErr2, OutDone2, Env2>, OutErrX, EnvX>) => Channel<OutElem2, Pull.ExcludeDone<OutErr2> | OutErrX, OutDone2, InElem, InErr, InDone, Env | Env2 | EnvX>;
/**
 * Creates a `Channel` from an `Effect` that produces a `Pull`.
 *
 * **Example** (Creating channels from pulls)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * const channel = Channel.fromPull(
 *   Effect.succeed(Effect.succeed(42))
 * )
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromPull: <OutElem, OutErr, OutDone, EX, EnvX, Env>(effect: Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>) => Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, unknown, unknown, unknown, Env | EnvX>;
/**
 * Creates a `Channel` from a transformation function that operates on upstream
 * pulls, but also provides a forked scope that closes when the resulting
 * Channel completes.
 *
 * **When to use**
 *
 * Use when building channels that require scoped resource lifecycle management,
 * providing both the channel scope and a forked scope that automatically closes
 * when the channel completes.
 *
 * @see {@link fromTransform} for a simpler transformation without a forked scope
 * @category constructors
 * @since 4.0.0
 */
export declare const fromTransformBracket: <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>) => Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>;
/**
 * Converts a `Channel` back to its underlying transformation function.
 *
 * **Example** (Extracting channel transforms)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.succeed(42)
 * const transform = Channel.toTransform(channel)
 * // transform can now be used directly
 * ```
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const toTransform: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(channel: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone>, never, Env>;
/**
 * The default chunk size used by channels for batching operations.
 *
 * **Example** (Reading the default chunk size)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * console.log(Channel.DefaultChunkSize) // 4096
 * ```
 *
 * @category constants
 * @since 4.0.0
 */
export declare const DefaultChunkSize: number;
/**
 * Creates a `Channel` that interacts with a callback function using a queue.
 *
 * **Example** (Creating channels from callbacks)
 *
 * ```ts
 * import { Channel, Effect, Queue } from "effect"
 *
 * const channel = Channel.callback<number>((queue) =>
 *   Effect.gen(function*() {
 *     yield* Queue.offer(queue, 1)
 *     yield* Queue.offer(queue, 2)
 *     yield* Queue.offer(queue, 3)
 *   })
 * )
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const callback: <A, E = never, R = never>(f: (queue: Queue.Queue<A, E | Cause.Done>) => Effect.Effect<unknown, E, R | Scope.Scope>, options?: {
    readonly bufferSize?: number | undefined;
    readonly strategy?: "sliding" | "dropping" | "suspend" | undefined;
}) => Channel<A, E, void, unknown, unknown, unknown, Exclude<R, Scope.Scope>>;
/**
 * Creates a `Channel` that interacts with a callback function using a queue, emitting arrays.
 *
 * **Example** (Creating array channels from callbacks)
 *
 * ```ts
 * import { Channel, Effect, Queue } from "effect"
 *
 * const channel = Channel.callbackArray<number>(Effect.fn(function*(queue) {
 *   yield* Queue.offer(queue, 1)
 *   yield* Queue.offer(queue, 2)
 * }))
 * // Emits arrays of numbers instead of individual numbers
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const callbackArray: <A, E = never, R = never>(f: (queue: Queue.Queue<A, E | Cause.Done>) => Effect.Effect<unknown, E, R | Scope.Scope>, options?: {
    readonly bufferSize?: number | undefined;
    readonly strategy?: "sliding" | "dropping" | "suspend" | undefined;
}) => Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, Exclude<R, Scope.Scope>>;
/**
 * Creates a `Channel` that lazily evaluates to another channel.
 *
 * **Example** (Suspending channel creation)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.suspend(() => Channel.succeed(42))
 * // The inner channel is not created until the suspended channel is run
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const suspend: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(evaluate: LazyArg<Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
/**
 * Acquires a resource, uses it to build a `Channel`, and guarantees that
 * `release` runs with the channel's `Exit` when the channel completes, fails,
 * or is interrupted.
 *
 * **Details**
 *
 * Acquisition is uninterruptible. If acquisition fails, `use` is not run and
 * `release` is not registered.
 *
 * **Example** (Managing resources with acquire-use-release)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * const channel = Channel.acquireUseRelease(
 *   Effect.succeed("resource"),
 *   (resource) => Channel.succeed(resource.toUpperCase()),
 *   (resource, exit) => Effect.log(`Released: ${resource}`)
 * )
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const acquireUseRelease: <A, E, R, OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(acquire: Effect.Effect<A, E, R>, use: (a: A) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, release: (a: A, exit: Exit.Exit<OutDone, OutErr>) => Effect.Effect<unknown>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
/**
 * Acquires a resource, emits the acquired value as a single channel element,
 * and registers `release` in the channel scope.
 *
 * **Details**
 *
 * The release action runs when the channel scope closes and receives the scope
 * exit. If acquisition fails, no element is emitted and `release` is not
 * registered.
 *
 * **Example** (Managing resources with acquire-release)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * const channel = Channel.acquireRelease(
 *   Effect.succeed("resource"),
 *   (resource, exit) => Effect.log(`Released: ${resource}`)
 * )
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const acquireRelease: {
    /**
     * Acquires a resource, emits the acquired value as a single channel element,
     * and registers `release` in the channel scope.
     *
     * **Details**
     *
     * The release action runs when the channel scope closes and receives the scope
     * exit. If acquisition fails, no element is emitted and `release` is not
     * registered.
     *
     * **Example** (Managing resources with acquire-release)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * const channel = Channel.acquireRelease(
     *   Effect.succeed("resource"),
     *   (resource, exit) => Effect.log(`Released: ${resource}`)
     * )
     * ```
     *
     * @category constructors
     * @since 4.0.0
     */
    <Z>(release: (z: Z, e: Exit.Exit<unknown, unknown>) => Effect.Effect<unknown>): <E, R>(self: Effect.Effect<Z, E, R>) => Channel<Z, E, void, unknown, unknown, unknown, R>;
    /**
     * Acquires a resource, emits the acquired value as a single channel element,
     * and registers `release` in the channel scope.
     *
     * **Details**
     *
     * The release action runs when the channel scope closes and receives the scope
     * exit. If acquisition fails, no element is emitted and `release` is not
     * registered.
     *
     * **Example** (Managing resources with acquire-release)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * const channel = Channel.acquireRelease(
     *   Effect.succeed("resource"),
     *   (resource, exit) => Effect.log(`Released: ${resource}`)
     * )
     * ```
     *
     * @category constructors
     * @since 4.0.0
     */
    <Z, E, R>(self: Effect.Effect<Z, E, R>, release: (z: Z, e: Exit.Exit<unknown, unknown>) => Effect.Effect<unknown>): Channel<Z, E, void, unknown, unknown, unknown, R>;
};
/**
 * Creates a `Channel` from an iterator.
 *
 * **Example** (Creating channels from iterators)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const numbers = [1, 2, 3, 4, 5]
 * const channel = Channel.fromIterator(() => numbers[Symbol.iterator]())
 * // Emits: 1, 2, 3, 4, 5
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromIterator: <A, L>(iterator: LazyArg<Iterator<A, L>>) => Channel<A, never, L>;
/**
 * Creates a `Channel` that emits all elements from an array.
 *
 * **Example** (Creating channels from arrays)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.fromArray([1, 2, 3, 4, 5])
 * // Emits: 1, 2, 3, 4, 5
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromArray: <A>(array: ReadonlyArray<A>) => Channel<A>;
/**
 * Creates a `Channel` that emits all elements from a chunk.
 *
 * **Example** (Creating channels from chunks)
 *
 * ```ts
 * import { Channel, Chunk } from "effect"
 *
 * const chunk = Chunk.make(1, 2, 3)
 * const channel = Channel.fromChunk(chunk)
 * // Emits: 1, 2, 3
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromChunk: <A>(chunk: Chunk.Chunk<A>) => Channel<A>;
/**
 * Creates a `Channel` from an iterator that emits arrays of elements.
 *
 * **Example** (Batching iterator output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel from a simple iterator
 * const numberIterator = (): Iterator<number, string> => {
 *   let count = 0
 *   return {
 *     next: () => {
 *       if (count < 3) {
 *         return { value: count++, done: false }
 *       }
 *       return { value: "finished", done: true }
 *     }
 *   }
 * }
 *
 * const channel = Channel.fromIteratorArray(() => numberIterator(), 2)
 * // This will emit arrays: [0, 1], [2], then complete with "finished"
 * ```
 *
 * **Example** (Batching generator output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create channel from a generator function
 * function* fibonacci(): Generator<number, void, unknown> {
 *   let a = 0, b = 1
 *   for (let i = 0; i < 5; i++) {
 *     yield a
 *     ;[a, b] = [b, a + b]
 *   }
 * }
 *
 * const fibChannel = Channel.fromIteratorArray(() => fibonacci(), 3)
 * // Emits: [0, 1, 1], [2, 3], then completes
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromIteratorArray: <A, L>(iterator: LazyArg<Iterator<A, L>>, chunkSize?: number) => Channel<Arr.NonEmptyReadonlyArray<A>, never, L>;
/**
 * Creates a `Channel` that emits all elements from an iterable.
 *
 * **Example** (Creating channels from iterables)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const set = new Set([1, 2, 3])
 * const channel = Channel.fromIterable(set)
 * // Emits: 1, 2, 3
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromIterable: <A, L>(iterable: Iterable<A, L>) => Channel<A, never, L>;
/**
 * Creates a `Channel` that emits arrays of elements from an iterable.
 *
 * **Example** (Batching iterable output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const numbers = [1, 2, 3, 4, 5]
 * const channel = Channel.fromIterableArray(numbers)
 * // Emits arrays like: [1, 2, 3, 4], [5] (based on chunk size)
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromIterableArray: <A, L>(iterable: Iterable<A, L>, chunkSize?: number) => Channel<Arr.NonEmptyReadonlyArray<A>, never, L>;
/**
 * Creates a `Channel` that emits a single value and then ends.
 *
 * **Example** (Creating channels that succeed)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.succeed(42)
 * // Emits: 42
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const succeed: <A>(value: A) => Channel<A>;
/**
 * Creates a `Channel` that immediately ends with the specified value.
 *
 * **Example** (Ending with a value)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * const channel = Channel.end("done")
 * // Ends immediately with "done", emits nothing
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const end: <A>(value: A) => Channel<never, never, A>;
/**
 * Creates a `Channel` that immediately ends with the lazily evaluated value.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const endSync: <A>(evaluate: LazyArg<A>) => Channel<never, never, A>;
/**
 * Creates a `Channel` that emits a single value computed by a lazy evaluation.
 *
 * **Example** (Computing values lazily)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * let requests = 0
 *
 * const channel = Channel.sync(() => {
 *   requests += 1
 *   return `request-${requests}`
 * })
 * // Emits "request-1" when the channel runs for the first time
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const sync: <A>(evaluate: LazyArg<A>) => Channel<A>;
/**
 * Represents a `Channel` that emits no elements.
 *
 * **Example** (Using empty channels)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create an empty channel
 * const emptyChannel = Channel.empty
 *
 * // Use empty channel in composition
 * const combined = Channel.concatWith(emptyChannel, () => Channel.succeed(42))
 * // Will immediately provide the second channel's output
 *
 * // Empty channel can be used as a no-op in conditional logic
 * const conditionalChannel = (shouldEmit: boolean) =>
 *   shouldEmit ? Channel.succeed("data") : Channel.empty
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const empty: Channel<never>;
/**
 * Represents a `Channel` that never completes.
 *
 * **Example** (Using non-terminating channels)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel that never completes
 * const neverChannel = Channel.never
 *
 * // Use in conditional logic
 * const withFallback = Channel.concatWith(
 *   neverChannel,
 *   () => Channel.succeed("fallback")
 * )
 *
 * // Never channel is useful for testing or as a placeholder
 * const conditionalChannel = (shouldComplete: boolean) =>
 *   shouldComplete ? Channel.succeed("done") : Channel.never
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const never: Channel<never, never, never>;
/**
 * Constructs a channel that fails immediately with the specified error.
 *
 * **Example** (Failing with an error)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel that fails with a string error
 * const failedChannel = Channel.fail("Something went wrong")
 *
 * // Create a channel that fails with a custom error
 * class CustomError extends Error {
 *   constructor(message: string) {
 *     super(message)
 *     this.name = "CustomError"
 *   }
 * }
 * const customErrorChannel = Channel.fail(new CustomError("Custom error"))
 *
 * // Use in error handling by piping to another channel
 * const channelWithFallback = Channel.concatWith(
 *   failedChannel,
 *   () => Channel.succeed("fallback value")
 * )
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const fail: <E>(error: E) => Channel<never, E, never>;
/**
 * Constructs a channel that fails immediately with the specified lazily
 * evaluated error.
 *
 * **When to use**
 *
 * Use when the error value should be computed each time the channel runs instead
 * of when the channel is constructed.
 *
 * **Example** (Failing with a lazy error)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel that fails with a lazily computed error
 * const failedChannel = Channel.failSync(() => {
 *   console.log("Computing error...")
 *   return new Error("Computed at runtime")
 * })
 *
 * // The error computation is deferred until the channel runs
 * let attempts = 0
 * const conditionalError = Channel.failSync(() => {
 *   attempts += 1
 *   return `Error after attempt ${attempts}`
 * })
 *
 * // Use with expensive error construction
 * const expensiveError = Channel.failSync(() => {
 *   const requestId = "request-123"
 *   return new Error(`Failed while processing ${requestId}`)
 * })
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const failSync: <E>(evaluate: LazyArg<E>) => Channel<never, E, never>;
/**
 * Constructs a channel that fails immediately with the specified `Cause`.
 *
 * **When to use**
 *
 * Use when the channel failure must preserve a full `Cause`, such as defects,
 * interruptions, or combined failures.
 *
 * **Example** (Failing with causes)
 *
 * ```ts
 * import { Cause, Channel } from "effect"
 *
 * // Create a channel that fails with a simple cause
 * const simpleCause = Cause.fail("Simple error")
 * const failedChannel = Channel.failCause(simpleCause)
 *
 * // Create a channel with a die cause
 * const dieCause = Cause.die(new Error("System error"))
 * const dieFailure = Channel.failCause(dieCause)
 *
 * // Create a channel with a simple fail cause
 * const failCause = Cause.fail("Simple error")
 * const simpleFail = Channel.failCause(failCause)
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const failCause: <E>(cause: Cause.Cause<E>) => Channel<never, E, never>;
/**
 * Constructs a channel that fails immediately with the specified lazily
 * evaluated `Cause`.
 *
 * **Example** (Failing with lazy causes)
 *
 * ```ts
 * import { Cause, Channel } from "effect"
 *
 * // Create a channel that fails with a lazily computed cause
 * let attempts = 0
 * const failedChannel = Channel.failCauseSync(() => {
 *   attempts += 1
 *   return Cause.fail(`Runtime error after attempt ${attempts}`)
 * })
 *
 * // Create a channel with die cause computation
 * const dieCauseChannel = Channel.failCauseSync(() => {
 *   const operation = "load-profile"
 *   return Cause.die(`Unexpected defect during ${operation}`)
 * })
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const failCauseSync: <E>(evaluate: LazyArg<Cause.Cause<E>>) => Channel<never, E, never>;
/**
 * Constructs a channel that fails immediately with the specified defect.
 *
 * **Example** (Dying with defects)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel that dies with a string defect
 * const diedChannel = Channel.die("Unrecoverable error")
 *
 * // Create a channel that dies with an Error object
 * const errorDefect = Channel.die(new Error("System failure"))
 *
 * // Die with any value as a defect
 * const objectDefect = Channel.die({
 *   code: "SYSTEM_FAILURE",
 *   details: "Critical system component failed"
 * })
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const die: (defect: unknown) => Channel<never, never, never>;
/**
 * Uses an effect to write a single value to the channel.
 *
 * **Example** (Creating channels from effects)
 *
 * ```ts
 * import { Channel, Data, Effect } from "effect"
 *
 * class DatabaseError extends Data.TaggedError("DatabaseError")<{
 *   readonly message: string
 * }> {}
 *
 * // Create a channel from a successful effect
 * const successChannel = Channel.fromEffect(
 *   Effect.succeed("Hello from effect!")
 * )
 *
 * // Create a channel from an effect that might fail
 * const fetchUserChannel = Channel.fromEffect(
 *   Effect.tryPromise({
 *     try: () => fetch("/api/user").then((res) => res.json()),
 *     catch: (error) => new DatabaseError({ message: String(error) })
 *   })
 * )
 *
 * // Channel from effect with async computation
 * const asyncChannel = Channel.fromEffect(
 *   Effect.gen(function*() {
 *     yield* Effect.sleep("100 millis")
 *     return "Async result"
 *   })
 * )
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const fromEffect: <A, E, R>(effect: Effect.Effect<A, E, R>) => Channel<A, Pull.ExcludeDone<E>, void, unknown, unknown, unknown, R>;
/**
 * Creates a channel that evaluates an effect and uses its successful value as
 * the channel's done value without emitting any output elements.
 *
 * **Details**
 *
 * If the effect fails, the channel fails with the effect's error.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromEffectDone: <A, E, R>(effect: Effect.Effect<A, E, R>) => Channel<never, Pull.ExcludeDone<E>, A, unknown, unknown, unknown, R>;
/**
 * Uses an effect and discards its result.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromEffectDrain: <A, E, R>(effect: Effect.Effect<A, E, R>) => Channel<never, E, void, unknown, unknown, unknown, R>;
/**
 * Creates a channel from an effect that produces a `Take`.
 *
 * **Details**
 *
 * A successful `Take` emits a non-empty array of output elements. A failed
 * `Take` fails the channel. A done `Take` completes the channel with its done
 * value.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromEffectTake: <A, E, Done, E2, R>(effect: Effect.Effect<Take.Take<A, E, Done>, E2, R>) => Channel<Arr.NonEmptyReadonlyArray<A>, E | E2, Done, unknown, unknown, unknown, R>;
/**
 * Creates a channel from a queue.
 *
 * **Example** (Creating channels from queues)
 *
 * ```ts
 * import { Channel, Data, Effect, Queue } from "effect"
 *
 * class QueueError extends Data.TaggedError("QueueError")<{
 *   readonly reason: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   // Create a bounded queue
 *   const queue = yield* Queue.bounded<string, QueueError>(10)
 *
 *   // Add some items to the queue
 *   yield* Queue.offer(queue, "item1")
 *   yield* Queue.offer(queue, "item2")
 *   yield* Queue.offer(queue, "item3")
 *
 *   // Create a channel from the queue
 *   const channel = Channel.fromQueue(queue)
 *
 *   // The channel will read items from the queue one by one
 *   return channel
 * })
 *
 * // Sliding queue example
 * const slidingProgram = Effect.gen(function*() {
 *   const slidingQueue = yield* Queue.sliding<number, QueueError>(5)
 *   yield* Queue.offerAll(slidingQueue, [1, 2, 3, 4, 5, 6])
 *   return Channel.fromQueue(slidingQueue)
 * })
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const fromQueue: <A, E>(queue: Queue.Dequeue<A, E>) => Channel<A, Exclude<E, Cause.Done>>;
/**
 * Creates a channel from a queue that emits arrays of elements.
 *
 * **Example** (Creating batched channels from queues)
 *
 * ```ts
 * import { Channel, Data, Effect, Queue } from "effect"
 *
 * class ProcessingError extends Data.TaggedError("ProcessingError")<{
 *   readonly stage: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   // Create a queue for batch processing
 *   const queue = yield* Queue.bounded<number, ProcessingError>(100)
 *
 *   // Fill queue with data
 *   yield* Queue.offerAll(queue, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
 *
 *   // Create a channel that reads arrays from the queue
 *   const arrayChannel = Channel.fromQueueArray(queue)
 *
 *   // This will emit non-empty arrays of elements instead of individual items
 *   // Useful for batch processing scenarios
 *   return arrayChannel
 * })
 *
 * // High-throughput processing example
 * const batchProcessor = Effect.gen(function*() {
 *   const dataQueue = yield* Queue.dropping<string, ProcessingError>(1000)
 *   const batchChannel = Channel.fromQueueArray(dataQueue)
 *
 *   // Process data in batches for better performance
 *   return Channel.map(
 *     batchChannel,
 *     (batch) => batch.map((item) => item.toUpperCase())
 *   )
 * })
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromQueueArray: <A, E>(queue: Queue.Dequeue<A, E>) => Channel<Arr.NonEmptyReadonlyArray<A>, Exclude<E, Cause.Done>>;
/**
 * Creates a channel that forwards upstream input elements, input errors, and
 * the upstream done value unchanged.
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const identity: <Elem, Err, Done>() => Channel<Elem, Err, Done, Elem, Err, Done>;
/**
 * Creates a channel from a PubSub subscription.
 *
 * **Example** (Creating channels from subscriptions)
 *
 * ```ts
 * import { Channel, Data, Effect, PubSub } from "effect"
 *
 * class SubscriptionError extends Data.TaggedError("SubscriptionError")<{
 *   readonly reason: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   // Create a PubSub
 *   const pubsub = yield* PubSub.bounded<string>(32)
 *
 *   // Create a subscription
 *   const subscription = yield* PubSub.subscribe(pubsub)
 *
 *   // Publish some messages
 *   yield* PubSub.publish(pubsub, "Hello")
 *   yield* PubSub.publish(pubsub, "World")
 *   yield* PubSub.publish(pubsub, "from")
 *   yield* PubSub.publish(pubsub, "PubSub")
 *
 *   // Create a channel from the subscription
 *   const channel = Channel.fromSubscription(subscription)
 *
 *   // The channel will receive all published messages
 *   return channel
 * })
 *
 * // Real-time notifications example
 * const notificationChannel = Effect.gen(function*() {
 *   const eventBus = yield* PubSub.unbounded<{ type: string; payload: any }>()
 *   const userSubscription = yield* PubSub.subscribe(eventBus)
 *
 *   return Channel.fromSubscription(userSubscription)
 * })
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromSubscription: <A>(subscription: PubSub.Subscription<A>) => Channel<A>;
/**
 * Creates a channel from a PubSub subscription that outputs arrays of values.
 *
 * **Details**
 *
 * This constructor creates a channel that reads from a PubSub subscription and outputs
 * arrays of values in chunks. It's useful when you want to process multiple values at once
 * for better performance.
 *
 * **Example** (Batching subscription values)
 *
 * ```ts
 * import { Channel, Data, Effect, PubSub } from "effect"
 *
 * class StreamError extends Data.TaggedError("StreamError")<{
 *   readonly message: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   const pubsub = yield* PubSub.bounded<number>(16)
 *   const subscription = yield* PubSub.subscribe(pubsub)
 *
 *   // Create a channel that reads arrays of values
 *   const channel = Channel.fromSubscriptionArray(subscription)
 *
 *   // Publish some values
 *   yield* PubSub.publish(pubsub, 1)
 *   yield* PubSub.publish(pubsub, 2)
 *   yield* PubSub.publish(pubsub, 3)
 *   yield* PubSub.publish(pubsub, 4)
 *
 *   // The channel will output arrays like [1, 2, 3] and [4]
 *   return channel
 * })
 * ```
 *
 * **Example** (Processing subscription values in batches)
 *
 * ```ts
 * import { Channel, Data, Effect, PubSub } from "effect"
 *
 * class BatchProcessingError extends Data.TaggedError("BatchProcessingError")<{
 *   readonly reason: string
 * }> {}
 *
 * const batchProcessor = Effect.gen(function*() {
 *   const pubsub = yield* PubSub.bounded<string>(32)
 *   const subscription = yield* PubSub.subscribe(pubsub)
 *
 *   // Create a channel that processes items in batches
 *   const batchChannel = Channel.fromSubscriptionArray(subscription)
 *
 *   // Transform to process each batch
 *   const processedChannel = Channel.map(batchChannel, (batch) => {
 *     console.log(`Processing batch of ${batch.length} items:`, batch)
 *     return batch.map((item) => item.toUpperCase())
 *   })
 *
 *   return processedChannel
 * })
 * ```
 *
 * **Example** (Aggregating subscription metrics)
 *
 * ```ts
 * import { Channel, Effect, PubSub } from "effect"
 *
 * const metricsAggregator = Effect.gen(function*() {
 *   const metricsPubSub = yield* PubSub.bounded<
 *     { timestamp: number; value: number }
 *   >(100)
 *   const subscription = yield* PubSub.subscribe(metricsPubSub)
 *
 *   // Create a channel that collects metrics in chunks
 *   const metricsChannel = Channel.fromSubscriptionArray(subscription)
 *
 *   // Transform to calculate aggregate statistics
 *   const aggregatedChannel = Channel.map(metricsChannel, (metrics) => {
 *     const values = metrics.map((m) => m.value)
 *     const sum = values.reduce((a, b) => a + b, 0)
 *     const avg = sum / values.length
 *     const min = Math.min(...values)
 *     const max = Math.max(...values)
 *
 *     return {
 *       count: values.length,
 *       sum,
 *       average: avg,
 *       min,
 *       max,
 *       firstTimestamp: Math.min(...metrics.map((m) => m.timestamp)),
 *       lastTimestamp: Math.max(...metrics.map((m) => m.timestamp))
 *     }
 *   })
 *
 *   return aggregatedChannel
 * })
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromSubscriptionArray: <A>(subscription: PubSub.Subscription<A>) => Channel<Arr.NonEmptyReadonlyArray<A>>;
/**
 * Creates a channel from a PubSub that outputs individual values.
 *
 * **Details**
 *
 * This constructor creates a channel that reads from a PubSub by automatically
 * subscribing to it. The channel outputs individual values as they are published
 * to the PubSub, making it ideal for real-time streaming scenarios.
 *
 * **Example** (Creating channels from PubSubs)
 *
 * ```ts
 * import { Channel, Data, Effect, PubSub } from "effect"
 *
 * class StreamError extends Data.TaggedError("StreamError")<{
 *   readonly message: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   const pubsub = yield* PubSub.bounded<number>(16)
 *
 *   // Create a channel that reads individual values
 *   const channel = Channel.fromPubSub(pubsub)
 *
 *   // Publish some values
 *   yield* PubSub.publish(pubsub, 1)
 *   yield* PubSub.publish(pubsub, 2)
 *   yield* PubSub.publish(pubsub, 3)
 *
 *   // The channel will output: 1, 2, 3 (individual values)
 *   return channel
 * })
 * ```
 *
 * **Example** (Streaming PubSub notifications)
 *
 * ```ts
 * import { Channel, Effect, PubSub } from "effect"
 *
 * const notificationService = Effect.gen(function*() {
 *   const notificationPubSub = yield* PubSub.bounded<string>(50)
 *
 *   // Create a channel for real-time notifications
 *   const notificationChannel = Channel.fromPubSub(notificationPubSub)
 *
 *   // Transform notifications to add timestamps
 *   const receivedAt = "2024-01-01T00:00:00.000Z"
 *   const timestampedChannel = Channel.map(notificationChannel, (message) => ({
 *     message,
 *     receivedAt,
 *     id: `notification:${message}`
 *   }))
 *
 *   return timestampedChannel
 * })
 * ```
 *
 * **Example** (Processing PubSub events)
 *
 * ```ts
 * import { Channel, Effect, PubSub } from "effect"
 *
 * interface DomainEvent {
 *   readonly type: string
 *   readonly payload: unknown
 *   readonly timestamp: number
 * }
 *
 * const eventProcessor = Effect.gen(function*() {
 *   const eventPubSub = yield* PubSub.bounded<DomainEvent>(100)
 *
 *   // Create a channel for processing domain events
 *   const eventChannel = Channel.fromPubSub(eventPubSub)
 *
 *   // Filter and transform events
 *   const processedChannel = Channel.map(eventChannel, (event) => {
 *     if (event.type === "user.created") {
 *       return {
 *         ...event,
 *         processed: true,
 *         processedAt: event.timestamp + 1
 *       }
 *     }
 *     return event
 *   })
 *
 *   return processedChannel
 * })
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const fromPubSub: <A>(pubsub: PubSub.PubSub<A>) => Channel<A>;
/**
 * Creates a channel from a PubSub that outputs arrays of values.
 *
 * **Details**
 *
 * This constructor creates a channel that reads from a PubSub by automatically
 * subscribing to it and collecting values into arrays. The channel outputs
 * arrays of values in chunks, making it ideal for batch processing scenarios.
 *
 * **Example** (Batching PubSub values)
 *
 * ```ts
 * import { Channel, Data, Effect, PubSub } from "effect"
 *
 * class BatchError extends Data.TaggedError("BatchError")<{
 *   readonly message: string
 * }> {}
 *
 * const program = Effect.gen(function*() {
 *   const pubsub = yield* PubSub.bounded<number>(16)
 *
 *   // Create a channel that reads arrays of values
 *   const channel = Channel.fromPubSubArray(pubsub)
 *
 *   // Publish some values
 *   yield* PubSub.publish(pubsub, 1)
 *   yield* PubSub.publish(pubsub, 2)
 *   yield* PubSub.publish(pubsub, 3)
 *   yield* PubSub.publish(pubsub, 4)
 *
 *   // The channel will output arrays like [1, 2, 3] and [4]
 *   return channel
 * })
 * ```
 *
 * **Example** (Processing PubSub orders in batches)
 *
 * ```ts
 * import { Channel, Effect, PubSub } from "effect"
 *
 * interface Order {
 *   readonly id: string
 *   readonly customerId: string
 *   readonly items: ReadonlyArray<string>
 *   readonly total: number
 *   readonly submittedAt: number
 * }
 *
 * const orderBatchProcessor = Effect.gen(function*() {
 *   const orderPubSub = yield* PubSub.bounded<Order>(100)
 *
 *   // Create a channel that processes orders in batches
 *   const orderChannel = Channel.fromPubSubArray(orderPubSub)
 *
 *   // Transform to process each batch of orders
 *   const processedChannel = Channel.map(orderChannel, (orderBatch) => {
 *     const totalRevenue = orderBatch.reduce((sum, order) => sum + order.total, 0)
 *     const customerCount = new Set(orderBatch.map((order) =>
 *       order.customerId
 *     )).size
 *
 *     return {
 *       batchSize: orderBatch.length,
 *       totalRevenue,
 *       uniqueCustomers: customerCount,
 *       firstSubmittedAt: Math.min(...orderBatch.map((order) => order.submittedAt)),
 *       orders: orderBatch
 *     }
 *   })
 *
 *   return processedChannel
 * })
 * ```
 *
 * **Example** (Processing PubSub logs in batches)
 *
 * ```ts
 * import { Channel, Effect, PubSub } from "effect"
 *
 * interface LogEntry {
 *   readonly timestamp: number
 *   readonly level: "info" | "warn" | "error"
 *   readonly message: string
 *   readonly source: string
 * }
 *
 * const logAggregator = Effect.gen(function*() {
 *   const logPubSub = yield* PubSub.bounded<LogEntry>(500)
 *
 *   // Create a channel that collects logs in batches
 *   const logChannel = Channel.fromPubSubArray(logPubSub)
 *
 *   // Transform to analyze log batches
 *   const analysisChannel = Channel.map(logChannel, (logBatch) => {
 *     const errorCount = logBatch.filter((log) => log.level === "error").length
 *     const warnCount = logBatch.filter((log) => log.level === "warn").length
 *     const infoCount = logBatch.filter((log) => log.level === "info").length
 *
 *     const timeRange = {
 *       start: Math.min(...logBatch.map((log) => log.timestamp)),
 *       end: Math.max(...logBatch.map((log) => log.timestamp))
 *     }
 *
 *     return {
 *       batchId: `${timeRange.start}-${timeRange.end}`,
 *       totalEntries: logBatch.length,
 *       errorCount,
 *       warnCount,
 *       infoCount,
 *       timeRange,
 *       sources: [...new Set(logBatch.map((log) => log.source))]
 *     }
 *   })
 *
 *   return analysisChannel
 * })
 * ```
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromPubSubArray: <A>(pubsub: PubSub.PubSub<A>) => Channel<Arr.NonEmptyReadonlyArray<A>>;
/**
 * Subscribes to a `PubSub` of `Take` values and exposes them as a channel.
 *
 * **Details**
 *
 * Output `Take` values are emitted as non-empty arrays. Failed `Take` values
 * fail the channel. Done `Take` values complete the channel.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromPubSubTake: <A, E, Done>(pubsub: PubSub.PubSub<Take.Take<A, E, Done>>) => Channel<Arr.NonEmptyReadonlyArray<A>, E, Done>;
/**
 * Creates a Channel from a Schedule.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromSchedule: <O, E, R>(schedule: Schedule.Schedule<O, unknown, E, R>) => Channel<O, E, O, unknown, unknown, unknown, R>;
/**
 * Creates a channel that pulls values from an `AsyncIterable`.
 *
 * **Details**
 *
 * Each yielded value is emitted as an output element. The iterator's return
 * value becomes the channel's done value. Thrown or rejected iterator errors
 * are converted with `onError`. If the channel scope closes early and the
 * iterator has a `return` method, that method is called.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromAsyncIterable: <A, D, E>(iterable: AsyncIterable<A, D>, onError: (error: unknown) => E) => Channel<A, E, D>;
/**
 * Creates a channel from an `AsyncIterable`, emitting each yielded value as a
 * single-element non-empty array.
 *
 * **Details**
 *
 * The iterator's return value becomes the channel's done value. Thrown or
 * rejected iterator errors are converted with `onError`. If the channel scope
 * closes early and the iterator has a `return` method, that method is called.
 *
 * @category constructors
 * @since 4.0.0
 */
export declare const fromAsyncIterableArray: <A, D, E>(iterable: AsyncIterable<A, D>, onError: (error: unknown) => E) => Channel<Arr.NonEmptyReadonlyArray<A>, E, D>;
/**
 * Maps the output of this channel using the specified function.
 *
 * **Example** (Mapping channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class TransformError extends Data.TaggedError("TransformError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Basic mapping of channel values
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 * const doubledChannel = Channel.map(numbersChannel, (n) => n * 2)
 * // Outputs: 2, 4, 6, 8, 10
 *
 * // Transform string data
 * const wordsChannel = Channel.fromIterable(["hello", "world", "effect"])
 * const upperCaseChannel = Channel.map(wordsChannel, (word) => word.toUpperCase())
 * // Outputs: "HELLO", "WORLD", "EFFECT"
 *
 * // Complex object transformation
 * type User = { id: number; name: string }
 * type UserDisplay = { displayName: string; isActive: boolean }
 *
 * const usersChannel = Channel.fromIterable([
 *   { id: 1, name: "Alice" },
 *   { id: 2, name: "Bob" }
 * ])
 * const displayChannel = Channel.map(usersChannel, (user): UserDisplay => ({
 *   displayName: `User: ${user.name}`,
 *   isActive: true
 * }))
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const map: {
    /**
     * Maps the output of this channel using the specified function.
     *
     * **Example** (Mapping channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class TransformError extends Data.TaggedError("TransformError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Basic mapping of channel values
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     * const doubledChannel = Channel.map(numbersChannel, (n) => n * 2)
     * // Outputs: 2, 4, 6, 8, 10
     *
     * // Transform string data
     * const wordsChannel = Channel.fromIterable(["hello", "world", "effect"])
     * const upperCaseChannel = Channel.map(wordsChannel, (word) => word.toUpperCase())
     * // Outputs: "HELLO", "WORLD", "EFFECT"
     *
     * // Complex object transformation
     * type User = { id: number; name: string }
     * type UserDisplay = { displayName: string; isActive: boolean }
     *
     * const usersChannel = Channel.fromIterable([
     *   { id: 1, name: "Alice" },
     *   { id: 2, name: "Bob" }
     * ])
     * const displayChannel = Channel.map(usersChannel, (user): UserDisplay => ({
     *   displayName: `User: ${user.name}`,
     *   isActive: true
     * }))
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutElem2>(f: (o: OutElem, i: number) => OutElem2): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem2, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Maps the output of this channel using the specified function.
     *
     * **Example** (Mapping channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class TransformError extends Data.TaggedError("TransformError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Basic mapping of channel values
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     * const doubledChannel = Channel.map(numbersChannel, (n) => n * 2)
     * // Outputs: 2, 4, 6, 8, 10
     *
     * // Transform string data
     * const wordsChannel = Channel.fromIterable(["hello", "world", "effect"])
     * const upperCaseChannel = Channel.map(wordsChannel, (word) => word.toUpperCase())
     * // Outputs: "HELLO", "WORLD", "EFFECT"
     *
     * // Complex object transformation
     * type User = { id: number; name: string }
     * type UserDisplay = { displayName: string; isActive: boolean }
     *
     * const usersChannel = Channel.fromIterable([
     *   { id: 1, name: "Alice" },
     *   { id: 2, name: "Bob" }
     * ])
     * const displayChannel = Channel.map(usersChannel, (user): UserDisplay => ({
     *   displayName: `User: ${user.name}`,
     *   isActive: true
     * }))
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (o: OutElem, i: number) => OutElem2): Channel<OutElem2, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Maps the done value of this channel using the specified function.
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const mapDone: {
    /**
     * Maps the done value of this channel using the specified function.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutDone, OutDone2>(f: (o: OutDone) => OutDone2): <OutElem, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone2, InElem, InErr, InDone, Env>;
    /**
     * Maps the done value of this channel using the specified function.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutDone2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (o: OutDone) => OutDone2): Channel<OutElem, OutErr, OutDone2, InElem, InErr, InDone, Env>;
};
/**
 * Maps the done value of this channel using the specified effectful function.
 *
 * **When to use**
 *
 * Use when the terminal done value transformation needs services or can fail,
 * while emitted elements should pass through unchanged.
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const mapDoneEffect: {
    /**
     * Maps the done value of this channel using the specified effectful function.
     *
     * **When to use**
     *
     * Use when the terminal done value transformation needs services or can fail,
     * while emitted elements should pass through unchanged.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutDone, OutDone2, E, R>(f: (o: OutDone) => Effect.Effect<OutDone2, E, R>): <OutElem, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone2, InElem, InErr, InDone, Env | R>;
    /**
     * Maps the done value of this channel using the specified effectful function.
     *
     * **When to use**
     *
     * Use when the terminal done value transformation needs services or can fail,
     * while emitted elements should pass through unchanged.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutDone2, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (o: OutDone) => Effect.Effect<OutDone2, E, R>): Channel<OutElem, OutErr | E, OutDone2, InElem, InErr, InDone, Env | R>;
};
/**
 * Maps each output element with an effectful function, preserving the source
 * channel's done value.
 *
 * **When to use**
 *
 * Use when transforming each channel output needs an Effect, service
 * dependency, failure channel, or configured concurrency.
 *
 * **Details**
 *
 * The mapping function receives the output element and its zero-based index.
 * By default elements are mapped sequentially. Use `options.concurrency` to
 * map multiple elements concurrently, and `options.unordered` to allow
 * concurrently mapped outputs to be emitted as soon as they complete.
 *
 * **Example** (Mapping channel output with effects)
 *
 * ```ts
 * import { Channel, Data, Effect } from "effect"
 *
 * class NetworkError extends Data.TaggedError("NetworkError")<{
 *   readonly url: string
 * }> {}
 *
 * // Transform values using effectful operations
 * const urlsChannel = Channel.fromIterable([
 *   "/api/users/1",
 *   "/api/users/2",
 *   "/api/users/3"
 * ])
 *
 * const fetchDataChannel = Channel.mapEffect(
 *   urlsChannel,
 *   (url) =>
 *     Effect.tryPromise({
 *       try: () => fetch(url).then((res) => res.json()),
 *       catch: () => new NetworkError({ url })
 *     })
 * )
 *
 * // Concurrent processing with options
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 * const processedChannel = Channel.mapEffect(
 *   numbersChannel,
 *   (n) =>
 *     Effect.gen(function*() {
 *       yield* Effect.sleep("100 millis") // Simulate async work
 *       return n * n
 *     }),
 *   { concurrency: 3, unordered: true }
 * )
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const mapEffect: {
    /**
     * Maps each output element with an effectful function, preserving the source
     * channel's done value.
     *
     * **When to use**
     *
     * Use when transforming each channel output needs an Effect, service
     * dependency, failure channel, or configured concurrency.
     *
     * **Details**
     *
     * The mapping function receives the output element and its zero-based index.
     * By default elements are mapped sequentially. Use `options.concurrency` to
     * map multiple elements concurrently, and `options.unordered` to allow
     * concurrently mapped outputs to be emitted as soon as they complete.
     *
     * **Example** (Mapping channel output with effects)
     *
     * ```ts
     * import { Channel, Data, Effect } from "effect"
     *
     * class NetworkError extends Data.TaggedError("NetworkError")<{
     *   readonly url: string
     * }> {}
     *
     * // Transform values using effectful operations
     * const urlsChannel = Channel.fromIterable([
     *   "/api/users/1",
     *   "/api/users/2",
     *   "/api/users/3"
     * ])
     *
     * const fetchDataChannel = Channel.mapEffect(
     *   urlsChannel,
     *   (url) =>
     *     Effect.tryPromise({
     *       try: () => fetch(url).then((res) => res.json()),
     *       catch: () => new NetworkError({ url })
     *     })
     * )
     *
     * // Concurrent processing with options
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     * const processedChannel = Channel.mapEffect(
     *   numbersChannel,
     *   (n) =>
     *     Effect.gen(function*() {
     *       yield* Effect.sleep("100 millis") // Simulate async work
     *       return n * n
     *     }),
     *   { concurrency: 3, unordered: true }
     * )
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutElem1, OutErr1, Env1>(f: (d: OutElem, i: number) => Effect.Effect<OutElem1, OutErr1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly unordered?: boolean | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem1, OutErr1 | OutErr, OutDone, InElem, InErr, InDone, Env1 | Env>;
    /**
     * Maps each output element with an effectful function, preserving the source
     * channel's done value.
     *
     * **When to use**
     *
     * Use when transforming each channel output needs an Effect, service
     * dependency, failure channel, or configured concurrency.
     *
     * **Details**
     *
     * The mapping function receives the output element and its zero-based index.
     * By default elements are mapped sequentially. Use `options.concurrency` to
     * map multiple elements concurrently, and `options.unordered` to allow
     * concurrently mapped outputs to be emitted as soon as they complete.
     *
     * **Example** (Mapping channel output with effects)
     *
     * ```ts
     * import { Channel, Data, Effect } from "effect"
     *
     * class NetworkError extends Data.TaggedError("NetworkError")<{
     *   readonly url: string
     * }> {}
     *
     * // Transform values using effectful operations
     * const urlsChannel = Channel.fromIterable([
     *   "/api/users/1",
     *   "/api/users/2",
     *   "/api/users/3"
     * ])
     *
     * const fetchDataChannel = Channel.mapEffect(
     *   urlsChannel,
     *   (url) =>
     *     Effect.tryPromise({
     *       try: () => fetch(url).then((res) => res.json()),
     *       catch: () => new NetworkError({ url })
     *     })
     * )
     *
     * // Concurrent processing with options
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     * const processedChannel = Channel.mapEffect(
     *   numbersChannel,
     *   (n) =>
     *     Effect.gen(function*() {
     *       yield* Effect.sleep("100 millis") // Simulate async work
     *       return n * n
     *     }),
     *   { concurrency: 3, unordered: true }
     * )
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: OutElem, i: number) => Effect.Effect<OutElem1, OutErr1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly unordered?: boolean | undefined;
    }): Channel<OutElem1, OutErr | OutErr1, OutDone, InElem, InErr, InDone, Env | Env1>;
};
/**
 * Returns a new channel which is the same as this one but applies the given
 * function to the input channel’s input elements.
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const mapInput: {
    /**
     * Returns a new channel which is the same as this one but applies the given
     * function to the input channel’s input elements.
     *
     * @category sequencing
     * @since 2.0.0
     */
    <InElem, InElem2, InErr, R = never>(f: (i: InElem2) => Effect.Effect<InElem, InErr, R>): <OutElem, OutErr, OutDone, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env | R>) => Channel<OutElem, OutErr, OutDone, InElem2, InErr, InDone, Env>;
    /**
     * Returns a new channel which is the same as this one but applies the given
     * function to the input channel’s input elements.
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, InElem2, R = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (i: InElem2) => Effect.Effect<InElem, InErr, R>): Channel<OutElem, OutErr, OutDone, InElem2, InErr, InDone, Env | R>;
};
/**
 * Returns a new channel which is the same as this one but applies the given
 * function to the input errors.
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const mapInputError: {
    /**
     * Returns a new channel which is the same as this one but applies the given
     * function to the input errors.
     *
     * @category sequencing
     * @since 2.0.0
     */
    <InErr, InErr2, R = never>(f: (i: InErr2) => Effect.Effect<InErr, InErr, R>): <OutElem, OutErr, OutDone, InElem, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env | R>) => Channel<OutElem, OutErr, OutDone, InElem, InErr2, InDone, Env>;
    /**
     * Returns a new channel which is the same as this one but applies the given
     * function to the input errors.
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, InErr2, R = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (i: InErr2) => Effect.Effect<InErr, InErr, R>): Channel<OutElem, OutErr, OutDone, InElem, InErr2, InDone, Env | R>;
};
/**
 * Applies a side effect function to each output element of the channel,
 * returning a new channel that emits the same elements.
 *
 * **Details**
 *
 * The `tap` function allows you to perform side effects (like logging or
 * debugging) on each element emitted by a channel without modifying the
 * elements themselves.
 *
 * **Example** (Tapping channel output)
 *
 * ```ts
 * import { Channel, Console, Data } from "effect"
 *
 * class LogError extends Data.TaggedError("LogError")<{
 *   readonly message: string
 * }> {}
 *
 * // Create a channel that outputs numbers
 * const numberChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Tap into each output element to perform side effects
 * const tappedChannel = Channel.tap(
 *   numberChannel,
 *   (n) => Console.log(`Processing number: ${n}`)
 * )
 *
 * // The channel still outputs the same elements but logs each one
 * // Outputs: 1, 2, 3 (while logging each)
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const tap: {
    /**
     * Applies a side effect function to each output element of the channel,
     * returning a new channel that emits the same elements.
     *
     * **Details**
     *
     * The `tap` function allows you to perform side effects (like logging or
     * debugging) on each element emitted by a channel without modifying the
     * elements themselves.
     *
     * **Example** (Tapping channel output)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class LogError extends Data.TaggedError("LogError")<{
     *   readonly message: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Tap into each output element to perform side effects
     * const tappedChannel = Channel.tap(
     *   numberChannel,
     *   (n) => Console.log(`Processing number: ${n}`)
     * )
     *
     * // The channel still outputs the same elements but logs each one
     * // Outputs: 1, 2, 3 (while logging each)
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, X, OutErr1, Env1>(f: (d: Types.NoInfer<OutElem>) => Effect.Effect<X, OutErr1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr1 | OutErr, OutDone, InElem, InErr, InDone, Env1 | Env>;
    /**
     * Applies a side effect function to each output element of the channel,
     * returning a new channel that emits the same elements.
     *
     * **Details**
     *
     * The `tap` function allows you to perform side effects (like logging or
     * debugging) on each element emitted by a channel without modifying the
     * elements themselves.
     *
     * **Example** (Tapping channel output)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class LogError extends Data.TaggedError("LogError")<{
     *   readonly message: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Tap into each output element to perform side effects
     * const tappedChannel = Channel.tap(
     *   numberChannel,
     *   (n) => Console.log(`Processing number: ${n}`)
     * )
     *
     * // The channel still outputs the same elements but logs each one
     * // Outputs: 1, 2, 3 (while logging each)
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, X, OutErr1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: Types.NoInfer<OutElem>) => Effect.Effect<X, OutErr1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
    }): Channel<OutElem, OutErr | OutErr1, OutDone, InElem, InErr, InDone, Env | Env1>;
};
/**
 * Maps each output element to a channel and flattens the child channel
 * outputs.
 *
 * **Details**
 *
 * The source channel's done value is preserved. Child channel done values are
 * used only for child-channel completion. By default child channels are run
 * sequentially. Use `options.concurrency` and `options.bufferSize` to run child
 * channels concurrently.
 *
 * **Example** (FlatMapping channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class ProcessError extends Data.TaggedError("ProcessError")<{
 *   readonly cause: string
 * }> {}
 *
 * // Create a channel that outputs numbers
 * const numberChannel = Channel.fromIterable([1, 2, 3])
 *
 * // FlatMap each number to create new channels
 * const flatMappedChannel = Channel.flatMap(
 *   numberChannel,
 *   (n) =>
 *     Channel.fromIterable(Array.from({ length: n }, (_, i) => `item-${n}-${i}`))
 * )
 *
 * // Flattens nested channels into a single stream
 * // Outputs: "item-1-0", "item-2-0", "item-2-1", "item-3-0", "item-3-1", "item-3-2"
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const flatMap: {
    /**
     * Maps each output element to a channel and flattens the child channel
     * outputs.
     *
     * **Details**
     *
     * The source channel's done value is preserved. Child channel done values are
     * used only for child-channel completion. By default child channels are run
     * sequentially. Use `options.concurrency` and `options.bufferSize` to run child
     * channels concurrently.
     *
     * **Example** (FlatMapping channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ProcessError extends Data.TaggedError("ProcessError")<{
     *   readonly cause: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // FlatMap each number to create new channels
     * const flatMappedChannel = Channel.flatMap(
     *   numberChannel,
     *   (n) =>
     *     Channel.fromIterable(Array.from({ length: n }, (_, i) => `item-${n}-${i}`))
     * )
     *
     * // Flattens nested channels into a single stream
     * // Outputs: "item-1-0", "item-2-0", "item-2-1", "item-3-0", "item-3-1", "item-3-2"
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (d: OutElem) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem1, OutErr1 | OutErr, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Maps each output element to a channel and flattens the child channel
     * outputs.
     *
     * **Details**
     *
     * The source channel's done value is preserved. Child channel done values are
     * used only for child-channel completion. By default child channels are run
     * sequentially. Use `options.concurrency` and `options.bufferSize` to run child
     * channels concurrently.
     *
     * **Example** (FlatMapping channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ProcessError extends Data.TaggedError("ProcessError")<{
     *   readonly cause: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // FlatMap each number to create new channels
     * const flatMappedChannel = Channel.flatMap(
     *   numberChannel,
     *   (n) =>
     *     Channel.fromIterable(Array.from({ length: n }, (_, i) => `item-${n}-${i}`))
     * )
     *
     * // Flattens nested channels into a single stream
     * // Outputs: "item-1-0", "item-2-0", "item-2-1", "item-3-0", "item-3-1", "item-3-2"
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: OutElem) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): Channel<OutElem1, OutErr | OutErr1, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
/**
 * Concatenates this channel with another channel created from the terminal value
 * of this channel. The new channel is created using the provided function.
 *
 * **Example** (Concatenating with completion values)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class ConcatError extends Data.TaggedError("ConcatError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel that outputs numbers and terminates with sum
 * const numberChannel = Channel.fromIterable([1, 2, 3]).pipe(
 *   Channel.concatWith((sum: void) => Channel.succeed(`Completed processing`))
 * )
 *
 * // Concatenates additional channel based on completion value
 * // Outputs: 1, 2, 3, then "Completed processing"
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const concatWith: {
    /**
     * Concatenates this channel with another channel created from the terminal value
     * of this channel. The new channel is created using the provided function.
     *
     * **Example** (Concatenating with completion values)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ConcatError extends Data.TaggedError("ConcatError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel that outputs numbers and terminates with sum
     * const numberChannel = Channel.fromIterable([1, 2, 3]).pipe(
     *   Channel.concatWith((sum: void) => Channel.succeed(`Completed processing`))
     * )
     *
     * // Concatenates additional channel based on completion value
     * // Outputs: 1, 2, 3, then "Completed processing"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutDone, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (leftover: Types.NoInfer<OutDone>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Concatenates this channel with another channel created from the terminal value
     * of this channel. The new channel is created using the provided function.
     *
     * **Example** (Concatenating with completion values)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ConcatError extends Data.TaggedError("ConcatError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel that outputs numbers and terminates with sum
     * const numberChannel = Channel.fromIterable([1, 2, 3]).pipe(
     *   Channel.concatWith((sum: void) => Channel.succeed(`Completed processing`))
     * )
     *
     * // Concatenates additional channel based on completion value
     * // Outputs: 1, 2, 3, then "Completed processing"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (leftover: Types.NoInfer<OutDone>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
};
/**
 * Concatenates this channel with another channel, so that the second channel
 * starts emitting values after the first channel has completed.
 *
 * **Example** (Concatenating channels)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class ConcatError extends Data.TaggedError("ConcatError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create two channels
 * const firstChannel = Channel.fromIterable([1, 2, 3])
 * const secondChannel = Channel.fromIterable(["a", "b", "c"])
 *
 * // Concatenate them
 * const concatenatedChannel = Channel.concat(firstChannel, secondChannel)
 *
 * // Outputs: 1, 2, 3, "a", "b", "c"
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const concat: {
    /**
     * Concatenates this channel with another channel, so that the second channel
     * starts emitting values after the first channel has completed.
     *
     * **Example** (Concatenating channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ConcatError extends Data.TaggedError("ConcatError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create two channels
     * const firstChannel = Channel.fromIterable([1, 2, 3])
     * const secondChannel = Channel.fromIterable(["a", "b", "c"])
     *
     * // Concatenate them
     * const concatenatedChannel = Channel.concat(firstChannel, secondChannel)
     *
     * // Outputs: 1, 2, 3, "a", "b", "c"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(that: Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Concatenates this channel with another channel, so that the second channel
     * starts emitting values after the first channel has completed.
     *
     * **Example** (Concatenating channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class ConcatError extends Data.TaggedError("ConcatError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create two channels
     * const firstChannel = Channel.fromIterable([1, 2, 3])
     * const secondChannel = Channel.fromIterable(["a", "b", "c"])
     *
     * // Concatenate them
     * const concatenatedChannel = Channel.concat(firstChannel, secondChannel)
     *
     * // Outputs: 1, 2, 3, "a", "b", "c"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, that: Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
};
/**
 * Combines two channels with a stateful pull function.
 *
 * **When to use**
 *
 * Use to coordinate pulling from two channels when each output element depends
 * on both sides and local state.
 *
 * **Details**
 *
 * The combining function receives the current state and pull functions for the
 * left and right channels. It returns the next output element together with the
 * next state.
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const combine: {
    /**
     * Combines two channels with a stateful pull function.
     *
     * **When to use**
     *
     * Use to coordinate pulling from two channels when each output element depends
     * on both sides and local state.
     *
     * **Details**
     *
     * The combining function receives the current state and pull functions for the
     * left and right channels. It returns the next output element together with the
     * next state.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2, S, OutElem, OutErr, OutDone, A, E, R>(that: Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>, s: LazyArg<S>, f: (s: S, pullLeft: Pull.Pull<OutElem, OutErr, OutDone>, pullRight: Pull.Pull<OutElem2, OutErr2, OutDone2>) => Effect.Effect<readonly [A, S], E, R>): <InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<A, Pull.ExcludeDone<E>, Cause.Done.Extract<E>, InElem & InElem2, InErr & InErr2, InDone & InDone2, Env | Env2 | R>;
    /**
     * Combines two channels with a stateful pull function.
     *
     * **When to use**
     *
     * Use to coordinate pulling from two channels when each output element depends
     * on both sides and local state.
     *
     * **Details**
     *
     * The combining function receives the current state and pull functions for the
     * left and right channels. It returns the next output element together with the
     * next state.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2, S, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, that: Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>, s: LazyArg<S>, f: (s: S, pullLeft: Pull.Pull<OutElem, OutErr, OutDone>, pullRight: Pull.Pull<OutElem2, OutErr2, OutDone2>) => Effect.Effect<readonly [A, S], E, R>): Channel<A, Pull.ExcludeDone<E>, Cause.Done.Extract<E>, InElem & InElem2, InErr & InErr2, InDone & InDone2, Env | Env2 | R>;
};
/**
 * Runs a fallback channel if this channel completes without emitting any
 * output elements.
 *
 * **Details**
 *
 * If the source emits at least one element, the source is used unchanged. If
 * the source completes before emitting an element, the fallback function
 * receives the source done value and returns the replacement channel.
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const orElseIfEmpty: {
    /**
     * Runs a fallback channel if this channel completes without emitting any
     * output elements.
     *
     * **Details**
     *
     * If the source emits at least one element, the source is used unchanged. If
     * the source completes before emitting an element, the fallback function
     * receives the source done value and returns the replacement channel.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutDone, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (leftover: Types.NoInfer<OutDone>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Runs a fallback channel if this channel completes without emitting any
     * output elements.
     *
     * **Details**
     *
     * If the source emits at least one element, the source is used unchanged. If
     * the source completes before emitting an element, the fallback function
     * receives the source done value and returns the replacement channel.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (leftover: Types.NoInfer<OutDone>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr1 | OutErr, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
};
/**
 * Flattens a channel of channels.
 *
 * **Example** (Flattening nested channels)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class FlattenError extends Data.TaggedError("FlattenError")<{
 *   readonly cause: string
 * }> {}
 *
 * // Create a channel that outputs channels
 * const nestedChannels = Channel.fromIterable([
 *   Channel.fromIterable([1, 2]),
 *   Channel.fromIterable([3, 4]),
 *   Channel.fromIterable([5, 6])
 * ])
 *
 * // Flatten the nested channels
 * const flattenedChannel = Channel.flatten(nestedChannels)
 *
 * // Outputs: 1, 2, 3, 4, 5, 6
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const flatten: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(channels: Channel<Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>) => Channel<OutElem, OutErr | OutErr1, OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
/**
 * Flattens a channel that outputs arrays into a channel that outputs individual elements.
 *
 * **Example** (Flattening arrays of channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class FlattenError extends Data.TaggedError("FlattenError")<{
 *   readonly message: string
 * }> {}
 *
 * // Create a channel that outputs arrays
 * const arrayChannel = Channel.fromIterable([
 *   [1, 2, 3],
 *   [4, 5],
 *   [6, 7, 8, 9]
 * ])
 *
 * // Flatten the arrays into individual elements
 * const flattenedChannel = Channel.flattenArray(arrayChannel)
 *
 * // Outputs: 1, 2, 3, 4, 5, 6, 7, 8, 9
 * ```
 *
 * @category transforming
 * @since 4.0.0
 */
export declare const flattenArray: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<ReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
/**
 * Flattens a channel that emits `Take` values into a channel that emits the
 * `Take` outputs directly.
 *
 * **Details**
 *
 * Output `Take` values are emitted as non-empty arrays. Failed `Take` values
 * fail the returned channel. Done `Take` values complete the returned channel.
 *
 * @category transforming
 * @since 4.0.0
 */
export declare const flattenTake: <OutElem, OutErr, OutDone, OutErr2, OutDone2, InElem, InErr, InDone, Env>(self: Channel<Take.Take<OutElem, OutErr, OutDone>, OutErr2, OutDone2, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr | OutErr2, OutDone, InElem, InErr, InDone, Env>;
/**
 * Creates a new channel that consumes all output from the source channel
 * but emits nothing, preserving only the completion value.
 *
 * **Example** (Draining channel output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel that outputs values
 * const sourceChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Drain all output, keeping only the completion
 * const drainedChannel = Channel.drain(sourceChannel)
 *
 * // The channel completes but emits no values
 * // Useful for consuming side effects without collecting output
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const drain: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<never, OutErr, OutDone, InElem, InErr, InDone, Env>;
/**
 * Repeats this channel according to the provided schedule.
 *
 * @category repetition
 * @since 4.0.0
 */
export declare const repeat: {
    /**
     * Repeats this channel according to the provided schedule.
     *
     * @category repetition
     * @since 4.0.0
     */
    <SO, OutDone, SE, SR>(schedule: Schedule.Schedule<SO, Types.NoInfer<OutDone>, SE, SR> | (($: <SO, SE, SR>(_: Schedule.Schedule<SO, NoInfer<OutDone>, SE, SR>) => Schedule.Schedule<SO, OutDone, SE, SR>) => Schedule.Schedule<SO, Types.NoInfer<OutDone>, SE, SR>)): <OutElem, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>) => Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>;
    /**
     * Repeats this channel according to the provided schedule.
     *
     * @category repetition
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, SO, SE, SR>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, schedule: Schedule.Schedule<SO, OutDone, SE, SR> | (($: <SO, SE, SR>(_: Schedule.Schedule<SO, NoInfer<OutDone>, SE, SR>) => Schedule.Schedule<SO, OutDone, SE, SR>) => Schedule.Schedule<SO, Types.NoInfer<OutDone>, SE, SR>)): Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>;
};
/**
 * Repeats this channel forever.
 *
 * @category repetition
 * @since 4.0.0
 */
export declare const forever: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, never, InElem, InErr, InDone, Env>;
/**
 * Runs a schedule step for each output element while preserving the emitted
 * elements.
 *
 * **Details**
 *
 * The schedule receives each output element as input. Schedule delays are
 * applied between emitted elements. If the schedule fails, the returned channel
 * fails. If the schedule finishes, the returned channel completes with the
 * schedule output.
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const schedule: {
    /**
     * Runs a schedule step for each output element while preserving the emitted
     * elements.
     *
     * **Details**
     *
     * The schedule receives each output element as input. Schedule delays are
     * applied between emitted elements. If the schedule fails, the returned channel
     * fails. If the schedule finishes, the returned channel completes with the
     * schedule output.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <SO, OutElem, SE, SR>(schedule: Schedule.Schedule<SO, Types.NoInfer<OutElem>, SE, SR>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>) => Channel<OutElem, OutErr | SE, OutDone | SO, InElem, InErr, InDone, Env | SR>;
    /**
     * Runs a schedule step for each output element while preserving the emitted
     * elements.
     *
     * **Details**
     *
     * The schedule receives each output element as input. Schedule delays are
     * applied between emitted elements. If the schedule fails, the returned channel
     * fails. If the schedule finishes, the returned channel completes with the
     * schedule output.
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, SO, SE, SR>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, schedule: Schedule.Schedule<SO, OutElem, SE, SR>): Channel<OutElem, OutErr | SE, OutDone | SO, InElem, InErr, InDone, Env | SR>;
};
/**
 * Filters the output elements of a channel using a predicate function.
 * Elements that don't match the predicate are discarded.
 *
 * **Example** (Filtering channel output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel with mixed numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5, 6, 7, 8])
 *
 * // Filter to keep only even numbers
 * const evenChannel = Channel.filter(numbersChannel, (n) => n % 2 === 0)
 * // Outputs: 2, 4, 6, 8
 *
 * // Filter with type refinement
 * const mixedChannel = Channel.fromIterable([1, "hello", 2, "world", 3])
 * const numbersOnlyChannel = Channel.filter(
 *   mixedChannel,
 *   (value): value is number => typeof value === "number"
 * )
 * // Outputs: 1, 2, 3 (all typed as numbers)
 * ```
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filter: {
    /**
     * Filters the output elements of a channel using a predicate function.
     * Elements that don't match the predicate are discarded.
     *
     * **Example** (Filtering channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with mixed numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5, 6, 7, 8])
     *
     * // Filter to keep only even numbers
     * const evenChannel = Channel.filter(numbersChannel, (n) => n % 2 === 0)
     * // Outputs: 2, 4, 6, 8
     *
     * // Filter with type refinement
     * const mixedChannel = Channel.fromIterable([1, "hello", 2, "world", 3])
     * const numbersOnlyChannel = Channel.filter(
     *   mixedChannel,
     *   (value): value is number => typeof value === "number"
     * )
     * // Outputs: 1, 2, 3 (all typed as numbers)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B extends OutElem>(refinement: Predicate.Refinement<OutElem, B>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<B, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters the output elements of a channel using a predicate function.
     * Elements that don't match the predicate are discarded.
     *
     * **Example** (Filtering channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with mixed numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5, 6, 7, 8])
     *
     * // Filter to keep only even numbers
     * const evenChannel = Channel.filter(numbersChannel, (n) => n % 2 === 0)
     * // Outputs: 2, 4, 6, 8
     *
     * // Filter with type refinement
     * const mixedChannel = Channel.fromIterable([1, "hello", 2, "world", 3])
     * const numbersOnlyChannel = Channel.filter(
     *   mixedChannel,
     *   (value): value is number => typeof value === "number"
     * )
     * // Outputs: 1, 2, 3 (all typed as numbers)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem>(predicate: Predicate.Predicate<OutElem>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters the output elements of a channel using a predicate function.
     * Elements that don't match the predicate are discarded.
     *
     * **Example** (Filtering channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with mixed numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5, 6, 7, 8])
     *
     * // Filter to keep only even numbers
     * const evenChannel = Channel.filter(numbersChannel, (n) => n % 2 === 0)
     * // Outputs: 2, 4, 6, 8
     *
     * // Filter with type refinement
     * const mixedChannel = Channel.fromIterable([1, "hello", 2, "world", 3])
     * const numbersOnlyChannel = Channel.filter(
     *   mixedChannel,
     *   (value): value is number => typeof value === "number"
     * )
     * // Outputs: 1, 2, 3 (all typed as numbers)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B extends OutElem>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, refinement: Predicate.Refinement<OutElem, B>): Channel<B, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters the output elements of a channel using a predicate function.
     * Elements that don't match the predicate are discarded.
     *
     * **Example** (Filtering channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with mixed numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5, 6, 7, 8])
     *
     * // Filter to keep only even numbers
     * const evenChannel = Channel.filter(numbersChannel, (n) => n % 2 === 0)
     * // Outputs: 2, 4, 6, 8
     *
     * // Filter with type refinement
     * const mixedChannel = Channel.fromIterable([1, "hello", 2, "world", 3])
     * const numbersOnlyChannel = Channel.filter(
     *   mixedChannel,
     *   (value): value is number => typeof value === "number"
     * )
     * // Outputs: 1, 2, 3 (all typed as numbers)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: Predicate.Predicate<OutElem>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Filters and maps output elements using a `Filter`.
 *
 * **When to use**
 *
 * Use to keep only channel output elements accepted by a `Filter` and emit
 * each filter success value.
 *
 * **Details**
 *
 * Successful filter results are emitted as mapped values. Failed filter
 * results are discarded. The source channel's errors and done value are
 * preserved.
 *
 * @see {@link filter} for keeping original output elements with a predicate
 * @see {@link filterMapEffect} for using an effectful `Filter`
 * @see {@link filterMapArray} for filtering arrays of output elements
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterMap: {
    /**
     * Filters and maps output elements using a `Filter`.
     *
     * **When to use**
     *
     * Use to keep only channel output elements accepted by a `Filter` and emit
     * each filter success value.
     *
     * **Details**
     *
     * Successful filter results are emitted as mapped values. Failed filter
     * results are discarded. The source channel's errors and done value are
     * preserved.
     *
     * @see {@link filter} for keeping original output elements with a predicate
     * @see {@link filterMapEffect} for using an effectful `Filter`
     * @see {@link filterMapArray} for filtering arrays of output elements
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B, X>(filter: Filter.Filter<OutElem, B, X>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<B, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters and maps output elements using a `Filter`.
     *
     * **When to use**
     *
     * Use to keep only channel output elements accepted by a `Filter` and emit
     * each filter success value.
     *
     * **Details**
     *
     * Successful filter results are emitted as mapped values. Failed filter
     * results are discarded. The source channel's errors and done value are
     * preserved.
     *
     * @see {@link filter} for keeping original output elements with a predicate
     * @see {@link filterMapEffect} for using an effectful `Filter`
     * @see {@link filterMapArray} for filtering arrays of output elements
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B, X>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.Filter<OutElem, B, X>): Channel<B, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Filters output elements with an effectful predicate.
 *
 * **When to use**
 *
 * Use when the keep/discard decision depends on an Effect or service and
 * predicate failures should fail the returned channel.
 *
 * **Details**
 *
 * Elements for which the predicate succeeds with `true` are emitted. Elements
 * for which the predicate succeeds with `false` are discarded. Predicate
 * failures fail the returned channel.
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterEffect: {
    /**
     * Filters output elements with an effectful predicate.
     *
     * **When to use**
     *
     * Use when the keep/discard decision depends on an Effect or service and
     * predicate failures should fail the returned channel.
     *
     * **Details**
     *
     * Elements for which the predicate succeeds with `true` are emitted. Elements
     * for which the predicate succeeds with `false` are discarded. Predicate
     * failures fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, E, R>(predicate: (a: OutElem) => Effect.Effect<boolean, E, R>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Filters output elements with an effectful predicate.
     *
     * **When to use**
     *
     * Use when the keep/discard decision depends on an Effect or service and
     * predicate failures should fail the returned channel.
     *
     * **Details**
     *
     * Elements for which the predicate succeeds with `true` are emitted. Elements
     * for which the predicate succeeds with `false` are discarded. Predicate
     * failures fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: (a: OutElem) => Effect.Effect<boolean, E, R>): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Filters and maps output elements using an effectful `Filter`.
 *
 * **When to use**
 *
 * Use to apply effectful logic that can discard channel output elements and
 * emit transformed values for the elements that pass.
 *
 * **Details**
 *
 * Successful filter results are emitted as mapped values. Failed filter
 * results are discarded. Failures from the effectful filter fail the returned
 * channel.
 *
 * @see {@link filterMap} for using a synchronous `Filter`
 * @see {@link filterEffect} for effectfully keeping original output elements
 * @see {@link mapEffect} for effectfully transforming every output element
 * @see {@link filterMapArrayEffect} for effectful filtering of array outputs
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterMapEffect: {
    /**
     * Filters and maps output elements using an effectful `Filter`.
     *
     * **When to use**
     *
     * Use to apply effectful logic that can discard channel output elements and
     * emit transformed values for the elements that pass.
     *
     * **Details**
     *
     * Successful filter results are emitted as mapped values. Failed filter
     * results are discarded. Failures from the effectful filter fail the returned
     * channel.
     *
     * @see {@link filterMap} for using a synchronous `Filter`
     * @see {@link filterEffect} for effectfully keeping original output elements
     * @see {@link mapEffect} for effectfully transforming every output element
     * @see {@link filterMapArrayEffect} for effectful filtering of array outputs
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B, X, EX, RX>(filter: Filter.FilterEffect<OutElem, B, X, EX, RX>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<B, OutErr | EX, OutDone, InElem, InErr, InDone, Env | RX>;
    /**
     * Filters and maps output elements using an effectful `Filter`.
     *
     * **When to use**
     *
     * Use to apply effectful logic that can discard channel output elements and
     * emit transformed values for the elements that pass.
     *
     * **Details**
     *
     * Successful filter results are emitted as mapped values. Failed filter
     * results are discarded. Failures from the effectful filter fail the returned
     * channel.
     *
     * @see {@link filterMap} for using a synchronous `Filter`
     * @see {@link filterEffect} for effectfully keeping original output elements
     * @see {@link mapEffect} for effectfully transforming every output element
     * @see {@link filterMapArrayEffect} for effectful filtering of array outputs
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B, X, EX, RX>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.FilterEffect<OutElem, B, X, EX, RX>): Channel<B, OutErr | EX, OutDone, InElem, InErr, InDone, Env | RX>;
};
/**
 * Filters arrays of elements emitted by a channel, applying the filter
 * to each element within the arrays and only emitting non-empty filtered arrays.
 *
 * **Example** (Filtering array output)
 *
 * ```ts
 * import { Array, Channel } from "effect"
 *
 * const nonEmptyArrayPredicate = Array.isReadonlyArrayNonEmpty
 *
 * // Create a channel that outputs arrays of mixed data
 * const arrayChannel = Channel.fromIterable([
 *   Array.make(1, 2, 3, 4, 5),
 *   Array.make(6, 7, 8, 9, 10),
 *   Array.make(11, 12, 13, 14, 15)
 * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
 *
 * // Filter arrays to keep only even numbers
 * const evenArraysChannel = Channel.filterArray(arrayChannel, (n) => n % 2 === 0)
 * // Outputs: [2, 4], [6, 8, 10], [12, 14]
 * // Note: Only non-empty filtered arrays are emitted
 *
 * // Arrays that would become empty after filtering are discarded entirely
 * const oddChannel = Channel.fromIterable([
 *   Array.make(1, 3, 5),
 *   Array.make(2, 4),
 *   Array.make(7, 9)
 * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
 * const filteredOddChannel = Channel.filterArray(oddChannel, (n) => n % 2 === 0)
 * // Outputs: [2, 4] (the arrays [1,3,5] and [7,9] are discarded)
 * ```
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterArray: {
    /**
     * Filters arrays of elements emitted by a channel, applying the filter
     * to each element within the arrays and only emitting non-empty filtered arrays.
     *
     * **Example** (Filtering array output)
     *
     * ```ts
     * import { Array, Channel } from "effect"
     *
     * const nonEmptyArrayPredicate = Array.isReadonlyArrayNonEmpty
     *
     * // Create a channel that outputs arrays of mixed data
     * const arrayChannel = Channel.fromIterable([
     *   Array.make(1, 2, 3, 4, 5),
     *   Array.make(6, 7, 8, 9, 10),
     *   Array.make(11, 12, 13, 14, 15)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     *
     * // Filter arrays to keep only even numbers
     * const evenArraysChannel = Channel.filterArray(arrayChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4], [6, 8, 10], [12, 14]
     * // Note: Only non-empty filtered arrays are emitted
     *
     * // Arrays that would become empty after filtering are discarded entirely
     * const oddChannel = Channel.fromIterable([
     *   Array.make(1, 3, 5),
     *   Array.make(2, 4),
     *   Array.make(7, 9)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     * const filteredOddChannel = Channel.filterArray(oddChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4] (the arrays [1,3,5] and [7,9] are discarded)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B extends OutElem>(refinement: Predicate.Refinement<OutElem, B>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<B>, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters arrays of elements emitted by a channel, applying the filter
     * to each element within the arrays and only emitting non-empty filtered arrays.
     *
     * **Example** (Filtering array output)
     *
     * ```ts
     * import { Array, Channel } from "effect"
     *
     * const nonEmptyArrayPredicate = Array.isReadonlyArrayNonEmpty
     *
     * // Create a channel that outputs arrays of mixed data
     * const arrayChannel = Channel.fromIterable([
     *   Array.make(1, 2, 3, 4, 5),
     *   Array.make(6, 7, 8, 9, 10),
     *   Array.make(11, 12, 13, 14, 15)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     *
     * // Filter arrays to keep only even numbers
     * const evenArraysChannel = Channel.filterArray(arrayChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4], [6, 8, 10], [12, 14]
     * // Note: Only non-empty filtered arrays are emitted
     *
     * // Arrays that would become empty after filtering are discarded entirely
     * const oddChannel = Channel.fromIterable([
     *   Array.make(1, 3, 5),
     *   Array.make(2, 4),
     *   Array.make(7, 9)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     * const filteredOddChannel = Channel.filterArray(oddChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4] (the arrays [1,3,5] and [7,9] are discarded)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem>(predicate: Predicate.Predicate<Types.NoInfer<OutElem>>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters arrays of elements emitted by a channel, applying the filter
     * to each element within the arrays and only emitting non-empty filtered arrays.
     *
     * **Example** (Filtering array output)
     *
     * ```ts
     * import { Array, Channel } from "effect"
     *
     * const nonEmptyArrayPredicate = Array.isReadonlyArrayNonEmpty
     *
     * // Create a channel that outputs arrays of mixed data
     * const arrayChannel = Channel.fromIterable([
     *   Array.make(1, 2, 3, 4, 5),
     *   Array.make(6, 7, 8, 9, 10),
     *   Array.make(11, 12, 13, 14, 15)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     *
     * // Filter arrays to keep only even numbers
     * const evenArraysChannel = Channel.filterArray(arrayChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4], [6, 8, 10], [12, 14]
     * // Note: Only non-empty filtered arrays are emitted
     *
     * // Arrays that would become empty after filtering are discarded entirely
     * const oddChannel = Channel.fromIterable([
     *   Array.make(1, 3, 5),
     *   Array.make(2, 4),
     *   Array.make(7, 9)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     * const filteredOddChannel = Channel.filterArray(oddChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4] (the arrays [1,3,5] and [7,9] are discarded)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B extends OutElem>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, refinement: Predicate.Refinement<OutElem, B>): Channel<Arr.NonEmptyReadonlyArray<B>, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters arrays of elements emitted by a channel, applying the filter
     * to each element within the arrays and only emitting non-empty filtered arrays.
     *
     * **Example** (Filtering array output)
     *
     * ```ts
     * import { Array, Channel } from "effect"
     *
     * const nonEmptyArrayPredicate = Array.isReadonlyArrayNonEmpty
     *
     * // Create a channel that outputs arrays of mixed data
     * const arrayChannel = Channel.fromIterable([
     *   Array.make(1, 2, 3, 4, 5),
     *   Array.make(6, 7, 8, 9, 10),
     *   Array.make(11, 12, 13, 14, 15)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     *
     * // Filter arrays to keep only even numbers
     * const evenArraysChannel = Channel.filterArray(arrayChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4], [6, 8, 10], [12, 14]
     * // Note: Only non-empty filtered arrays are emitted
     *
     * // Arrays that would become empty after filtering are discarded entirely
     * const oddChannel = Channel.fromIterable([
     *   Array.make(1, 3, 5),
     *   Array.make(2, 4),
     *   Array.make(7, 9)
     * ]).pipe(Channel.filter(nonEmptyArrayPredicate))
     * const filteredOddChannel = Channel.filterArray(oddChannel, (n) => n % 2 === 0)
     * // Outputs: [2, 4] (the arrays [1,3,5] and [7,9] are discarded)
     * ```
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: Predicate.Predicate<Types.NoInfer<OutElem>>): Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Filters and maps each element inside emitted non-empty arrays using a
 * `Filter`.
 *
 * **Details**
 *
 * Successful filter results are kept as mapped values. Failed filter results
 * are removed from the array. Arrays that become empty are discarded.
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterMapArray: {
    /**
     * Filters and maps each element inside emitted non-empty arrays using a
     * `Filter`.
     *
     * **Details**
     *
     * Successful filter results are kept as mapped values. Failed filter results
     * are removed from the array. Arrays that become empty are discarded.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B, X>(filter: Filter.Filter<Types.NoInfer<OutElem>, B, X>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<B>, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Filters and maps each element inside emitted non-empty arrays using a
     * `Filter`.
     *
     * **Details**
     *
     * Successful filter results are kept as mapped values. Failed filter results
     * are removed from the array. Arrays that become empty are discarded.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B, X>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.Filter<OutElem, B, X>): Channel<Arr.NonEmptyReadonlyArray<B>, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Filters each element inside emitted non-empty arrays with an effectful
 * predicate.
 *
 * **When to use**
 *
 * Use when filtering array-valued channel outputs requires Effects or services,
 * and arrays that become empty should be skipped.
 *
 * **Details**
 *
 * The predicate receives the element and its index within the array. Elements
 * for which the predicate succeeds with `true` are kept. Arrays that become
 * empty are discarded. Predicate failures fail the returned channel.
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterArrayEffect: {
    /**
     * Filters each element inside emitted non-empty arrays with an effectful
     * predicate.
     *
     * **When to use**
     *
     * Use when filtering array-valued channel outputs requires Effects or services,
     * and arrays that become empty should be skipped.
     *
     * **Details**
     *
     * The predicate receives the element and its index within the array. Elements
     * for which the predicate succeeds with `true` are kept. Arrays that become
     * empty are discarded. Predicate failures fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, E, R>(predicate: (a: Types.NoInfer<OutElem>, index: number) => Effect.Effect<boolean, E, R>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Filters each element inside emitted non-empty arrays with an effectful
     * predicate.
     *
     * **When to use**
     *
     * Use when filtering array-valued channel outputs requires Effects or services,
     * and arrays that become empty should be skipped.
     *
     * **Details**
     *
     * The predicate receives the element and its index within the array. Elements
     * for which the predicate succeeds with `true` are kept. Arrays that become
     * empty are discarded. Predicate failures fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, E, R>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: (a: Types.NoInfer<OutElem>, index: number) => Effect.Effect<boolean, E, R>): Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Filters and maps each element inside emitted non-empty arrays using an
 * effectful `Filter`.
 *
 * **When to use**
 *
 * Use when array-valued channel outputs need an effectful filter-map that can
 * fail and can discard arrays that become empty.
 *
 * **Details**
 *
 * Successful filter results are kept as mapped values. Failed filter results
 * are removed from the array. Arrays that become empty are discarded. Failures
 * from the effectful filter fail the returned channel.
 *
 * @category filtering
 * @since 4.0.0
 */
export declare const filterMapArrayEffect: {
    /**
     * Filters and maps each element inside emitted non-empty arrays using an
     * effectful `Filter`.
     *
     * **When to use**
     *
     * Use when array-valued channel outputs need an effectful filter-map that can
     * fail and can discard arrays that become empty.
     *
     * **Details**
     *
     * Successful filter results are kept as mapped values. Failed filter results
     * are removed from the array. Arrays that become empty are discarded. Failures
     * from the effectful filter fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, B, X, EX, RX>(filter: Filter.FilterEffect<Types.NoInfer<OutElem>, B, X, EX, RX>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<B>, OutErr | EX, OutDone, InElem, InErr, InDone, Env | RX>;
    /**
     * Filters and maps each element inside emitted non-empty arrays using an
     * effectful `Filter`.
     *
     * **When to use**
     *
     * Use when array-valued channel outputs need an effectful filter-map that can
     * fail and can discard arrays that become empty.
     *
     * **Details**
     *
     * Successful filter results are kept as mapped values. Failed filter results
     * are removed from the array. Arrays that become empty are discarded. Failures
     * from the effectful filter fail the returned channel.
     *
     * @category filtering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, B, X, EX, RX>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.FilterEffect<OutElem, B, X, EX, RX>): Channel<Arr.NonEmptyReadonlyArray<B>, OutErr | EX, OutDone, InElem, InErr, InDone, Env | RX>;
};
/**
 * Maps over a channel statefully with an accumulator, where each element can produce multiple output values.
 *
 * **Example** (Mapping with accumulated state)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * // Create a channel with numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
 *
 * // Use mapAccum to create running sums and emit both current and sum
 * const runningSum = Channel.mapAccum(
 *   numbersChannel,
 *   () => 0, // initial accumulator state
 *   (sum, current) => {
 *     const newSum = sum + current
 *     // Return [newState, outputValues]
 *     return [newSum, [current, newSum]] as const
 *   }
 * )
 * // Outputs: 1, 1, 2, 3, 3, 6, 4, 10
 *
 * // Using with Effect for async processing
 * const asyncMapAccum = Channel.mapAccum(
 *   numbersChannel,
 *   () => "",
 *   (acc, value) =>
 *     Effect.gen(function*() {
 *       const newAcc = acc + value.toString()
 *       return [newAcc, [`${value}-processed`, newAcc]] as const
 *     })
 * )
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const mapAccum: {
    /**
     * Maps over a channel statefully with an accumulator, where each element can produce multiple output values.
     *
     * **Example** (Mapping with accumulated state)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
     *
     * // Use mapAccum to create running sums and emit both current and sum
     * const runningSum = Channel.mapAccum(
     *   numbersChannel,
     *   () => 0, // initial accumulator state
     *   (sum, current) => {
     *     const newSum = sum + current
     *     // Return [newState, outputValues]
     *     return [newSum, [current, newSum]] as const
     *   }
     * )
     * // Outputs: 1, 1, 2, 3, 3, 6, 4, 10
     *
     * // Using with Effect for async processing
     * const asyncMapAccum = Channel.mapAccum(
     *   numbersChannel,
     *   () => "",
     *   (acc, value) =>
     *     Effect.gen(function*() {
     *       const newAcc = acc + value.toString()
     *       return [newAcc, [`${value}-processed`, newAcc]] as const
     *     })
     * )
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <S, OutElem, B, E = never, R = never>(initial: LazyArg<S>, f: (s: S, a: Types.NoInfer<OutElem>) => Effect.Effect<readonly [state: S, values: ReadonlyArray<B>], E, R> | readonly [state: S, values: ReadonlyArray<B>], options?: {
        readonly onHalt?: ((state: S) => Array<B>) | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<B, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Maps over a channel statefully with an accumulator, where each element can produce multiple output values.
     *
     * **Example** (Mapping with accumulated state)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
     *
     * // Use mapAccum to create running sums and emit both current and sum
     * const runningSum = Channel.mapAccum(
     *   numbersChannel,
     *   () => 0, // initial accumulator state
     *   (sum, current) => {
     *     const newSum = sum + current
     *     // Return [newState, outputValues]
     *     return [newSum, [current, newSum]] as const
     *   }
     * )
     * // Outputs: 1, 1, 2, 3, 3, 6, 4, 10
     *
     * // Using with Effect for async processing
     * const asyncMapAccum = Channel.mapAccum(
     *   numbersChannel,
     *   () => "",
     *   (acc, value) =>
     *     Effect.gen(function*() {
     *       const newAcc = acc + value.toString()
     *       return [newAcc, [`${value}-processed`, newAcc]] as const
     *     })
     * )
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, S, B, E = never, R = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, initial: LazyArg<S>, f: (s: S, a: Types.NoInfer<OutElem>) => Effect.Effect<readonly [state: S, values: ReadonlyArray<B>], E, R> | readonly [state: S, values: ReadonlyArray<B>], options?: {
        readonly onHalt?: ((state: S) => Array<B>) | undefined;
    }): Channel<B, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Transforms a channel statefully by scanning over its output with an accumulator function.
 * Emits the intermediate results of the scan operation.
 *
 * **Example** (Scanning channel output)
 *
 * ```ts
 * import { Channel } from "effect"
 *
 * // Create a channel with numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Scan to create running sum
 * const runningSumChannel = Channel.scan(numbersChannel, 0, (sum, n) => sum + n)
 * // Outputs: 0, 1, 3, 6, 10, 15
 * // Note: emits the initial value and each intermediate result
 *
 * // Scan with string concatenation
 * const wordsChannel = Channel.fromIterable(["hello", "world", "from", "effect"])
 * const sentenceChannel = Channel.scan(
 *   wordsChannel,
 *   "",
 *   (sentence, word) => sentence === "" ? word : `${sentence} ${word}`
 * )
 * // Outputs: "", "hello", "hello world", "hello world from", "hello world from effect"
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const scan: {
    /**
     * Transforms a channel statefully by scanning over its output with an accumulator function.
     * Emits the intermediate results of the scan operation.
     *
     * **Example** (Scanning channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Scan to create running sum
     * const runningSumChannel = Channel.scan(numbersChannel, 0, (sum, n) => sum + n)
     * // Outputs: 0, 1, 3, 6, 10, 15
     * // Note: emits the initial value and each intermediate result
     *
     * // Scan with string concatenation
     * const wordsChannel = Channel.fromIterable(["hello", "world", "from", "effect"])
     * const sentenceChannel = Channel.scan(
     *   wordsChannel,
     *   "",
     *   (sentence, word) => sentence === "" ? word : `${sentence} ${word}`
     * )
     * // Outputs: "", "hello", "hello world", "hello world from", "hello world from effect"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <S, OutElem>(initial: S, f: (s: S, a: Types.NoInfer<OutElem>) => S): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<S, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Transforms a channel statefully by scanning over its output with an accumulator function.
     * Emits the intermediate results of the scan operation.
     *
     * **Example** (Scanning channel output)
     *
     * ```ts
     * import { Channel } from "effect"
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Scan to create running sum
     * const runningSumChannel = Channel.scan(numbersChannel, 0, (sum, n) => sum + n)
     * // Outputs: 0, 1, 3, 6, 10, 15
     * // Note: emits the initial value and each intermediate result
     *
     * // Scan with string concatenation
     * const wordsChannel = Channel.fromIterable(["hello", "world", "from", "effect"])
     * const sentenceChannel = Channel.scan(
     *   wordsChannel,
     *   "",
     *   (sentence, word) => sentence === "" ? word : `${sentence} ${word}`
     * )
     * // Outputs: "", "hello", "hello world", "hello world from", "hello world from effect"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, S>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, initial: S, f: (s: S, a: Types.NoInfer<OutElem>) => S): Channel<S, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Transforms a channel statefully by scanning over its output with an effectful accumulator function.
 * Emits the intermediate results of the scan operation.
 *
 * **When to use**
 *
 * Use when maintaining accumulated state over channel output requires Effects
 * or can fail, while still emitting each intermediate state.
 *
 * **Example** (Scanning channel output with effects)
 *
 * ```ts
 * import { Channel, Data, Effect } from "effect"
 *
 * class ScanError extends Data.TaggedError("ScanError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel with numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
 *
 * // Effectful scan with async operations
 * const asyncScanChannel = Channel.scanEffect(
 *   numbersChannel,
 *   "",
 *   (acc, value) =>
 *     Effect.gen(function*() {
 *       // Simulate async work
 *       yield* Effect.sleep("10 millis")
 *       return acc + value.toString()
 *     })
 * )
 * // Outputs: "", "1", "12", "123", "1234"
 *
 * // Scan with error handling
 * const errorHandlingScan = Channel.scanEffect(
 *   numbersChannel,
 *   0,
 *   (sum, n) => {
 *     if (n < 0) {
 *       return Effect.fail(new ScanError({ reason: "negative number" }))
 *     }
 *     return Effect.succeed(sum + n)
 *   }
 * )
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const scanEffect: {
    /**
     * Transforms a channel statefully by scanning over its output with an effectful accumulator function.
     * Emits the intermediate results of the scan operation.
     *
     * **When to use**
     *
     * Use when maintaining accumulated state over channel output requires Effects
     * or can fail, while still emitting each intermediate state.
     *
     * **Example** (Scanning channel output with effects)
     *
     * ```ts
     * import { Channel, Data, Effect } from "effect"
     *
     * class ScanError extends Data.TaggedError("ScanError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
     *
     * // Effectful scan with async operations
     * const asyncScanChannel = Channel.scanEffect(
     *   numbersChannel,
     *   "",
     *   (acc, value) =>
     *     Effect.gen(function*() {
     *       // Simulate async work
     *       yield* Effect.sleep("10 millis")
     *       return acc + value.toString()
     *     })
     * )
     * // Outputs: "", "1", "12", "123", "1234"
     *
     * // Scan with error handling
     * const errorHandlingScan = Channel.scanEffect(
     *   numbersChannel,
     *   0,
     *   (sum, n) => {
     *     if (n < 0) {
     *       return Effect.fail(new ScanError({ reason: "negative number" }))
     *     }
     *     return Effect.succeed(sum + n)
     *   }
     * )
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <S, OutElem, E, R>(initial: S, f: (s: S, a: Types.NoInfer<OutElem>) => Effect.Effect<S, E, R>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<S, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Transforms a channel statefully by scanning over its output with an effectful accumulator function.
     * Emits the intermediate results of the scan operation.
     *
     * **When to use**
     *
     * Use when maintaining accumulated state over channel output requires Effects
     * or can fail, while still emitting each intermediate state.
     *
     * **Example** (Scanning channel output with effects)
     *
     * ```ts
     * import { Channel, Data, Effect } from "effect"
     *
     * class ScanError extends Data.TaggedError("ScanError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4])
     *
     * // Effectful scan with async operations
     * const asyncScanChannel = Channel.scanEffect(
     *   numbersChannel,
     *   "",
     *   (acc, value) =>
     *     Effect.gen(function*() {
     *       // Simulate async work
     *       yield* Effect.sleep("10 millis")
     *       return acc + value.toString()
     *     })
     * )
     * // Outputs: "", "1", "12", "123", "1234"
     *
     * // Scan with error handling
     * const errorHandlingScan = Channel.scanEffect(
     *   numbersChannel,
     *   0,
     *   (sum, n) => {
     *     if (n < 0) {
     *       return Effect.fail(new ScanError({ reason: "negative number" }))
     *     }
     *     return Effect.succeed(sum + n)
     *   }
     * )
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, S, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, initial: S, f: (s: S, a: Types.NoInfer<OutElem>) => Effect.Effect<S, E, R>): Channel<S, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Catches any cause of failure from the channel and allows recovery by
 * creating a new channel based on the caught cause.
 *
 * **Example** (Recovering from failure causes)
 *
 * ```ts
 * import { Cause, Channel, Data } from "effect"
 *
 * class ProcessError extends Data.TaggedError("ProcessError")<{
 *   readonly reason: string
 * }> {}
 *
 * class RecoveryError extends Data.TaggedError("RecoveryError")<{
 *   readonly message: string
 * }> {}
 *
 * // Create a failing channel
 * const failingChannel = Channel.fail(
 *   new ProcessError({ reason: "network error" })
 * )
 *
 * // Catch the cause and provide recovery
 * const recoveredChannel = Channel.catchCause(failingChannel, (cause) => {
 *   if (Cause.hasFails(cause)) {
 *     return Channel.succeed("Recovered from failure")
 *   }
 *   return Channel.succeed("Recovered from interruption")
 * })
 *
 * // The channel recovers gracefully from errors
 * ```
 *
 * @category error handling
 * @since 2.0.0
 */
export declare const catchCause: {
    /**
     * Catches any cause of failure from the channel and allows recovery by
     * creating a new channel based on the caught cause.
     *
     * **Example** (Recovering from failure causes)
     *
     * ```ts
     * import { Cause, Channel, Data } from "effect"
     *
     * class ProcessError extends Data.TaggedError("ProcessError")<{
     *   readonly reason: string
     * }> {}
     *
     * class RecoveryError extends Data.TaggedError("RecoveryError")<{
     *   readonly message: string
     * }> {}
     *
     * // Create a failing channel
     * const failingChannel = Channel.fail(
     *   new ProcessError({ reason: "network error" })
     * )
     *
     * // Catch the cause and provide recovery
     * const recoveredChannel = Channel.catchCause(failingChannel, (cause) => {
     *   if (Cause.hasFails(cause)) {
     *     return Channel.succeed("Recovered from failure")
     *   }
     *   return Channel.succeed("Recovered from interruption")
     * })
     *
     * // The channel recovers gracefully from errors
     * ```
     *
     * @category error handling
     * @since 2.0.0
     */
    <OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (d: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
    /**
     * Catches any cause of failure from the channel and allows recovery by
     * creating a new channel based on the caught cause.
     *
     * **Example** (Recovering from failure causes)
     *
     * ```ts
     * import { Cause, Channel, Data } from "effect"
     *
     * class ProcessError extends Data.TaggedError("ProcessError")<{
     *   readonly reason: string
     * }> {}
     *
     * class RecoveryError extends Data.TaggedError("RecoveryError")<{
     *   readonly message: string
     * }> {}
     *
     * // Create a failing channel
     * const failingChannel = Channel.fail(
     *   new ProcessError({ reason: "network error" })
     * )
     *
     * // Catch the cause and provide recovery
     * const recoveredChannel = Channel.catchCause(failingChannel, (cause) => {
     *   if (Cause.hasFails(cause)) {
     *     return Channel.succeed("Recovered from failure")
     *   }
     *   return Channel.succeed("Recovered from interruption")
     * })
     *
     * // The channel recovers gracefully from errors
     * ```
     *
     * @category error handling
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
/**
 * Runs an effect with the full failure `Cause` when the channel fails, then
 * fails the returned channel with the original cause.
 *
 * **When to use**
 *
 * Use when observing the full channel failure `Cause` is needed without
 * changing successful output or replacing the original cause.
 *
 * **Details**
 *
 * Use this for observing failures, such as logging or metrics. If the observer
 * effect fails, that failure can fail the returned channel.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const tapCause: {
    /**
     * Runs an effect with the full failure `Cause` when the channel fails, then
     * fails the returned channel with the original cause.
     *
     * **When to use**
     *
     * Use when observing the full channel failure `Cause` is needed without
     * changing successful output or replacing the original cause.
     *
     * **Details**
     *
     * Use this for observing failures, such as logging or metrics. If the observer
     * effect fails, that failure can fail the returned channel.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, A, E, R>(f: (d: Cause.Cause<OutErr>) => Effect.Effect<A, E, R>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone | void, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect with the full failure `Cause` when the channel fails, then
     * fails the returned channel with the original cause.
     *
     * **When to use**
     *
     * Use when observing the full channel failure `Cause` is needed without
     * changing successful output or replacing the original cause.
     *
     * **Details**
     *
     * Use this for observing failures, such as logging or metrics. If the observer
     * effect fails, that failure can fail the returned channel.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: Cause.Cause<OutErr>) => Effect.Effect<A, E, R>): Channel<OutElem, OutErr | E, OutDone | void, InElem, InErr, InDone, Env | R>;
};
/**
 * Catches causes of failure that match a specific filter, allowing
 * conditional error recovery based on the type of failure.
 *
 * **When to use**
 *
 * Use to recover a channel only when its full `Cause` satisfies a boolean
 * predicate.
 *
 * **Details**
 *
 * When the predicate matches, the recovery function receives the original
 * cause. When it does not match, the returned channel fails with the original
 * cause.
 *
 * @see {@link catchCauseFilter} for selecting causes with a `Filter`
 * @see {@link catchCause} for recovering from every cause
 * @see {@link catchIf} for recovering from typed channel errors
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchCauseIf: {
    /**
     * Catches causes of failure that match a specific filter, allowing
     * conditional error recovery based on the type of failure.
     *
     * **When to use**
     *
     * Use to recover a channel only when its full `Cause` satisfies a boolean
     * predicate.
     *
     * **Details**
     *
     * When the predicate matches, the recovery function receives the original
     * cause. When it does not match, the returned channel fails with the original
     * cause.
     *
     * @see {@link catchCauseFilter} for selecting causes with a `Filter`
     * @see {@link catchCause} for recovering from every cause
     * @see {@link catchIf} for recovering from typed channel errors
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(predicate: Predicate.Predicate<Cause.Cause<OutErr>>, f: (cause: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
    /**
     * Catches causes of failure that match a specific filter, allowing
     * conditional error recovery based on the type of failure.
     *
     * **When to use**
     *
     * Use to recover a channel only when its full `Cause` satisfies a boolean
     * predicate.
     *
     * **Details**
     *
     * When the predicate matches, the recovery function receives the original
     * cause. When it does not match, the returned channel fails with the original
     * cause.
     *
     * @see {@link catchCauseFilter} for selecting causes with a `Filter`
     * @see {@link catchCause} for recovering from every cause
     * @see {@link catchIf} for recovering from typed channel errors
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: Predicate.Predicate<Cause.Cause<OutErr>>, f: (cause: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
/**
 * Recovers from channel failures whose full `Cause` is selected by a `Filter`.
 *
 * **When to use**
 *
 * Use when you need to recover a channel only from causes selected by a
 * `Filter`, while giving the recovery both the selected value and the original
 * `Cause`.
 *
 * **Details**
 *
 * When the filter succeeds, the recovery function receives the selected value
 * and the original cause. When the filter fails, the returned channel fails
 * with the residual cause produced by the filter.
 *
 * @see {@link catchCauseIf} for selecting causes with a predicate
 * @see {@link catchFilter} for selecting typed errors with a `Filter`
 * @see {@link catchCause} for recovering from every cause
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchCauseFilter: {
    /**
     * Recovers from channel failures whose full `Cause` is selected by a `Filter`.
     *
     * **When to use**
     *
     * Use when you need to recover a channel only from causes selected by a
     * `Filter`, while giving the recovery both the selected value and the original
     * `Cause`.
     *
     * **Details**
     *
     * When the filter succeeds, the recovery function receives the selected value
     * and the original cause. When the filter fails, the returned channel fails
     * with the residual cause produced by the filter.
     *
     * @see {@link catchCauseIf} for selecting causes with a predicate
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchCause} for recovering from every cause
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, EB, X extends Cause.Cause<any>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(filter: Filter.Filter<Cause.Cause<OutErr>, EB, X>, f: (failure: EB, cause: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, Cause.Cause.Error<X> | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
    /**
     * Recovers from channel failures whose full `Cause` is selected by a `Filter`.
     *
     * **When to use**
     *
     * Use when you need to recover a channel only from causes selected by a
     * `Filter`, while giving the recovery both the selected value and the original
     * `Cause`.
     *
     * **Details**
     *
     * When the filter succeeds, the recovery function receives the selected value
     * and the original cause. When the filter fails, the returned channel fails
     * with the residual cause produced by the filter.
     *
     * @see {@link catchCauseIf} for selecting causes with a predicate
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchCause} for recovering from every cause
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, EB, X extends Cause.Cause<any>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.Filter<Cause.Cause<OutErr>, EB, X>, f: (failure: EB, cause: Cause.Cause<OutErr>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, Cause.Cause.Error<X> | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
declare const catch_: {
    <OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (d: OutErr) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1, OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: OutErr) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>): Channel<OutElem | OutElem1, OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
export { 
/**
 * Recovers from typed channel errors by running a fallback channel.
 *
 * @category error handling
 * @since 4.0.0
 */
catch_ as catch };
/**
 * Runs an effect when the channel fails with a typed error, then preserves the
 * original channel failure.
 *
 * **Details**
 *
 * The effect is not run for normal channel completion. If the observer effect
 * fails, that failure can fail the returned channel.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const tapError: {
    /**
     * Runs an effect when the channel fails with a typed error, then preserves the
     * original channel failure.
     *
     * **Details**
     *
     * The effect is not run for normal channel completion. If the observer effect
     * fails, that failure can fail the returned channel.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, A, E, R>(f: (d: OutErr) => Effect.Effect<A, E, R>): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone | void, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect when the channel fails with a typed error, then preserves the
     * original channel failure.
     *
     * **Details**
     *
     * The effect is not run for normal channel completion. If the observer effect
     * fails, that failure can fail the returned channel.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: OutErr) => Effect.Effect<A, E, R>): Channel<OutElem, OutErr | E, OutDone | void, InElem, InErr, InDone, Env | R>;
};
/**
 * Recovers from typed channel errors that match a predicate or refinement.
 *
 * **When to use**
 *
 * Use to recover from typed channel errors when a predicate or refinement
 * selects the failures that should switch to a recovery channel.
 *
 * **Details**
 *
 * Matching errors are handled by the recovery function. Non-matching errors
 * are handled by `orElse` when provided. Without `orElse`, non-matching errors
 * are re-failed.
 *
 * @see {@link catch_ catch} for recovering from every typed channel error
 * @see {@link catchFilter} for selecting typed errors with a `Filter`
 * @see {@link catchTag} for selecting tagged typed errors
 * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchIf: {
    /**
     * Recovers from typed channel errors that match a predicate or refinement.
     *
     * **When to use**
     *
     * Use to recover from typed channel errors when a predicate or refinement
     * selects the failures that should switch to a recovery channel.
     *
     * **Details**
     *
     * Matching errors are handled by the recovery function. Non-matching errors
     * are handled by `orElse` when provided. Without `orElse`, non-matching errors
     * are re-failed.
     *
     * @see {@link catch_ catch} for recovering from every typed channel error
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, EB extends OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(refinement: Predicate.Refinement<OutErr, EB>, f: (failure: EB) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: Exclude<OutErr, EB>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Exclude<OutErr, EB> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Recovers from typed channel errors that match a predicate or refinement.
     *
     * **When to use**
     *
     * Use to recover from typed channel errors when a predicate or refinement
     * selects the failures that should switch to a recovery channel.
     *
     * **Details**
     *
     * Matching errors are handled by the recovery function. Non-matching errors
     * are handled by `orElse` when provided. Without `orElse`, non-matching errors
     * are re-failed.
     *
     * @see {@link catch_ catch} for recovering from every typed channel error
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(predicate: Predicate.Predicate<OutErr>, f: (failure: OutErr) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: OutErr) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? OutErr : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Recovers from typed channel errors that match a predicate or refinement.
     *
     * **When to use**
     *
     * Use to recover from typed channel errors when a predicate or refinement
     * selects the failures that should switch to a recovery channel.
     *
     * **Details**
     *
     * Matching errors are handled by the recovery function. Non-matching errors
     * are handled by `orElse` when provided. Without `orElse`, non-matching errors
     * are re-failed.
     *
     * @see {@link catch_ catch} for recovering from every typed channel error
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, EB extends OutErr, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, refinement: Predicate.Refinement<OutErr, EB>, f: (failure: EB) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: Exclude<OutErr, EB>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Exclude<OutErr, EB> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Recovers from typed channel errors that match a predicate or refinement.
     *
     * **When to use**
     *
     * Use to recover from typed channel errors when a predicate or refinement
     * selects the failures that should switch to a recovery channel.
     *
     * **Details**
     *
     * Matching errors are handled by the recovery function. Non-matching errors
     * are handled by `orElse` when provided. Without `orElse`, non-matching errors
     * are re-failed.
     *
     * @see {@link catch_ catch} for recovering from every typed channel error
     * @see {@link catchFilter} for selecting typed errors with a `Filter`
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, predicate: Predicate.Predicate<OutErr>, f: (failure: OutErr) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: OutErr) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? OutErr : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
};
/**
 * Recovers from typed channel errors selected by a `Filter`.
 *
 * **When to use**
 *
 * Use to recover from channel errors with a reusable `Filter` when matching
 * can also narrow or transform the error before choosing the recovery channel.
 *
 * **Details**
 *
 * Successful filter results are handled by the recovery function. Failed
 * filter results are handled by `orElse` when provided. Without `orElse`,
 * failed filter results are re-failed.
 *
 * @see {@link catchIf} for selecting typed errors with a predicate
 * @see {@link catchTag} for selecting tagged typed errors
 * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchFilter: {
    /**
     * Recovers from typed channel errors selected by a `Filter`.
     *
     * **When to use**
     *
     * Use to recover from channel errors with a reusable `Filter` when matching
     * can also narrow or transform the error before choosing the recovery channel.
     *
     * **Details**
     *
     * Successful filter results are handled by the recovery function. Failed
     * filter results are handled by `orElse` when provided. Without `orElse`,
     * failed filter results are re-failed.
     *
     * @see {@link catchIf} for selecting typed errors with a predicate
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, EB, X, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(filter: Filter.Filter<OutErr, EB, X>, f: (failure: EB) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: X) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? X : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Recovers from typed channel errors selected by a `Filter`.
     *
     * **When to use**
     *
     * Use to recover from channel errors with a reusable `Filter` when matching
     * can also narrow or transform the error before choosing the recovery channel.
     *
     * **Details**
     *
     * Successful filter results are handled by the recovery function. Failed
     * filter results are handled by `orElse` when provided. Without `orElse`,
     * failed filter results are re-failed.
     *
     * @see {@link catchIf} for selecting typed errors with a predicate
     * @see {@link catchTag} for selecting tagged typed errors
     * @see {@link catchCauseFilter} for selecting full causes with a `Filter`
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, EB, X, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, filter: Filter.Filter<OutErr, EB, X>, f: (failure: EB) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((failure: X) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? X : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
};
/**
 * Recovers from tagged channel errors whose `_tag` matches one or more tags.
 *
 * **Details**
 *
 * Matching tagged errors are handled by the recovery function. Non-matching
 * errors are handled by `orElse` when provided. Without `orElse`,
 * non-matching errors are re-failed.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchTag: {
    /**
     * Recovers from tagged channel errors whose `_tag` matches one or more tags.
     *
     * **Details**
     *
     * Matching tagged errors are handled by the recovery function. Non-matching
     * errors are handled by `orElse` when provided. Without `orElse`,
     * non-matching errors are re-failed.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, const K extends Types.Tags<OutErr> | Arr.NonEmptyReadonlyArray<Types.Tags<OutErr>>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(k: K, f: (e: Types.ExtractTag<NoInfer<OutErr>, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((e: Types.ExcludeTag<NoInfer<OutErr>, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExcludeTag<OutErr, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Recovers from tagged channel errors whose `_tag` matches one or more tags.
     *
     * **Details**
     *
     * Matching tagged errors are handled by the recovery function. Non-matching
     * errors are handled by `orElse` when provided. Without `orElse`,
     * non-matching errors are re-failed.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, const K extends Types.Tags<OutErr> | Arr.NonEmptyReadonlyArray<Types.Tags<OutErr>>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, k: K, f: (e: Types.ExtractTag<NoInfer<OutErr>, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((e: Types.ExcludeTag<NoInfer<OutErr>, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExcludeTag<OutErr, K extends Arr.NonEmptyReadonlyArray<string> ? K[number] : K> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
};
/**
 * Catches a specific reason within a tagged error.
 *
 * **Example** (Recovering from nested reasons)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class RateLimitError extends Data.TaggedError("RateLimitError")<{
 *   retryAfter: number
 * }> {}
 *
 * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
 *   limit: number
 * }> {}
 *
 * class AiError extends Data.TaggedError("AiError")<{
 *   reason: RateLimitError | QuotaExceededError
 * }> {}
 *
 * const channel = Channel.fail(
 *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
 * )
 *
 * const recovered = channel.pipe(
 *   Channel.catchReason("AiError", "RateLimitError", (reason) =>
 *     Channel.succeed(`retry: ${reason.retryAfter}`)
 *   )
 * )
 * ```
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchReason: {
    /**
     * Catches a specific reason within a tagged error.
     *
     * **Example** (Recovering from nested reasons)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class RateLimitError extends Data.TaggedError("RateLimitError")<{
     *   retryAfter: number
     * }> {}
     *
     * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
     *   limit: number
     * }> {}
     *
     * class AiError extends Data.TaggedError("AiError")<{
     *   reason: RateLimitError | QuotaExceededError
     * }> {}
     *
     * const channel = Channel.fail(
     *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
     * )
     *
     * const recovered = channel.pipe(
     *   Channel.catchReason("AiError", "RateLimitError", (reason) =>
     *     Channel.succeed(`retry: ${reason.retryAfter}`)
     *   )
     * )
     * ```
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutErr, K extends Types.Tags<OutErr>, RK extends Types.ReasonTags<Types.ExtractTag<Types.NoInfer<OutErr>, K>>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(errorTag: K, reasonTag: RK, f: (reason: Types.ExtractReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>, error: Types.NarrowReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((reason: Types.ExcludeReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>, error: Types.OmitReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, Types.ExcludeTag<OutErr, K> | OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExtractTag<OutErr, K> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
    /**
     * Catches a specific reason within a tagged error.
     *
     * **Example** (Recovering from nested reasons)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class RateLimitError extends Data.TaggedError("RateLimitError")<{
     *   retryAfter: number
     * }> {}
     *
     * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
     *   limit: number
     * }> {}
     *
     * class AiError extends Data.TaggedError("AiError")<{
     *   reason: RateLimitError | QuotaExceededError
     * }> {}
     *
     * const channel = Channel.fail(
     *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
     * )
     *
     * const recovered = channel.pipe(
     *   Channel.catchReason("AiError", "RateLimitError", (reason) =>
     *     Channel.succeed(`retry: ${reason.retryAfter}`)
     *   )
     * )
     * ```
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, K extends Types.Tags<OutErr>, RK extends Types.ReasonTags<Types.ExtractTag<Types.NoInfer<OutErr>, K>>, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, errorTag: K, reasonTag: RK, f: (reason: Types.ExtractReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>, error: Types.NarrowReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, orElse?: ((reason: Types.ExcludeReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>, error: Types.OmitReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | OutElem1 | Exclude<OutElem2, Types.unassigned>, Types.ExcludeTag<OutErr, K> | OutErr1 | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExtractTag<OutErr, K> : never), OutDone | OutDone1 | OutDone2, InElem & InElem1 & InElem2, InErr & InErr1 & InErr2, InDone & InDone1 & InDone2, Env | Env1 | Env2>;
};
/**
 * Catches multiple reasons within a tagged error using an object of handlers.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const catchReasons: {
    /**
     * Catches multiple reasons within a tagged error using an object of handlers.
     *
     * @category error handling
     * @since 4.0.0
     */
    <K extends Types.Tags<OutErr>, OutErr, Cases extends {
        [RK in Types.ReasonTags<Types.ExtractTag<Types.NoInfer<OutErr>, K>>]+?: (reason: Types.ExtractReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>, error: Types.NarrowReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, RK>) => Channel<any, any, any, any, any, any, any>;
    }, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(errorTag: K, cases: Cases, orElse?: ((reason: Types.ExcludeReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, Extract<keyof Cases, string>>, error: Types.OmitReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, Extract<keyof Cases, string>>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem | Exclude<OutElem2, Types.unassigned> | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<infer OutElem1, any, any, any, any, any, any> ? OutElem1 : never;
    }[keyof Cases], Types.ExcludeTag<OutErr, K> | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExtractTag<OutErr, K> : never) | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, infer OutErr1, any, any, any, any, any> ? OutErr1 : never;
    }[keyof Cases], OutDone | OutDone2 | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, infer OutDone1, any, any, any, any> ? OutDone1 : never;
    }[keyof Cases], InElem & InElem2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, infer InElem1, any, any, any> ? InElem1 : never;
    }[keyof Cases], InErr & InErr2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, infer InErr1, any, any> ? InErr1 : never;
    }[keyof Cases], InDone & InDone2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, any, infer InDone1, any> ? InDone1 : never;
    }[keyof Cases], Env | Env2 | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, any, any, infer Env1> ? Env1 : never;
    }[keyof Cases]>;
    /**
     * Catches multiple reasons within a tagged error using an object of handlers.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, K extends Types.Tags<OutErr>, Cases extends {
        [RK in Types.ReasonTags<Types.ExtractTag<OutErr, K>>]+?: (reason: Types.ExtractReason<Types.ExtractTag<OutErr, K>, RK>, error: Types.NarrowReason<Types.ExtractTag<OutErr, K>, RK>) => Channel<any, any, any, any, any, any, any>;
    }, OutElem2 = Types.unassigned, OutErr2 = never, OutDone2 = never, InElem2 = unknown, InErr2 = unknown, InDone2 = unknown, Env2 = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, errorTag: K, cases: Cases, orElse?: ((reason: Types.ExcludeReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, Extract<keyof Cases, string>>, error: Types.OmitReason<Types.ExtractTag<Types.NoInfer<OutErr>, K>, Extract<keyof Cases, string>>) => Channel<OutElem2, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>) | undefined): Channel<OutElem | Exclude<OutElem2, Types.unassigned> | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<infer OutElem1, any, any, any, any, any, any> ? OutElem1 : never;
    }[keyof Cases], Types.ExcludeTag<OutErr, K> | OutErr2 | (OutElem2 extends Types.unassigned ? Types.ExtractTag<OutErr, K> : never) | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, infer OutErr1, any, any, any, any, any> ? OutErr1 : never;
    }[keyof Cases], OutDone | OutDone2 | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, infer OutDone1, any, any, any, any> ? OutDone1 : never;
    }[keyof Cases], InElem & InElem2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, infer InElem1, any, any, any> ? InElem1 : never;
    }[keyof Cases], InErr & InErr2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, infer InErr1, any, any> ? InErr1 : never;
    }[keyof Cases], InDone & InDone2 & {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, any, infer InDone1, any> ? InDone1 : never;
    }[keyof Cases], Env | Env2 | {
        [RK in keyof Cases]: Cases[RK] extends (...args: Array<any>) => Channel<any, any, any, any, any, any, infer Env1> ? Env1 : never;
    }[keyof Cases]>;
};
/**
 * Promotes nested reason errors into the channel error, replacing the parent error.
 *
 * **Example** (Promoting nested reasons)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class RateLimitError extends Data.TaggedError("RateLimitError")<{
 *   retryAfter: number
 * }> {}
 *
 * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
 *   limit: number
 * }> {}
 *
 * class AiError extends Data.TaggedError("AiError")<{
 *   reason: RateLimitError | QuotaExceededError
 * }> {}
 *
 * const channel = Channel.fail(
 *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
 * )
 *
 * const unwrapped = channel.pipe(Channel.unwrapReason("AiError"))
 * ```
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const unwrapReason: {
    /**
     * Promotes nested reason errors into the channel error, replacing the parent error.
     *
     * **Example** (Promoting nested reasons)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class RateLimitError extends Data.TaggedError("RateLimitError")<{
     *   retryAfter: number
     * }> {}
     *
     * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
     *   limit: number
     * }> {}
     *
     * class AiError extends Data.TaggedError("AiError")<{
     *   reason: RateLimitError | QuotaExceededError
     * }> {}
     *
     * const channel = Channel.fail(
     *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
     * )
     *
     * const unwrapped = channel.pipe(Channel.unwrapReason("AiError"))
     * ```
     *
     * @category error handling
     * @since 4.0.0
     */
    <K extends TagsWithReason<OutErr>, OutErr>(errorTag: K): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, Types.ExcludeTag<OutErr, K> | Types.ReasonOf<Types.ExtractTag<OutErr, K>>, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Promotes nested reason errors into the channel error, replacing the parent error.
     *
     * **Example** (Promoting nested reasons)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class RateLimitError extends Data.TaggedError("RateLimitError")<{
     *   retryAfter: number
     * }> {}
     *
     * class QuotaExceededError extends Data.TaggedError("QuotaExceededError")<{
     *   limit: number
     * }> {}
     *
     * class AiError extends Data.TaggedError("AiError")<{
     *   reason: RateLimitError | QuotaExceededError
     * }> {}
     *
     * const channel = Channel.fail(
     *   new AiError({ reason: new RateLimitError({ retryAfter: 60 }) })
     * )
     *
     * const unwrapped = channel.pipe(Channel.unwrapReason("AiError"))
     * ```
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, K extends TagsWithReason<OutErr>>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, errorTag: K): Channel<OutElem, Types.ExcludeTag<OutErr, K> | Types.ReasonOf<Types.ExtractTag<OutErr, K>>, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Returns a new channel, which is the same as this one, except the failure
 * value of the returned channel is created by applying the specified function
 * to the failure value of this channel.
 *
 * @category error handling
 * @since 2.0.0
 */
export declare const mapError: {
    /**
     * Returns a new channel, which is the same as this one, except the failure
     * value of the returned channel is created by applying the specified function
     * to the failure value of this channel.
     *
     * @category error handling
     * @since 2.0.0
     */
    <OutErr, OutErr2>(f: (err: OutErr) => OutErr2): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr2, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Returns a new channel, which is the same as this one, except the failure
     * value of the returned channel is created by applying the specified function
     * to the failure value of this channel.
     *
     * @category error handling
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutErr2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (err: OutErr) => OutErr2): Channel<OutElem, OutErr2, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Converts all errors in the channel to defects (unrecoverable failures).
 * This is useful when you want to treat errors as programming errors.
 *
 * **Example** (Converting failures to defects)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class ValidationError extends Data.TaggedError("ValidationError")<{
 *   readonly field: string
 * }> {}
 *
 * // Create a channel that might fail
 * const failingChannel = Channel.fail(new ValidationError({ field: "email" }))
 *
 * // Convert failures to defects
 * const fatalChannel = Channel.orDie(failingChannel)
 *
 * // Any failure will now become a defect (uncaught exception)
 * ```
 *
 * @category error handling
 * @since 2.0.0
 */
export declare const orDie: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, never, OutDone, InElem, InErr, InDone, Env>;
/**
 * Ignores all errors in the channel, converting them to an empty channel.
 *
 * **Details**
 *
 * Use the `log` option to emit the full {@link Cause} when the channel fails.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const ignore: <Arg extends Channel<any, any, any, any, any, any, any> | {
    readonly log?: boolean | Severity | undefined;
} | undefined = {
    readonly log?: boolean | Severity | undefined;
}>(selfOrOptions: Arg, options?: {
    readonly log?: boolean | Severity | undefined;
} | undefined) => [Arg] extends [
    Channel<infer OutElem, infer _OutErr, infer OutDone, infer InElem, infer InErr, infer InDone, infer Env>
] ? Channel<OutElem, never, OutDone | void, InElem, InErr, InDone, Env> : <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, never, OutDone | void, InElem, InErr, InDone, Env>;
/**
 * Ignores all errors in the channel including defects, converting them to an empty channel.
 *
 * **When to use**
 *
 * Use when a channel should become best-effort and all failure causes, including
 * defects and interruptions, can be converted to empty output.
 *
 * **Details**
 *
 * Use the `log` option to emit the full {@link Cause} when the channel fails.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const ignoreCause: <Arg extends Channel<any, any, any, any, any, any, any> | {
    readonly log?: boolean | Severity | undefined;
} | undefined = {
    readonly log?: boolean | Severity | undefined;
}>(selfOrOptions: Arg, options?: {
    readonly log?: boolean | Severity | undefined;
} | undefined) => [Arg] extends [
    Channel<infer OutElem, infer _OutErr, infer OutDone, infer InElem, infer InErr, infer InDone, infer Env>
] ? Channel<OutElem, never, OutDone | void, InElem, InErr, InDone, Env> : <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, never, OutDone | void, InElem, InErr, InDone, Env>;
/**
 * Returns a new channel that retries this channel according to the specified
 * schedule whenever it fails.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const retry: {
    /**
     * Returns a new channel that retries this channel according to the specified
     * schedule whenever it fails.
     *
     * @category error handling
     * @since 4.0.0
     */
    <SO, OutErr, SE, SR>(schedule: Schedule.Schedule<SO, Types.NoInfer<OutErr>, SE, SR> | (($: <SO, SE, SR>(_: Schedule.Schedule<SO, Types.NoInfer<OutErr>, SE, SR>) => Schedule.Schedule<SO, OutErr, SE, SR>) => Schedule.Schedule<SO, Types.NoInfer<OutErr>, SE, SR>)): <OutElem, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>) => Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>;
    /**
     * Returns a new channel that retries this channel according to the specified
     * schedule whenever it fails.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, SO, SE, SR>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, schedule: Schedule.Schedule<SO, OutErr, SE, SR> | (($: <SO, SE, SR>(_: Schedule.Schedule<SO, Types.NoInfer<OutErr>, SE, SR>) => Schedule.Schedule<SO, OutErr, SE, SR>) => Schedule.Schedule<SO, Types.NoInfer<OutErr>, SE, SR>)): Channel<OutElem, OutErr | SE, OutDone, InElem, InErr, InDone, Env | SR>;
};
/**
 * Maps each output element to a channel and emits values from the most recent
 * active child channels.
 *
 * **Details**
 *
 * With the default concurrency of `1`, starting a new child channel interrupts
 * the previous child channel. Use `options.concurrency` to allow more active
 * child channels. The source channel's done value is preserved.
 *
 * **Example** (Switching mapped channels)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class SwitchError extends Data.TaggedError("SwitchError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel that outputs numbers
 * const numberChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Switch to new channels based on each value
 * const switchedChannel = Channel.switchMap(
 *   numberChannel,
 *   (n) => Channel.fromIterable([`value-${n}`])
 * )
 *
 * // Outputs: "value-1", "value-2", "value-3"
 * ```
 *
 * @category sequencing
 * @since 4.0.0
 */
export declare const switchMap: {
    /**
     * Maps each output element to a channel and emits values from the most recent
     * active child channels.
     *
     * **Details**
     *
     * With the default concurrency of `1`, starting a new child channel interrupts
     * the previous child channel. Use `options.concurrency` to allow more active
     * child channels. The source channel's done value is preserved.
     *
     * **Example** (Switching mapped channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class SwitchError extends Data.TaggedError("SwitchError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Switch to new channels based on each value
     * const switchedChannel = Channel.switchMap(
     *   numberChannel,
     *   (n) => Channel.fromIterable([`value-${n}`])
     * )
     *
     * // Outputs: "value-1", "value-2", "value-3"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(f: (d: OutElem) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem1, OutErr1 | OutErr, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Maps each output element to a channel and emits values from the most recent
     * active child channels.
     *
     * **Details**
     *
     * With the default concurrency of `1`, starting a new child channel interrupts
     * the previous child channel. Use `options.concurrency` to allow more active
     * child channels. The source channel's done value is preserved.
     *
     * **Example** (Switching mapped channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class SwitchError extends Data.TaggedError("SwitchError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create a channel that outputs numbers
     * const numberChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Switch to new channels based on each value
     * const switchedChannel = Channel.switchMap(
     *   numberChannel,
     *   (n) => Channel.fromIterable([`value-${n}`])
     * )
     *
     * // Outputs: "value-1", "value-2", "value-3"
     * ```
     *
     * @category sequencing
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, f: (d: OutElem) => Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): Channel<OutElem1, OutErr | OutErr1, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
/**
 * Merges multiple channels with specified concurrency and buffering options.
 *
 * **When to use**
 *
 * Use when channel outputs are themselves channels and multiple inner channels
 * should run with configured concurrency and buffering.
 *
 * **Example** (Merging nested channels)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class MergeAllError extends Data.TaggedError("MergeAllError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create channels that output other channels
 * const nestedChannels = Channel.fromIterable([
 *   Channel.fromIterable([1, 2]),
 *   Channel.fromIterable([3, 4]),
 *   Channel.fromIterable([5, 6])
 * ])
 *
 * // Merge all channels with bounded concurrency
 * const mergedChannel = Channel.mergeAll({
 *   concurrency: 2,
 *   bufferSize: 16
 * })(nestedChannels)
 *
 * // Outputs: 1, 2, 3, 4, 5, 6 (order may vary due to concurrency)
 * ```
 *
 * @category combining
 * @since 2.0.0
 */
export declare const mergeAll: {
    /**
     * Merges multiple channels with specified concurrency and buffering options.
     *
     * **When to use**
     *
     * Use when channel outputs are themselves channels and multiple inner channels
     * should run with configured concurrency and buffering.
     *
     * **Example** (Merging nested channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class MergeAllError extends Data.TaggedError("MergeAllError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create channels that output other channels
     * const nestedChannels = Channel.fromIterable([
     *   Channel.fromIterable([1, 2]),
     *   Channel.fromIterable([3, 4]),
     *   Channel.fromIterable([5, 6])
     * ])
     *
     * // Merge all channels with bounded concurrency
     * const mergedChannel = Channel.mergeAll({
     *   concurrency: 2,
     *   bufferSize: 16
     * })(nestedChannels)
     *
     * // Outputs: 1, 2, 3, 4, 5, 6 (order may vary due to concurrency)
     * ```
     *
     * @category combining
     * @since 2.0.0
     */
    (options: {
        readonly concurrency: number | "unbounded";
        readonly bufferSize?: number | undefined;
        readonly switch?: boolean | undefined;
    }): <OutElem, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutErr, OutDone, InElem, InErr, InDone, Env>(channels: Channel<Channel<OutElem, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr1 | OutErr, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Merges multiple channels with specified concurrency and buffering options.
     *
     * **When to use**
     *
     * Use when channel outputs are themselves channels and multiple inner channels
     * should run with configured concurrency and buffering.
     *
     * **Example** (Merging nested channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class MergeAllError extends Data.TaggedError("MergeAllError")<{
     *   readonly reason: string
     * }> {}
     *
     * // Create channels that output other channels
     * const nestedChannels = Channel.fromIterable([
     *   Channel.fromIterable([1, 2]),
     *   Channel.fromIterable([3, 4]),
     *   Channel.fromIterable([5, 6])
     * ])
     *
     * // Merge all channels with bounded concurrency
     * const mergedChannel = Channel.mergeAll({
     *   concurrency: 2,
     *   bufferSize: 16
     * })(nestedChannels)
     *
     * // Outputs: 1, 2, 3, 4, 5, 6 (order may vary due to concurrency)
     * ```
     *
     * @category combining
     * @since 2.0.0
     */
    <OutElem, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1, OutErr, OutDone, InElem, InErr, InDone, Env>(channels: Channel<Channel<OutElem, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, OutErr, OutDone, InElem, InErr, InDone, Env>, options: {
        readonly concurrency: number | "unbounded";
        readonly bufferSize?: number | undefined;
        readonly switch?: boolean | undefined;
    }): Channel<OutElem, OutErr1 | OutErr, OutDone, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
};
/**
 * Represents strategies for halting merged channels when one completes or fails.
 *
 * **Example** (Choosing merge halt strategies)
 *
 * ```ts
 * import type { Channel } from "effect"
 *
 * // Different halt strategies for channel merging
 * const leftFirst: Channel.HaltStrategy = "left" // Stop when left channel halts
 * const rightFirst: Channel.HaltStrategy = "right" // Stop when right channel halts
 * const both: Channel.HaltStrategy = "both" // Stop when both channels halt
 * const either: Channel.HaltStrategy = "either" // Stop when either channel halts
 * ```
 *
 * @category models
 * @since 4.0.0
 */
export type HaltStrategy = "left" | "right" | "both" | "either";
/**
 * Returns a new channel, which is the merge of this channel and the specified
 * channel.
 *
 * **Example** (Merging channels)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class MergeError extends Data.TaggedError("MergeError")<{
 *   readonly source: string
 * }> {}
 *
 * // Create two channels
 * const leftChannel = Channel.fromIterable([1, 2, 3])
 * const rightChannel = Channel.fromIterable(["a", "b", "c"])
 *
 * // Merge them with "either" halt strategy
 * const mergedChannel = Channel.merge(leftChannel, rightChannel, {
 *   haltStrategy: "either"
 * })
 *
 * // Outputs elements from both channels concurrently
 * // Order may vary: 1, "a", 2, "b", 3, "c"
 * ```
 *
 * @category combining
 * @since 4.0.0
 */
export declare const merge: {
    /**
     * Returns a new channel, which is the merge of this channel and the specified
     * channel.
     *
     * **Example** (Merging channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class MergeError extends Data.TaggedError("MergeError")<{
     *   readonly source: string
     * }> {}
     *
     * // Create two channels
     * const leftChannel = Channel.fromIterable([1, 2, 3])
     * const rightChannel = Channel.fromIterable(["a", "b", "c"])
     *
     * // Merge them with "either" halt strategy
     * const mergedChannel = Channel.merge(leftChannel, rightChannel, {
     *   haltStrategy: "either"
     * })
     *
     * // Outputs elements from both channels concurrently
     * // Order may vary: 1, "a", 2, "b", 3, "c"
     * ```
     *
     * @category combining
     * @since 4.0.0
     */
    <OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(right: Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly haltStrategy?: HaltStrategy | undefined;
    } | undefined): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(left: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem1 | OutElem, OutErr | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env1 | Env>;
    /**
     * Returns a new channel, which is the merge of this channel and the specified
     * channel.
     *
     * **Example** (Merging channels)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class MergeError extends Data.TaggedError("MergeError")<{
     *   readonly source: string
     * }> {}
     *
     * // Create two channels
     * const leftChannel = Channel.fromIterable([1, 2, 3])
     * const rightChannel = Channel.fromIterable(["a", "b", "c"])
     *
     * // Merge them with "either" halt strategy
     * const mergedChannel = Channel.merge(leftChannel, rightChannel, {
     *   haltStrategy: "either"
     * })
     *
     * // Outputs elements from both channels concurrently
     * // Order may vary: 1, "a", 2, "b", 3, "c"
     * ```
     *
     * @category combining
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>(left: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, right: Channel<OutElem1, OutErr1, OutDone1, InElem1, InErr1, InDone1, Env1>, options?: {
        readonly haltStrategy?: HaltStrategy | undefined;
    } | undefined): Channel<OutElem | OutElem1, OutErr | OutErr1, OutDone | OutDone1, InElem & InElem1, InErr & InErr1, InDone & InDone1, Env | Env1>;
};
/**
 * Runs an effect concurrently with a channel while emitting only the channel's
 * output elements.
 *
 * **When to use**
 *
 * Use when a side effect should run for the lifetime of a channel and only the
 * channel's output elements should be emitted.
 *
 * **Details**
 *
 * The effect's successful value is ignored. If the effect fails while the
 * channel is running, the returned channel fails with that error.
 *
 * @category combining
 * @since 4.0.0
 */
export declare const mergeEffect: {
    /**
     * Runs an effect concurrently with a channel while emitting only the channel's
     * output elements.
     *
     * **When to use**
     *
     * Use when a side effect should run for the lifetime of a channel and only the
     * channel's output elements should be emitted.
     *
     * **Details**
     *
     * The effect's successful value is ignored. If the effect fails while the
     * channel is running, the returned channel fails with that error.
     *
     * @category combining
     * @since 4.0.0
     */
    <X, E, R>(effect: Effect.Effect<X, E, R>): <OutElem, OutDone, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect concurrently with a channel while emitting only the channel's
     * output elements.
     *
     * **When to use**
     *
     * Use when a side effect should run for the lifetime of a channel and only the
     * channel's output elements should be emitted.
     *
     * **Details**
     *
     * The effect's successful value is ignored. If the effect fails while the
     * channel is running, the returned channel fails with that error.
     *
     * @category combining
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, X, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, effect: Effect.Effect<X, E, R>): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Splits upstream string chunks into lines, recognizing `\n`, `\r\n`, and
 * standalone `\r` as line terminators. The behavior matches
 * `String.linesIterator` regardless of how the input is chunked.
 *
 * **Details**
 *
 * A line terminator at the very end of the stream does **not** produce a
 * trailing empty line (consistent with `String.linesIterator`). Conversely,
 * if the stream ends without a terminator the final partial line is still
 * emitted.
 *
 * **Example** (Splitting string chunks into lines)
 *
 * ```ts
 * import { Effect, Stream } from "effect"
 *
 * Effect.runPromise(Effect.gen(function*() {
 *   const result = yield* Stream.runCollect(
 *     Stream.splitLines(Stream.make("hel", "lo\r\nwor", "ld\n"))
 *   )
 *   console.log(result)
 *   // [ 'hello', 'world' ]
 * }))
 * ```
 *
 * @category String manipulation
 * @since 2.0.0
 */
export declare const splitLines: <Err, Done>() => Channel<Arr.NonEmptyReadonlyArray<string>, Err, Done, Arr.NonEmptyReadonlyArray<string>, Err, Done>;
/**
 * Decodes incoming `Uint8Array` chunks into strings using `TextDecoder`.
 *
 * **Details**
 *
 * Input chunks are decoded with streaming enabled so multi-byte characters may
 * span `Uint8Array` boundaries. The optional `encoding` and `options` are
 * passed to `TextDecoder`.
 *
 * @category String manipulation
 * @since 4.0.0
 */
export declare const decodeText: <Err, Done>(encoding?: string, options?: TextDecoderOptions) => Channel<Arr.NonEmptyReadonlyArray<string>, Err, Done, Arr.NonEmptyReadonlyArray<Uint8Array>, Err, Done>;
/**
 * Encodes incoming string chunks into `Uint8Array` values using `TextEncoder`.
 *
 * **Details**
 *
 * Each string inside an emitted array is encoded independently.
 *
 * @category String manipulation
 * @since 4.0.0
 */
export declare const encodeText: <Err, Done>() => Channel<Arr.NonEmptyReadonlyArray<Uint8Array>, Err, Done, Arr.NonEmptyReadonlyArray<string>, Err, Done>;
/**
 * Returns a new channel that pipes the output of this channel into the
 * specified channel. The returned channel has the input type of this channel,
 * and the output type of the specified channel, terminating with the value of
 * the specified channel.
 *
 * **Example** (Piping one channel into another)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class PipeError extends Data.TaggedError("PipeError")<{
 *   readonly stage: string
 * }> {}
 *
 * // Create source and transform channels
 * const sourceChannel = Channel.fromIterable([1, 2, 3])
 * const transformChannel = Channel.map(sourceChannel, (n: number) => n * 2)
 *
 * // Pipe the source into the transform
 * const pipedChannel = Channel.pipeTo(sourceChannel, transformChannel)
 *
 * // Outputs: 2, 4, 6
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const pipeTo: {
    /**
     * Returns a new channel that pipes the output of this channel into the
     * specified channel. The returned channel has the input type of this channel,
     * and the output type of the specified channel, terminating with the value of
     * the specified channel.
     *
     * **Example** (Piping one channel into another)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class PipeError extends Data.TaggedError("PipeError")<{
     *   readonly stage: string
     * }> {}
     *
     * // Create source and transform channels
     * const sourceChannel = Channel.fromIterable([1, 2, 3])
     * const transformChannel = Channel.map(sourceChannel, (n: number) => n * 2)
     *
     * // Pipe the source into the transform
     * const pipedChannel = Channel.pipeTo(sourceChannel, transformChannel)
     *
     * // Outputs: 2, 4, 6
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem2, OutErr2, OutDone2, OutElem, OutErr, OutDone, Env2>(that: Channel<OutElem2, OutErr2, OutDone2, OutElem, OutErr, OutDone, Env2>): <InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem2, OutErr2, OutDone2, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Returns a new channel that pipes the output of this channel into the
     * specified channel. The returned channel has the input type of this channel,
     * and the output type of the specified channel, terminating with the value of
     * the specified channel.
     *
     * **Example** (Piping one channel into another)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class PipeError extends Data.TaggedError("PipeError")<{
     *   readonly stage: string
     * }> {}
     *
     * // Create source and transform channels
     * const sourceChannel = Channel.fromIterable([1, 2, 3])
     * const transformChannel = Channel.map(sourceChannel, (n: number) => n * 2)
     *
     * // Pipe the source into the transform
     * const pipedChannel = Channel.pipeTo(sourceChannel, transformChannel)
     *
     * // Outputs: 2, 4, 6
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem2, OutErr2, OutDone2, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, that: Channel<OutElem2, OutErr2, OutDone2, OutElem, OutErr, OutDone, Env2>): Channel<OutElem2, OutErr2, OutDone2, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Returns a new channel that pipes the output of this channel into the
 * specified channel and preserves this channel's failures without providing
 * them to the other channel for observation.
 *
 * **Example** (Piping while preserving failures)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class SourceError extends Data.TaggedError("SourceError")<{
 *   readonly code: number
 * }> {}
 *
 * // Create a failing source channel
 * const failingSource = Channel.fail(new SourceError({ code: 404 }))
 * const safeTransform = Channel.succeed("transformed")
 *
 * // Pipe while preserving source failures
 * const safePipedChannel = Channel.pipeToOrFail(failingSource, safeTransform)
 *
 * // Source errors are preserved and not sent to transform channel
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const pipeToOrFail: {
    /**
     * Returns a new channel that pipes the output of this channel into the
     * specified channel and preserves this channel's failures without providing
     * them to the other channel for observation.
     *
     * **Example** (Piping while preserving failures)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class SourceError extends Data.TaggedError("SourceError")<{
     *   readonly code: number
     * }> {}
     *
     * // Create a failing source channel
     * const failingSource = Channel.fail(new SourceError({ code: 404 }))
     * const safeTransform = Channel.succeed("transformed")
     *
     * // Pipe while preserving source failures
     * const safePipedChannel = Channel.pipeToOrFail(failingSource, safeTransform)
     *
     * // Source errors are preserved and not sent to transform channel
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem2, OutErr2, OutDone2, OutElem, OutDone, Env2>(that: Channel<OutElem2, OutErr2, OutDone2, OutElem, never, OutDone, Env2>): <OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem2, OutErr | OutErr2, OutDone2, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Returns a new channel that pipes the output of this channel into the
     * specified channel and preserves this channel's failures without providing
     * them to the other channel for observation.
     *
     * **Example** (Piping while preserving failures)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class SourceError extends Data.TaggedError("SourceError")<{
     *   readonly code: number
     * }> {}
     *
     * // Create a failing source channel
     * const failingSource = Channel.fail(new SourceError({ code: 404 }))
     * const safeTransform = Channel.succeed("transformed")
     *
     * // Pipe while preserving source failures
     * const safePipedChannel = Channel.pipeToOrFail(failingSource, safeTransform)
     *
     * // Source errors are preserved and not sent to transform channel
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutElem2, OutErr2, OutDone2, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, that: Channel<OutElem2, OutErr2, OutDone2, OutElem, never, OutDone, Env2>): Channel<OutElem2, OutErr | OutErr2, OutDone2, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Constructs a `Channel` from a scoped effect that will result in a
 * `Channel` if successful.
 *
 * **Example** (Unwrapping channel effects)
 *
 * ```ts
 * import { Channel, Data, Effect } from "effect"
 *
 * class UnwrapError extends Data.TaggedError("UnwrapError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create an effect that produces a channel
 * const channelEffect = Effect.succeed(
 *   Channel.fromIterable([1, 2, 3])
 * )
 *
 * // Unwrap the effect to get the channel
 * const unwrappedChannel = Channel.unwrap(channelEffect)
 *
 * // The resulting channel outputs: 1, 2, 3
 * ```
 *
 * @category constructors
 * @since 2.0.0
 */
export declare const unwrap: <OutElem, OutErr, OutDone, InElem, InErr, InDone, R2, E, R>(channel: Effect.Effect<Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, R2>, E, R>) => Channel<OutElem, E | OutErr, OutDone, InElem, InErr, InDone, Exclude<R, Scope.Scope> | R2>;
/**
 * Runs a channel with a scope provided for the duration of the channel
 * execution, removing the channel's `Scope` requirement.
 *
 * @category resource management
 * @since 2.0.0
 */
export declare const scoped: <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Exclude<Env, Scope.Scope>>;
/**
 * Runs an input handler against the upstream pull while the wrapped channel
 * runs without receiving upstream input directly.
 *
 * **Details**
 *
 * The input handler is forked in the channel scope. The wrapped channel is run
 * with an already-completed input.
 *
 * **Example** (Embedding custom input handling)
 *
 * ```ts
 * import { Channel, Effect } from "effect"
 *
 * // Create a base channel
 * const baseChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Drain the embedded input while the base channel runs
 * const embeddedChannel = Channel.embedInput(
 *   baseChannel,
 *   (upstream) =>
 *     upstream.pipe(
 *       Effect.tap((message) =>
 *         Effect.sync(() => console.log(message))
 *       ),
 *       Effect.forever,
 *       Effect.ignore
 *     )
 * )
 * ```
 *
 * @category sequencing
 * @since 2.0.0
 */
export declare const embedInput: {
    /**
     * Runs an input handler against the upstream pull while the wrapped channel
     * runs without receiving upstream input directly.
     *
     * **Details**
     *
     * The input handler is forked in the channel scope. The wrapped channel is run
     * with an already-completed input.
     *
     * **Example** (Embedding custom input handling)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * // Create a base channel
     * const baseChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Drain the embedded input while the base channel runs
     * const embeddedChannel = Channel.embedInput(
     *   baseChannel,
     *   (upstream) =>
     *     upstream.pipe(
     *       Effect.tap((message) =>
     *         Effect.sync(() => console.log(message))
     *       ),
     *       Effect.forever,
     *       Effect.ignore
     *     )
     * )
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <InElem, InErr, InDone, R>(input: (upstream: Pull.Pull<InElem, InErr, InDone>) => Effect.Effect<void, never, R>): <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an input handler against the upstream pull while the wrapped channel
     * runs without receiving upstream input directly.
     *
     * **Details**
     *
     * The input handler is forked in the channel scope. The wrapped channel is run
     * with an already-completed input.
     *
     * **Example** (Embedding custom input handling)
     *
     * ```ts
     * import { Channel, Effect } from "effect"
     *
     * // Create a base channel
     * const baseChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Drain the embedded input while the base channel runs
     * const embeddedChannel = Channel.embedInput(
     *   baseChannel,
     *   (upstream) =>
     *     upstream.pipe(
     *       Effect.tap((message) =>
     *         Effect.sync(() => console.log(message))
     *       ),
     *       Effect.forever,
     *       Effect.ignore
     *     )
     * )
     * ```
     *
     * @category sequencing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, Env, InErr, InElem, InDone, R>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, input: (upstream: Pull.Pull<InElem, InErr, InDone>) => Effect.Effect<void, never, R>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Buffers individual output elements in a queue with the configured `capacity`
 * so a faster producer can progress independently of a slower consumer.
 *
 * **When to use**
 *
 * Use when output elements can be decoupled from downstream demand and the
 * configured backpressure or loss strategy is acceptable.
 *
 * **Details**
 *
 * Finite queues use the `strategy` option. The default `"suspend"` strategy
 * applies backpressure, while `"dropping"` and `"sliding"` can discard output
 * elements when the queue is full. `"unbounded"` capacity does not use a finite
 * capacity strategy.
 *
 * **Gotchas**
 *
 * Dropping and sliding strategies can lose output elements under backpressure.
 *
 * @see {@link bufferArray} for buffering elements from array outputs
 *
 * @category Buffering
 * @since 2.0.0
 */
export declare const buffer: {
    /**
     * Buffers individual output elements in a queue with the configured `capacity`
     * so a faster producer can progress independently of a slower consumer.
     *
     * **When to use**
     *
     * Use when output elements can be decoupled from downstream demand and the
     * configured backpressure or loss strategy is acceptable.
     *
     * **Details**
     *
     * Finite queues use the `strategy` option. The default `"suspend"` strategy
     * applies backpressure, while `"dropping"` and `"sliding"` can discard output
     * elements when the queue is full. `"unbounded"` capacity does not use a finite
     * capacity strategy.
     *
     * **Gotchas**
     *
     * Dropping and sliding strategies can lose output elements under backpressure.
     *
     * @see {@link bufferArray} for buffering elements from array outputs
     *
     * @category Buffering
     * @since 2.0.0
     */
    (options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Buffers individual output elements in a queue with the configured `capacity`
     * so a faster producer can progress independently of a slower consumer.
     *
     * **When to use**
     *
     * Use when output elements can be decoupled from downstream demand and the
     * configured backpressure or loss strategy is acceptable.
     *
     * **Details**
     *
     * Finite queues use the `strategy` option. The default `"suspend"` strategy
     * applies backpressure, while `"dropping"` and `"sliding"` can discard output
     * elements when the queue is full. `"unbounded"` capacity does not use a finite
     * capacity strategy.
     *
     * **Gotchas**
     *
     * Dropping and sliding strategies can lose output elements under backpressure.
     *
     * @see {@link bufferArray} for buffering elements from array outputs
     *
     * @category Buffering
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Buffers array output elements in a queue with the configured `capacity` so a
 * faster producer can progress independently of a slower consumer.
 *
 * **When to use**
 *
 * Use when emitted arrays are batches of elements and it is acceptable for
 * buffering to flatten and rebuild those batches.
 *
 * **Details**
 *
 * Finite queues use the `strategy` option. The default `"suspend"` strategy
 * applies backpressure, while `"dropping"` and `"sliding"` can discard output
 * elements when the queue is full. `"unbounded"` capacity does not use a finite
 * capacity strategy.
 *
 * **Gotchas**
 *
 * Input arrays are offered to the queue element-by-element and outputs are
 * rebuilt from the currently available queued elements, so upstream array
 * boundaries are not preserved.
 *
 * @see {@link buffer} for buffering output elements without flattening arrays
 *
 * @category Buffering
 * @since 4.0.0
 */
export declare const bufferArray: {
    /**
     * Buffers array output elements in a queue with the configured `capacity` so a
     * faster producer can progress independently of a slower consumer.
     *
     * **When to use**
     *
     * Use when emitted arrays are batches of elements and it is acceptable for
     * buffering to flatten and rebuild those batches.
     *
     * **Details**
     *
     * Finite queues use the `strategy` option. The default `"suspend"` strategy
     * applies backpressure, while `"dropping"` and `"sliding"` can discard output
     * elements when the queue is full. `"unbounded"` capacity does not use a finite
     * capacity strategy.
     *
     * **Gotchas**
     *
     * Input arrays are offered to the queue element-by-element and outputs are
     * rebuilt from the currently available queued elements, so upstream array
     * boundaries are not preserved.
     *
     * @see {@link buffer} for buffering output elements without flattening arrays
     *
     * @category Buffering
     * @since 4.0.0
     */
    (options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Buffers array output elements in a queue with the configured `capacity` so a
     * faster producer can progress independently of a slower consumer.
     *
     * **When to use**
     *
     * Use when emitted arrays are batches of elements and it is acceptable for
     * buffering to flatten and rebuild those batches.
     *
     * **Details**
     *
     * Finite queues use the `strategy` option. The default `"suspend"` strategy
     * applies backpressure, while `"dropping"` and `"sliding"` can discard output
     * elements when the queue is full. `"unbounded"` capacity does not use a finite
     * capacity strategy.
     *
     * **Gotchas**
     *
     * Input arrays are offered to the queue element-by-element and outputs are
     * rebuilt from the currently available queued elements, so upstream array
     * boundaries are not preserved.
     *
     * @see {@link buffer} for buffering output elements without flattening arrays
     *
     * @category Buffering
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>, options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Interrupts a channel when another effect completes.
 *
 * **When to use**
 *
 * Use to race channel execution against an external effect whose success can
 * become the channel's done value.
 *
 * **Details**
 *
 * If the effect completes first, its success value becomes the returned
 * channel's done value. If the channel completes first, the original channel's
 * done value is preserved.
 *
 * @category interruption
 * @since 2.0.0
 */
export declare const interruptWhen: {
    /**
     * Interrupts a channel when another effect completes.
     *
     * **When to use**
     *
     * Use to race channel execution against an external effect whose success can
     * become the channel's done value.
     *
     * **Details**
     *
     * If the effect completes first, its success value becomes the returned
     * channel's done value. If the channel completes first, the original channel's
     * done value is preserved.
     *
     * @category interruption
     * @since 2.0.0
     */
    <OutDone2, OutErr2, Env2>(effect: Effect.Effect<OutDone2, OutErr2, Env2>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | OutErr2, OutDone | OutDone2, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Interrupts a channel when another effect completes.
     *
     * **When to use**
     *
     * Use to race channel execution against an external effect whose success can
     * become the channel's done value.
     *
     * **Details**
     *
     * If the effect completes first, its success value becomes the returned
     * channel's done value. If the channel completes first, the original channel's
     * done value is preserved.
     *
     * @category interruption
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutDone2, OutErr2, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, effect: Effect.Effect<OutDone2, OutErr2, Env2>): Channel<OutElem, OutErr | OutErr2, OutDone | OutDone2, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Stops a channel when the specified effect completes or fails.
 *
 * **Details**
 *
 * If the effect completes before the channel is done, its success value becomes
 * the returned channel's done value. If the effect fails, the returned channel
 * fails with that error. If the channel completes first, the channel's done
 * value is preserved.
 *
 * @category interruption
 * @since 4.0.0
 */
export declare const haltWhen: {
    /**
     * Stops a channel when the specified effect completes or fails.
     *
     * **Details**
     *
     * If the effect completes before the channel is done, its success value becomes
     * the returned channel's done value. If the effect fails, the returned channel
     * fails with that error. If the channel completes first, the channel's done
     * value is preserved.
     *
     * @category interruption
     * @since 4.0.0
     */
    <OutDone2, OutErr2, Env2>(effect: Effect.Effect<OutDone2, OutErr2, Env2>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | OutErr2, OutDone | OutDone2, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Stops a channel when the specified effect completes or fails.
     *
     * **Details**
     *
     * If the effect completes before the channel is done, its success value becomes
     * the returned channel's done value. If the effect fails, the returned channel
     * fails with that error. If the channel completes first, the channel's done
     * value is preserved.
     *
     * @category interruption
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, OutDone2, OutErr2, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, effect: Effect.Effect<OutDone2, OutErr2, Env2>): Channel<OutElem, OutErr | OutErr2, OutDone | OutDone2, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Attaches a finalizer that runs only when the channel exits with failure.
 *
 * **Details**
 *
 * The finalizer receives the failure `Cause`. The original channel failure is
 * preserved. The finalizer itself must not fail.
 *
 * @category error handling
 * @since 4.0.0
 */
export declare const onError: {
    /**
     * Attaches a finalizer that runs only when the channel exits with failure.
     *
     * **Details**
     *
     * The finalizer receives the failure `Cause`. The original channel failure is
     * preserved. The finalizer itself must not fail.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutDone, OutErr, Env2>(finalizer: (cause: Cause.Cause<OutErr>) => Effect.Effect<unknown, never, Env2>): <OutElem, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Attaches a finalizer that runs only when the channel exits with failure.
     *
     * **Details**
     *
     * The finalizer receives the failure `Cause`. The original channel failure is
     * preserved. The finalizer itself must not fail.
     *
     * @category error handling
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, finalizer: (cause: Cause.Cause<OutErr>) => Effect.Effect<unknown, never, Env2>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Returns a channel with an exit-aware finalizer that is guaranteed to run once
 * the channel begins execution, whether it succeeds or fails.
 *
 * **Example** (Running exit finalizers)
 *
 * ```ts
 * import { Channel, Console, Data, Exit } from "effect"
 *
 * class ExitError extends Data.TaggedError("ExitError")<{
 *   readonly stage: string
 * }> {}
 *
 * // Create a channel
 * const dataChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Attach exit handler
 * const channelWithExit = Channel.onExit(dataChannel, (exit) => {
 *   if (Exit.isSuccess(exit)) {
 *     return Console.log(`Channel completed successfully with: ${exit.value}`)
 *   } else {
 *     return Console.log(`Channel failed with: ${exit.cause}`)
 *   }
 * })
 * ```
 *
 * @category resource management
 * @since 4.0.0
 */
export declare const onExit: {
    /**
     * Returns a channel with an exit-aware finalizer that is guaranteed to run once
     * the channel begins execution, whether it succeeds or fails.
     *
     * **Example** (Running exit finalizers)
     *
     * ```ts
     * import { Channel, Console, Data, Exit } from "effect"
     *
     * class ExitError extends Data.TaggedError("ExitError")<{
     *   readonly stage: string
     * }> {}
     *
     * // Create a channel
     * const dataChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Attach exit handler
     * const channelWithExit = Channel.onExit(dataChannel, (exit) => {
     *   if (Exit.isSuccess(exit)) {
     *     return Console.log(`Channel completed successfully with: ${exit.value}`)
     *   } else {
     *     return Console.log(`Channel failed with: ${exit.cause}`)
     *   }
     * })
     * ```
     *
     * @category resource management
     * @since 4.0.0
     */
    <OutDone, OutErr, Env2>(finalizer: (e: Exit.Exit<OutDone, OutErr>) => Effect.Effect<unknown, never, Env2>): <OutElem, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Returns a channel with an exit-aware finalizer that is guaranteed to run once
     * the channel begins execution, whether it succeeds or fails.
     *
     * **Example** (Running exit finalizers)
     *
     * ```ts
     * import { Channel, Console, Data, Exit } from "effect"
     *
     * class ExitError extends Data.TaggedError("ExitError")<{
     *   readonly stage: string
     * }> {}
     *
     * // Create a channel
     * const dataChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Attach exit handler
     * const channelWithExit = Channel.onExit(dataChannel, (exit) => {
     *   if (Exit.isSuccess(exit)) {
     *     return Console.log(`Channel completed successfully with: ${exit.value}`)
     *   } else {
     *     return Console.log(`Channel failed with: ${exit.cause}`)
     *   }
     * })
     * ```
     *
     * @category resource management
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, finalizer: (e: Exit.Exit<OutDone, OutErr>) => Effect.Effect<unknown, never, Env2>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Runs an effect before the channel starts.
 *
 * **Details**
 *
 * The effect's successful value is ignored. If the effect fails, the returned
 * channel fails before running the source channel.
 *
 * @category hooks
 * @since 4.0.0
 */
export declare const onStart: {
    /**
     * Runs an effect before the channel starts.
     *
     * **Details**
     *
     * The effect's successful value is ignored. If the effect fails, the returned
     * channel fails before running the source channel.
     *
     * @category hooks
     * @since 4.0.0
     */
    <A, E, R>(onStart: Effect.Effect<A, E, R>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect before the channel starts.
     *
     * **Details**
     *
     * The effect's successful value is ignored. If the effect fails, the returned
     * channel fails before running the source channel.
     *
     * @category hooks
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, onStart: Effect.Effect<A, E, R>): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Runs an effect the first time the channel emits an output element.
 *
 * **When to use**
 *
 * Use when initialization depends on the first output element rather than only
 * on channel startup.
 *
 * **Details**
 *
 * The effect receives the first emitted element. The first element is still
 * emitted unchanged. The effect is not run if the channel completes without
 * emitting an element.
 *
 * @category hooks
 * @since 4.0.0
 */
export declare const onFirst: {
    /**
     * Runs an effect the first time the channel emits an output element.
     *
     * **When to use**
     *
     * Use when initialization depends on the first output element rather than only
     * on channel startup.
     *
     * **Details**
     *
     * The effect receives the first emitted element. The first element is still
     * emitted unchanged. The effect is not run if the channel completes without
     * emitting an element.
     *
     * @category hooks
     * @since 4.0.0
     */
    <OutElem, A, E, R>(onFirst: (element: Types.NoInfer<OutElem>) => Effect.Effect<A, E, R>): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect the first time the channel emits an output element.
     *
     * **When to use**
     *
     * Use when initialization depends on the first output element rather than only
     * on channel startup.
     *
     * **Details**
     *
     * The effect receives the first emitted element. The first element is still
     * emitted unchanged. The effect is not run if the channel completes without
     * emitting an element.
     *
     * @category hooks
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, onFirst: (element: Types.NoInfer<OutElem>) => Effect.Effect<A, E, R>): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Runs an effect when the channel completes successfully.
 *
 * **Details**
 *
 * The effect runs before the original done value is propagated. The effect is
 * not run when the channel fails. If the effect fails, the returned channel
 * fails with that error.
 *
 * @category hooks
 * @since 4.0.0
 */
export declare const onEnd: {
    /**
     * Runs an effect when the channel completes successfully.
     *
     * **Details**
     *
     * The effect runs before the original done value is propagated. The effect is
     * not run when the channel fails. If the effect fails, the returned channel
     * fails with that error.
     *
     * @category hooks
     * @since 4.0.0
     */
    <A, E, R>(onEnd: Effect.Effect<A, E, R>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
    /**
     * Runs an effect when the channel completes successfully.
     *
     * **Details**
     *
     * The effect runs before the original done value is propagated. The effect is
     * not run when the channel fails. If the effect fails, the returned channel
     * fails with that error.
     *
     * @category hooks
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, onEnd: Effect.Effect<A, E, R>): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Env | R>;
};
/**
 * Returns a channel with a finalizer effect that is guaranteed to run once the
 * channel begins execution, whether it succeeds or fails.
 *
 * **Example** (Ensuring cleanup runs)
 *
 * ```ts
 * import { Channel, Console, Data } from "effect"
 *
 * class EnsureError extends Data.TaggedError("EnsureError")<{
 *   readonly operation: string
 * }> {}
 *
 * // Create a channel
 * const dataChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Ensure cleanup always runs
 * const channelWithCleanup = Channel.ensuring(
 *   dataChannel,
 *   Console.log("Cleanup executed regardless of success or failure")
 * )
 * ```
 *
 * @category resource management
 * @since 2.0.0
 */
export declare const ensuring: {
    /**
     * Returns a channel with a finalizer effect that is guaranteed to run once the
     * channel begins execution, whether it succeeds or fails.
     *
     * **Example** (Ensuring cleanup runs)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class EnsureError extends Data.TaggedError("EnsureError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel
     * const dataChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Ensure cleanup always runs
     * const channelWithCleanup = Channel.ensuring(
     *   dataChannel,
     *   Console.log("Cleanup executed regardless of success or failure")
     * )
     * ```
     *
     * @category resource management
     * @since 2.0.0
     */
    <Env2>(finalizer: Effect.Effect<unknown, never, Env2>): <OutElem, OutDone, OutErr, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
    /**
     * Returns a channel with a finalizer effect that is guaranteed to run once the
     * channel begins execution, whether it succeeds or fails.
     *
     * **Example** (Ensuring cleanup runs)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class EnsureError extends Data.TaggedError("EnsureError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel
     * const dataChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Ensure cleanup always runs
     * const channelWithCleanup = Channel.ensuring(
     *   dataChannel,
     *   Console.log("Cleanup executed regardless of success or failure")
     * )
     * ```
     *
     * @category resource management
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, finalizer: Effect.Effect<unknown, never, Env2>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2 | Env>;
};
/**
 * Creates a channel from the specified services.
 *
 * @category services
 * @since 2.0.0
 */
export declare const contextWith: <Env, OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2>(f: (context: Context.Context<Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env2>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env | Env2>;
/**
 * Provides a `Context` to the channel, removing the corresponding service
 * requirements from the returned channel.
 *
 * @category services
 * @since 2.0.0
 */
export declare const provideContext: {
    /**
     * Provides a `Context` to the channel, removing the corresponding service
     * requirements from the returned channel.
     *
     * @category services
     * @since 2.0.0
     */
    <R2>(context: Context.Context<R2>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Exclude<Env, R2>>;
    /**
     * Provides a `Context` to the channel, removing the corresponding service
     * requirements from the returned channel.
     *
     * @category services
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, R2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, context: Context.Context<R2>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Exclude<Env, R2>>;
};
/**
 * Provides a concrete service for a context key, removing that service
 * requirement from the returned channel.
 *
 * @category services
 * @since 2.0.0
 */
export declare const provideService: {
    /**
     * Provides a concrete service for a context key, removing that service
     * requirement from the returned channel.
     *
     * @category services
     * @since 2.0.0
     */
    <I, S>(key: Context.Key<I, S>, service: NoInfer<S>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Exclude<Env, I>>;
    /**
     * Provides a concrete service for a context key, removing that service
     * requirement from the returned channel.
     *
     * @category services
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, I, S>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, key: Context.Key<I, S>, service: NoInfer<S>): Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Exclude<Env, I>>;
};
/**
 * Provides a service to the channel after obtaining it from an effect.
 *
 * **When to use**
 *
 * Use to supply a channel dependency when constructing the service itself is
 * effectful or can fail.
 *
 * **Details**
 *
 * If the service effect fails, the returned channel fails. The provided service
 * removes the corresponding service requirement from the returned channel.
 *
 * @category services
 * @since 4.0.0
 */
export declare const provideServiceEffect: {
    /**
     * Provides a service to the channel after obtaining it from an effect.
     *
     * **When to use**
     *
     * Use to supply a channel dependency when constructing the service itself is
     * effectful or can fail.
     *
     * **Details**
     *
     * If the service effect fails, the returned channel fails. The provided service
     * removes the corresponding service requirement from the returned channel.
     *
     * @category services
     * @since 4.0.0
     */
    <I, S, ES, RS>(key: Context.Key<I, S>, service: Effect.Effect<NoInfer<S>, ES, RS>): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | ES, OutDone, InElem, InErr, InDone, Exclude<Env, I> | RS>;
    /**
     * Provides a service to the channel after obtaining it from an effect.
     *
     * **When to use**
     *
     * Use to supply a channel dependency when constructing the service itself is
     * effectful or can fail.
     *
     * **Details**
     *
     * If the service effect fails, the returned channel fails. The provided service
     * removes the corresponding service requirement from the returned channel.
     *
     * @category services
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, I, S, ES, RS>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, key: Context.Key<I, S>, service: Effect.Effect<NoInfer<S>, ES, RS>): Channel<OutElem, OutErr | ES, OutDone, InElem, InErr, InDone, Exclude<Env, I> | RS>;
};
/**
 * Provides a `Layer` or `Context` to the channel, removing the corresponding
 * service requirements.
 *
 * **Details**
 *
 * Providing a `Context` delegates to `provideContext`. Providing a `Layer`
 * builds the layer in the channel scope. Use `options.local` to build a fresh
 * layer instance for this provision.
 *
 * @category services
 * @since 4.0.0
 */
export declare const provide: {
    /**
     * Provides a `Layer` or `Context` to the channel, removing the corresponding
     * service requirements.
     *
     * **Details**
     *
     * Providing a `Context` delegates to `provideContext`. Providing a `Layer`
     * builds the layer in the channel scope. Use `options.local` to build a fresh
     * layer instance for this provision.
     *
     * @category services
     * @since 4.0.0
     */
    <A, E = never, R = never>(layer: Layer.Layer<A, E, R> | Context.Context<A>, options?: {
        readonly local?: boolean | undefined;
    } | undefined): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Exclude<Env, A> | R>;
    /**
     * Provides a `Layer` or `Context` to the channel, removing the corresponding
     * service requirements.
     *
     * **Details**
     *
     * Providing a `Context` delegates to `provideContext`. Providing a `Layer`
     * builds the layer in the channel scope. Use `options.local` to build a fresh
     * layer instance for this provision.
     *
     * @category services
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, A, E = never, R = never>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, layer: Layer.Layer<A, E, R> | Context.Context<A>, options?: {
        readonly local?: boolean | undefined;
    } | undefined): Channel<OutElem, OutErr | E, OutDone, InElem, InErr, InDone, Exclude<Env, A> | R>;
};
/**
 * Transforms the current context before running the channel.
 *
 * **Details**
 *
 * The function receives the surrounding context and returns the context to
 * provide to the channel. The returned channel requires the services needed to
 * build that context.
 *
 * @category services
 * @since 4.0.0
 */
export declare const updateContext: {
    /**
     * Transforms the current context before running the channel.
     *
     * **Details**
     *
     * The function receives the surrounding context and returns the context to
     * provide to the channel. The returned channel requires the services needed to
     * build that context.
     *
     * @category services
     * @since 4.0.0
     */
    <Env, R2>(f: (context: Context.Context<R2>) => Context.Context<Env>): <OutElem, OutErr, OutDone, InElem, InErr, InDone>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env>) => Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, R2>;
    /**
     * Transforms the current context before running the channel.
     *
     * **Details**
     *
     * The function receives the surrounding context and returns the context to
     * provide to the channel. The returned channel requires the services needed to
     * build that context.
     *
     * @category services
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, R2>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env>, f: (context: Context.Context<R2>) => Context.Context<Env>): Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, R2>;
};
/**
 * Updates a service in the current context before running the channel.
 *
 * **Details**
 *
 * The existing service is read from the context. The updated service is
 * provided to the channel under the same key.
 *
 * @category services
 * @since 2.0.0
 */
export declare const updateService: {
    /**
     * Updates a service in the current context before running the channel.
     *
     * **Details**
     *
     * The existing service is read from the context. The updated service is
     * provided to the channel under the same key.
     *
     * @category services
     * @since 2.0.0
     */
    <I, S>(key: Context.Key<I, S>, f: (service: NoInfer<S>) => S): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env>) => Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env | I>;
    /**
     * Updates a service in the current context before running the channel.
     *
     * **Details**
     *
     * The existing service is read from the context. The updated service is
     * provided to the channel under the same key.
     *
     * @category services
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, I, S>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env>, service: Context.Key<I, S>, f: (service: NoInfer<S>) => S): Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Env | I>;
};
/**
 * Runs the channel inside a tracing span with the specified name and options.
 *
 * **Details**
 *
 * The created span is provided as the current parent span while the channel
 * runs. The span is ended with the channel's exit value.
 *
 * @category tracing
 * @since 2.0.0
 */
export declare const withSpan: {
    /**
     * Runs the channel inside a tracing span with the specified name and options.
     *
     * **Details**
     *
     * The created span is provided as the current parent span while the channel
     * runs. The span is ended with the channel's exit value.
     *
     * @category tracing
     * @since 2.0.0
     */
    (name: string, options?: SpanOptions): <OutElem, OutErr, OutDone, InElem, InErr, InDone, R>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, R>) => Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Exclude<R, ParentSpan>>;
    /**
     * Runs the channel inside a tracing span with the specified name and options.
     *
     * **Details**
     *
     * The created span is provided as the current parent span while the channel
     * runs. The span is ended with the channel's exit value.
     *
     * @category tracing
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, R>(self: Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, R>, name: string, options?: SpanOptions): Channel<OutElem, InElem, OutErr, InErr, OutDone, InDone, Exclude<R, ParentSpan>>;
};
/**
 * The starting channel for Do notation, emitting an empty object.
 *
 * @category do notation
 * @since 4.0.0
 */
export declare const Do: Channel<{}>;
declare const let_: {
    <N extends string, OutElem extends object, B>(name: Exclude<N, keyof OutElem>, f: (a: NoInfer<OutElem>) => B): <OutErr, OutDone, InElem, InErr, InDone, R>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, R>) => Channel<{
        [K in N | keyof OutElem]: K extends keyof OutElem ? OutElem[K] : B;
    }, OutErr, OutDone, InElem, InErr, InDone, R>;
    <OutElem extends object, OutErr, OutDone, InElem, InErr, InDone, R, N extends string, B>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, R>, name: Exclude<N, keyof OutElem>, f: (a: NoInfer<OutElem>) => B): Channel<{
        [K in N | keyof OutElem]: K extends keyof OutElem ? OutElem[K] : B;
    }, OutErr, OutDone, InElem, InErr, InDone, R>;
};
export { 
/**
 * Adds a computed field to each object emitted by a channel.
 *
 * @category do notation
 * @since 4.0.0
 */
let_ as let };
/**
 * Adds a field to each object emitted by a channel by running another channel
 * derived from that object.
 *
 * **Details**
 *
 * The field name must not already exist on the emitted object. The derived
 * channel's output becomes the value of the new field. `options.concurrency`
 * and `options.bufferSize` control how derived channels are flattened.
 *
 * @category do notation
 * @since 4.0.0
 */
export declare const bind: {
    /**
     * Adds a field to each object emitted by a channel by running another channel
     * derived from that object.
     *
     * **Details**
     *
     * The field name must not already exist on the emitted object. The derived
     * channel's output becomes the value of the new field. `options.concurrency`
     * and `options.bufferSize` control how derived channels are flattened.
     *
     * @category do notation
     * @since 4.0.0
     */
    <N extends string, OutElem extends object, B, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>(name: Exclude<N, keyof OutElem>, f: (a: NoInfer<OutElem>) => Channel<B, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): <OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<{
        [K in N | keyof OutElem]: K extends keyof OutElem ? OutElem[K] : B;
    }, OutErr2 | OutErr, OutDone, InElem & InElem2, InErr & InErr2, InDone & InDone2, Env2 | Env>;
    /**
     * Adds a field to each object emitted by a channel by running another channel
     * derived from that object.
     *
     * **Details**
     *
     * The field name must not already exist on the emitted object. The derived
     * channel's output becomes the value of the new field. `options.concurrency`
     * and `options.bufferSize` control how derived channels are flattened.
     *
     * @category do notation
     * @since 4.0.0
     */
    <OutElem extends object, OutErr, OutDone, InElem, InErr, InDone, Env, N extends string, B, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, name: Exclude<N, keyof OutElem>, f: (a: NoInfer<OutElem>) => Channel<B, OutErr2, OutDone2, InElem2, InErr2, InDone2, Env2>, options?: {
        readonly concurrency?: number | "unbounded" | undefined;
        readonly bufferSize?: number | undefined;
    }): Channel<{
        [K in N | keyof OutElem]: K extends keyof OutElem ? OutElem[K] : B;
    }, OutErr2 | OutErr, OutDone, InElem & InElem2, InErr & InErr2, InDone & InDone2, Env2 | Env>;
};
/**
 * Wraps each output element in an object under the specified field name.
 *
 * **When to use**
 *
 * Use when you need to start a Channel Do-notation chain from an existing
 * output value by assigning that value to a field name.
 *
 * @see {@link Do} for starting Do notation from an empty object
 * @see {@link bind} for adding a field produced by another channel
 * @see {@link let_ let} for adding a computed field
 *
 * @category do notation
 * @since 4.0.0
 */
export declare const bindTo: {
    /**
     * Wraps each output element in an object under the specified field name.
     *
     * **When to use**
     *
     * Use when you need to start a Channel Do-notation chain from an existing
     * output value by assigning that value to a field name.
     *
     * @see {@link Do} for starting Do notation from an empty object
     * @see {@link bind} for adding a field produced by another channel
     * @see {@link let_ let} for adding a computed field
     *
     * @category do notation
     * @since 4.0.0
     */
    <N extends string>(name: N): <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>) => Channel<{
        [K in N]: OutElem;
    }, OutErr, OutDone, InElem, InErr, InDone, Env>;
    /**
     * Wraps each output element in an object under the specified field name.
     *
     * **When to use**
     *
     * Use when you need to start a Channel Do-notation chain from an existing
     * output value by assigning that value to a field name.
     *
     * @see {@link Do} for starting Do notation from an empty object
     * @see {@link bind} for adding a field produced by another channel
     * @see {@link let_ let} for adding a computed field
     *
     * @category do notation
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, InElem, InErr, InDone, Env, N extends string>(self: Channel<OutElem, OutErr, OutDone, InElem, InErr, InDone, Env>, name: N): Channel<{
        [K in N]: OutElem;
    }, OutErr, OutDone, InElem, InErr, InDone, Env>;
};
/**
 * Runs a channel and counts the number of elements it outputs.
 *
 * **Example** (Counting channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class CountError extends Data.TaggedError("CountError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel with multiple elements
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Count the elements
 * const countEffect = Channel.runCount(numbersChannel)
 *
 * // Effect.runSync(countEffect) // Returns: 5
 * ```
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runCount: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<void, OutErr, Env>;
/**
 * Runs a channel and discards all output elements, returning only the final result.
 *
 * **Example** (Draining channel output at runtime)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class DrainError extends Data.TaggedError("DrainError")<{
 *   readonly stage: string
 * }> {}
 *
 * // Create a channel that outputs elements and completes with a result
 * const resultChannel = Channel.fromIterable([1, 2, 3])
 * const completedChannel = Channel.concatWith(
 *   resultChannel,
 *   () => Channel.succeed("completed")
 * )
 *
 * // Drain all elements and get only the final result
 * const drainEffect = Channel.runDrain(completedChannel)
 *
 * // Effect.runSync(drainEffect) // Returns: "completed"
 * ```
 *
 * @category execution
 * @since 2.0.0
 */
export declare const runDrain: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<OutDone, OutErr, Env>;
/**
 * Runs a channel and applies an effect to each output element.
 *
 * **Example** (Running effects for each output)
 *
 * ```ts
 * import { Channel, Console, Data } from "effect"
 *
 * class ForEachError extends Data.TaggedError("ForEachError")<{
 *   readonly element: unknown
 * }> {}
 *
 * // Create a channel with numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Run forEach to log each element
 * const forEachEffect = Channel.runForEach(
 *   numbersChannel,
 *   (n) => Console.log(`Processing: ${n}`)
 * )
 *
 * // Logs: "Processing: 1", "Processing: 2", "Processing: 3"
 * ```
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runForEach: {
    /**
     * Runs a channel and applies an effect to each output element.
     *
     * **Example** (Running effects for each output)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class ForEachError extends Data.TaggedError("ForEachError")<{
     *   readonly element: unknown
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Run forEach to log each element
     * const forEachEffect = Channel.runForEach(
     *   numbersChannel,
     *   (n) => Console.log(`Processing: ${n}`)
     * )
     *
     * // Logs: "Processing: 1", "Processing: 2", "Processing: 3"
     * ```
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, EX, RX>(f: (o: OutElem) => Effect.Effect<void, EX, RX>): <OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<OutDone, OutErr | EX, Env | RX>;
    /**
     * Runs a channel and applies an effect to each output element.
     *
     * **Example** (Running effects for each output)
     *
     * ```ts
     * import { Channel, Console, Data } from "effect"
     *
     * class ForEachError extends Data.TaggedError("ForEachError")<{
     *   readonly element: unknown
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3])
     *
     * // Run forEach to log each element
     * const forEachEffect = Channel.runForEach(
     *   numbersChannel,
     *   (n) => Console.log(`Processing: ${n}`)
     * )
     *
     * // Logs: "Processing: 1", "Processing: 2", "Processing: 3"
     * ```
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env, EX, RX>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, f: (o: OutElem) => Effect.Effect<void, EX, RX>): Effect.Effect<OutDone, OutErr | EX, Env | RX>;
};
/**
 * Runs a channel and applies an effectful predicate to each output element
 * until the predicate returns `false`.
 *
 * **Details**
 *
 * Returning `true` continues consuming the channel. Returning `false` stops
 * consumption early. The returned effect completes with `void`.
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runForEachWhile: {
    /**
     * Runs a channel and applies an effectful predicate to each output element
     * until the predicate returns `false`.
     *
     * **Details**
     *
     * Returning `true` continues consuming the channel. Returning `false` stops
     * consumption early. The returned effect completes with `void`.
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, EX, RX>(f: (o: OutElem) => Effect.Effect<boolean, EX, RX>): <OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<void, OutErr | EX, Env | RX>;
    /**
     * Runs a channel and applies an effectful predicate to each output element
     * until the predicate returns `false`.
     *
     * **Details**
     *
     * Returning `true` continues consuming the channel. Returning `false` stops
     * consumption early. The returned effect completes with `void`.
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env, EX, RX>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, f: (o: OutElem) => Effect.Effect<boolean, EX, RX>): Effect.Effect<void, OutErr | EX, Env | RX>;
};
/**
 * Runs a channel and collects all output elements into an array.
 *
 * **Example** (Collecting channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class CollectError extends Data.TaggedError("CollectError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel with elements
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Collect all elements into an array
 * const collectEffect = Channel.runCollect(numbersChannel)
 *
 * // Effect.runSync(collectEffect) // Returns: [1, 2, 3, 4, 5]
 * ```
 *
 * @category execution
 * @since 2.0.0
 */
export declare const runCollect: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Array<OutElem>, OutErr, Env>;
/**
 * Runs a channel and outputs the done value.
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runDone: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<OutDone, OutErr, Env>;
/**
 * Runs a channel until the first output element is available, returning it in
 * an `Option`.
 *
 * **Details**
 *
 * Returns `Option.some` with the first output element, or `Option.none` if the
 * channel completes without emitting output.
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runHead: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Option.Option<OutElem>, OutErr, Env>;
/**
 * Runs a channel to completion and returns the last output element in an
 * `Option`.
 *
 * **Details**
 *
 * Returns `Option.some` with the last emitted element, or `Option.none` if the
 * channel completes without emitting output.
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runLast: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Option.Option<OutElem>, OutErr, Env>;
/**
 * Runs a channel and folds over all output elements with an accumulator.
 *
 * **Example** (Folding channel output)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class FoldError extends Data.TaggedError("FoldError")<{
 *   readonly operation: string
 * }> {}
 *
 * // Create a channel with numbers
 * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Fold to calculate sum
 * const sumEffect = Channel.runFold(numbersChannel, () => 0, (acc, n) => acc + n)
 *
 * // Effect.runSync(sumEffect) // Returns: 15
 * ```
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runFold: {
    /**
     * Runs a channel and folds over all output elements with an accumulator.
     *
     * **Example** (Folding channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class FoldError extends Data.TaggedError("FoldError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Fold to calculate sum
     * const sumEffect = Channel.runFold(numbersChannel, () => 0, (acc, n) => acc + n)
     *
     * // Effect.runSync(sumEffect) // Returns: 15
     * ```
     *
     * @category execution
     * @since 4.0.0
     */
    <Z, OutElem>(initial: LazyArg<Z>, f: (acc: Z, o: OutElem) => Z): <OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Z, OutErr, Env>;
    /**
     * Runs a channel and folds over all output elements with an accumulator.
     *
     * **Example** (Folding channel output)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class FoldError extends Data.TaggedError("FoldError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel with numbers
     * const numbersChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Fold to calculate sum
     * const sumEffect = Channel.runFold(numbersChannel, () => 0, (acc, n) => acc + n)
     *
     * // Effect.runSync(sumEffect) // Returns: 15
     * ```
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env, Z>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, initial: LazyArg<Z>, f: (acc: Z, o: OutElem) => Z): Effect.Effect<Z, OutErr, Env>;
};
/**
 * Runs a channel and effectfully folds all output elements with an accumulator.
 *
 * **When to use**
 *
 * Use when folding channel output needs effects, services, or an additional
 * failure channel during accumulation.
 *
 * **Details**
 *
 * The initial accumulator is evaluated lazily. Each output element is passed to
 * the effectful accumulator function. The returned effect succeeds with the
 * final accumulator value.
 *
 * @category execution
 * @since 4.0.0
 */
export declare const runFoldEffect: {
    /**
     * Runs a channel and effectfully folds all output elements with an accumulator.
     *
     * **When to use**
     *
     * Use when folding channel output needs effects, services, or an additional
     * failure channel during accumulation.
     *
     * **Details**
     *
     * The initial accumulator is evaluated lazily. Each output element is passed to
     * the effectful accumulator function. The returned effect succeeds with the
     * final accumulator value.
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, Z, E, R>(initial: LazyArg<Z>, f: (acc: Z, o: OutElem) => Effect.Effect<Z, E, R>): <OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Z, OutErr | E, Env | R>;
    /**
     * Runs a channel and effectfully folds all output elements with an accumulator.
     *
     * **When to use**
     *
     * Use when folding channel output needs effects, services, or an additional
     * failure channel during accumulation.
     *
     * **Details**
     *
     * The initial accumulator is evaluated lazily. Each output element is passed to
     * the effectful accumulator function. The returned effect succeeds with the
     * final accumulator value.
     *
     * @category execution
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env, Z, E, R>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, initial: LazyArg<Z>, f: (acc: Z, o: OutElem) => Effect.Effect<Z, E, R>): Effect.Effect<Z, OutErr | E, Env | R>;
};
/**
 * Converts a channel to a scoped `Pull` for low-level consumption.
 *
 * **Details**
 *
 * The effect requires a `Scope`. The returned pull should be consumed only
 * while that scope remains open. Pulls are serialized so only one pull is
 * evaluated at a time.
 *
 * **Example** (Converting channels to pulls)
 *
 * ```ts
 * import { Channel, Data, Effect } from "effect"
 *
 * class PullError extends Data.TaggedError("PullError")<{
 *   readonly step: string
 * }> {}
 *
 * // Create a channel
 * const numbersChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Convert to Pull within a scope
 * const pullEffect = Effect.scoped(
 *   Channel.toPull(numbersChannel)
 * )
 *
 * // Use the Pull to manually consume elements
 * ```
 *
 * @category destructors
 * @since 2.0.0
 */
export declare const toPull: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone>, never, Env | Scope.Scope>;
/**
 * Converts a channel to a Pull within an existing scope.
 *
 * **Example** (Converting channels to scoped pulls)
 *
 * ```ts
 * import { Channel, Data, Effect, Scope } from "effect"
 *
 * class ScopedPullError extends Data.TaggedError("ScopedPullError")<{
 *   readonly reason: string
 * }> {}
 *
 * // Create a channel
 * const numbersChannel = Channel.fromIterable([1, 2, 3])
 *
 * // Convert to Pull with explicit scope
 * const scopedPullEffect = Effect.gen(function*() {
 *   const scope = yield* Scope.make()
 *   const pull = yield* Channel.toPullScoped(numbersChannel, scope)
 *   return pull
 * })
 * ```
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const toPullScoped: <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, scope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, Env>, never, Env>;
/**
 * Runs a channel and offers each output element into a queue.
 *
 * **Details**
 *
 * When the channel completes, the queue is ended. When the channel fails, the
 * queue is failed with the channel's cause. The returned effect itself
 * completes with `void`.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const runIntoQueue: {
    /**
     * Runs a channel and offers each output element into a queue.
     *
     * **Details**
     *
     * When the channel completes, the queue is ended. When the channel fails, the
     * queue is failed with the channel's cause. The returned effect itself
     * completes with `void`.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr>(queue: Queue.Queue<OutElem, OutErr | Cause.Done>): <OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<void, never, Env>;
    /**
     * Runs a channel and offers each output element into a queue.
     *
     * **Details**
     *
     * When the channel completes, the queue is ended. When the channel fails, the
     * queue is failed with the channel's cause. The returned effect itself
     * completes with `void`.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, queue: Queue.Queue<OutElem, OutErr | Cause.Done>): Effect.Effect<void, never, Env>;
};
/**
 * Runs a channel that emits non-empty arrays and offers each array element into
 * a queue.
 *
 * **Details**
 *
 * When the channel completes, the queue is ended. When the channel fails, the
 * queue is failed with the channel's cause. The returned effect itself
 * completes with `void`.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const runIntoQueueArray: {
    /**
     * Runs a channel that emits non-empty arrays and offers each array element into
     * a queue.
     *
     * **Details**
     *
     * When the channel completes, the queue is ended. When the channel fails, the
     * queue is failed with the channel's cause. The returned effect itself
     * completes with `void`.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr>(queue: Queue.Queue<OutElem, OutErr | Cause.Done>): <OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<void, never, Env>;
    /**
     * Runs a channel that emits non-empty arrays and offers each array element into
     * a queue.
     *
     * **Details**
     *
     * When the channel completes, the queue is ended. When the channel fails, the
     * queue is failed with the channel's cause. The returned effect itself
     * completes with `void`.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>, queue: Queue.Queue<OutElem, OutErr | Cause.Done>): Effect.Effect<void, never, Env>;
};
/**
 * Creates a scoped queue and forks the channel to feed it for concurrent
 * consumption.
 *
 * **Details**
 *
 * Output elements are offered to the queue. Channel completion and failure are
 * signaled through the queue. The queue is shut down when the surrounding scope
 * closes.
 *
 * **Example** (Converting channels to queues)
 *
 * ```ts
 * import { Channel, Data } from "effect"
 *
 * class QueueError extends Data.TaggedError("QueueError")<{
 *   readonly operation: string
 * }> {}
 *
 * // Create a channel with data
 * const dataChannel = Channel.fromIterable([1, 2, 3, 4, 5])
 *
 * // Convert to queue for concurrent processing
 * const queueEffect = Channel.toQueue(dataChannel, { capacity: 32 })
 *
 * // The queue can be used for concurrent consumption
 * // Multiple consumers can read from the queue
 * ```
 *
 * @category destructors
 * @since 2.0.0
 */
export declare const toQueue: {
    /**
     * Creates a scoped queue and forks the channel to feed it for concurrent
     * consumption.
     *
     * **Details**
     *
     * Output elements are offered to the queue. Channel completion and failure are
     * signaled through the queue. The queue is shut down when the surrounding scope
     * closes.
     *
     * **Example** (Converting channels to queues)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class QueueError extends Data.TaggedError("QueueError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel with data
     * const dataChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Convert to queue for concurrent processing
     * const queueEffect = Channel.toQueue(dataChannel, { capacity: 32 })
     *
     * // The queue can be used for concurrent consumption
     * // Multiple consumers can read from the queue
     * ```
     *
     * @category destructors
     * @since 2.0.0
     */
    (options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Queue.Dequeue<OutElem, OutErr | Cause.Done>, never, Env | Scope.Scope>;
    /**
     * Creates a scoped queue and forks the channel to feed it for concurrent
     * consumption.
     *
     * **Details**
     *
     * Output elements are offered to the queue. Channel completion and failure are
     * signaled through the queue. The queue is shut down when the surrounding scope
     * closes.
     *
     * **Example** (Converting channels to queues)
     *
     * ```ts
     * import { Channel, Data } from "effect"
     *
     * class QueueError extends Data.TaggedError("QueueError")<{
     *   readonly operation: string
     * }> {}
     *
     * // Create a channel with data
     * const dataChannel = Channel.fromIterable([1, 2, 3, 4, 5])
     *
     * // Convert to queue for concurrent processing
     * const queueEffect = Channel.toQueue(dataChannel, { capacity: 32 })
     *
     * // The queue can be used for concurrent consumption
     * // Multiple consumers can read from the queue
     * ```
     *
     * @category destructors
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): Effect.Effect<Queue.Dequeue<OutElem, OutErr | Cause.Done>, never, Env | Scope.Scope>;
};
/**
 * Creates a scoped queue and forks an array-emitting channel to feed it.
 *
 * **Details**
 *
 * Each element inside emitted non-empty arrays is offered to the queue. Channel
 * completion and failure are signaled through the queue. The queue is shut down
 * when the surrounding scope closes.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const toQueueArray: {
    /**
     * Creates a scoped queue and forks an array-emitting channel to feed it.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is offered to the queue. Channel
     * completion and failure are signaled through the queue. The queue is shut down
     * when the surrounding scope closes.
     *
     * @category destructors
     * @since 4.0.0
     */
    (options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<Queue.Dequeue<OutElem, OutErr | Cause.Done>, never, Env | Scope.Scope>;
    /**
     * Creates a scoped queue and forks an array-emitting channel to feed it.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is offered to the queue. Channel
     * completion and failure are signaled through the queue. The queue is shut down
     * when the surrounding scope closes.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>, options: {
        readonly capacity: "unbounded";
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
    }): Effect.Effect<Queue.Dequeue<OutElem, OutErr | Cause.Done>, never, Env | Scope.Scope>;
};
/**
 * Converts a channel to a PubSub for concurrent consumption.
 *
 * **Details**
 *
 * `shutdownOnEnd` indicates whether the PubSub should be shut down when the
 * channel ends. By default this is `true`.
 *
 * @category destructors
 * @since 2.0.0
 */
export declare const toPubSub: {
    /**
     * Converts a channel to a PubSub for concurrent consumption.
     *
     * **Details**
     *
     * `shutdownOnEnd` indicates whether the PubSub should be shut down when the
     * channel ends. By default this is `true`.
     *
     * @category destructors
     * @since 2.0.0
     */
    (options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    }): <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<PubSub.PubSub<OutElem>, never, Env | Scope.Scope>;
    /**
     * Converts a channel to a PubSub for concurrent consumption.
     *
     * **Details**
     *
     * `shutdownOnEnd` indicates whether the PubSub should be shut down when the
     * channel ends. By default this is `true`.
     *
     * @category destructors
     * @since 2.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    }): Effect.Effect<PubSub.PubSub<OutElem>, never, Env | Scope.Scope>;
};
/**
 * Runs a channel and publishes each output element to a `PubSub`.
 *
 * **Details**
 *
 * The channel's output values are published as individual PubSub messages. Use
 * `options.shutdownOnEnd` to shut down the PubSub when channel execution ends.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const runIntoPubSub: {
    /**
     * Runs a channel and publishes each output element to a `PubSub`.
     *
     * **Details**
     *
     * The channel's output values are published as individual PubSub messages. Use
     * `options.shutdownOnEnd` to shut down the PubSub when channel execution ends.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem>(pubsub: PubSub.PubSub<OutElem>, options?: {
        readonly shutdownOnEnd?: boolean | undefined;
    } | undefined): <OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<void, never, Env>;
    /**
     * Runs a channel and publishes each output element to a `PubSub`.
     *
     * **Details**
     *
     * The channel's output values are published as individual PubSub messages. Use
     * `options.shutdownOnEnd` to shut down the PubSub when channel execution ends.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<OutElem, OutErr, OutDone, unknown, unknown, unknown, Env>, pubsub: PubSub.PubSub<OutElem>, options?: {
        readonly shutdownOnEnd?: boolean | undefined;
    } | undefined): Effect.Effect<void, never, Env>;
};
/**
 * Converts an array-emitting channel to a scoped `PubSub` for concurrent
 * consumption.
 *
 * **Details**
 *
 * Each element inside emitted non-empty arrays is published as an individual
 * PubSub message. `shutdownOnEnd` indicates whether the PubSub should be shut
 * down when the channel ends. By default this is `true`.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const toPubSubArray: {
    /**
     * Converts an array-emitting channel to a scoped `PubSub` for concurrent
     * consumption.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is published as an individual
     * PubSub message. `shutdownOnEnd` indicates whether the PubSub should be shut
     * down when the channel ends. By default this is `true`.
     *
     * @category destructors
     * @since 4.0.0
     */
    (options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    }): <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<PubSub.PubSub<OutElem>, never, Env | Scope.Scope>;
    /**
     * Converts an array-emitting channel to a scoped `PubSub` for concurrent
     * consumption.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is published as an individual
     * PubSub message. `shutdownOnEnd` indicates whether the PubSub should be shut
     * down when the channel ends. By default this is `true`.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>, options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
        readonly shutdownOnEnd?: boolean | undefined;
    }): Effect.Effect<PubSub.PubSub<OutElem>, never, Env | Scope.Scope>;
};
/**
 * Runs an array-emitting channel and publishes each array element to a
 * `PubSub`.
 *
 * **Details**
 *
 * Each element inside emitted non-empty arrays is published as an individual
 * PubSub message. Use `options.shutdownOnEnd` to shut down the PubSub when
 * channel execution ends.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const runIntoPubSubArray: {
    /**
     * Runs an array-emitting channel and publishes each array element to a
     * `PubSub`.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is published as an individual
     * PubSub message. Use `options.shutdownOnEnd` to shut down the PubSub when
     * channel execution ends.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem>(pubsub: PubSub.PubSub<OutElem>, options?: {
        readonly shutdownOnEnd?: boolean | undefined;
    } | undefined): <OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<OutDone, OutErr, Env>;
    /**
     * Runs an array-emitting channel and publishes each array element to a
     * `PubSub`.
     *
     * **Details**
     *
     * Each element inside emitted non-empty arrays is published as an individual
     * PubSub message. Use `options.shutdownOnEnd` to shut down the PubSub when
     * channel execution ends.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>, pubsub: PubSub.PubSub<OutElem>, options?: {
        readonly shutdownOnEnd?: boolean | undefined;
    } | undefined): Effect.Effect<OutDone, OutErr, Env>;
};
/**
 * Converts a channel to a scoped `PubSub` of `Take` values.
 *
 * **Details**
 *
 * Emitted non-empty arrays are published as output `Take` values. When the
 * channel ends, its final `Exit` is published so subscribers can observe
 * completion or failure.
 *
 * @category destructors
 * @since 4.0.0
 */
export declare const toPubSubTake: {
    /**
     * Converts a channel to a scoped `PubSub` of `Take` values.
     *
     * **Details**
     *
     * Emitted non-empty arrays are published as output `Take` values. When the
     * channel ends, its final `Exit` is published so subscribers can observe
     * completion or failure.
     *
     * @category destructors
     * @since 4.0.0
     */
    (options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
    }): <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutDone>, OutErr, OutDone, unknown, unknown, unknown, Env>) => Effect.Effect<PubSub.PubSub<Take.Take<OutElem, OutErr, OutDone>>, never, Env | Scope.Scope>;
    /**
     * Converts a channel to a scoped `PubSub` of `Take` values.
     *
     * **Details**
     *
     * Emitted non-empty arrays are published as output `Take` values. When the
     * channel ends, its final `Exit` is published so subscribers can observe
     * completion or failure.
     *
     * @category destructors
     * @since 4.0.0
     */
    <OutElem, OutErr, OutDone, Env>(self: Channel<Arr.NonEmptyReadonlyArray<OutElem>, OutErr, OutDone, unknown, unknown, unknown, Env>, options: {
        readonly capacity: "unbounded";
        readonly replay?: number | undefined;
    } | {
        readonly capacity: number;
        readonly strategy?: "dropping" | "sliding" | "suspend" | undefined;
        readonly replay?: number | undefined;
    }): Effect.Effect<PubSub.PubSub<Take.Take<OutElem, OutErr, OutDone>>, never, Env | Scope.Scope>;
};
//# sourceMappingURL=Channel.d.ts.map