.opencode/node_modules/effect/dist/UndefinedOr.js

/**
 * Works with values that may be `undefined`.
 *
 * Use this module for plain TypeScript values of type `A | undefined` when
 * `undefined` is the only absence marker. It is a small alternative to wrapping
 * values in `Option` when your data already uses `undefined` to mean "no
 * value". The module includes helpers for mapping defined values, matching both
 * cases, throwing when a value is missing, adapting throwing functions, and
 * building reducers or combiners.
 *
 * @since 4.0.0
 */
import * as Combiner from "./Combiner.js";
import { dual } from "./Function.js";
import * as Reducer from "./Reducer.js";
/**
 * Maps a defined value with `f`, or returns `undefined` unchanged.
 *
 * **When to use**
 *
 * Use to apply a pure transformation to an `A | undefined` value while
 * preserving `undefined` as absence.
 *
 * @see {@link match} when you need to handle the `undefined` case explicitly
 *
 * @category mapping
 * @since 4.0.0
 */
export const map = /*#__PURE__*/dual(2, (self, f) => self === undefined ? undefined : f(self));
/**
 * Pattern matches on an `A | undefined` value, running `onDefined` when the
 * value is present or evaluating `onUndefined` when the value is `undefined`.
 *
 * **When to use**
 *
 * Use when you need to turn an `A | undefined` into a non-optional result by
 * handling both the defined and undefined branches in one expression.
 *
 * @see {@link map} for transforming defined values while preserving `undefined`
 * @see {@link getOrThrowWith} for throwing when the value is `undefined` instead of returning a fallback branch
 *
 * @category pattern matching
 * @since 4.0.0
 */
export const match = /*#__PURE__*/dual(2, (self, {
  onDefined,
  onUndefined
}) => self === undefined ? onUndefined() : onDefined(self));
/**
 * Returns the defined value, or throws the value produced by `onUndefined`
 * when the input is `undefined`.
 *
 * **When to use**
 *
 * Use when you need fail-fast unwrapping of an `A | undefined` value and want
 * to provide the thrown error for the undefined case.
 *
 * **Details**
 *
 * Defined values are returned unchanged. When the input is `undefined`,
 * `onUndefined` is called and its result is thrown.
 *
 * @see {@link getOrThrow} for the default-error sibling
 * @see {@link match} for handling defined and undefined cases without throwing
 *
 * @category getters
 * @since 4.0.0
 */
export const getOrThrowWith = /*#__PURE__*/dual(2, (self, onUndefined) => {
  if (self !== undefined) {
    return self;
  }
  throw onUndefined();
});
/**
 * Returns the defined value, or throws a default `Error` when the input is
 * `undefined`.
 *
 * **When to use**
 *
 * Use when you need to unwrap a value that should already be defined and a
 * generic missing-value `Error` is acceptable.
 *
 * **Details**
 *
 * Defined inputs are returned unchanged. `undefined` throws
 * `new Error("getOrThrow called on a undefined")`.
 *
 * @see {@link getOrThrowWith} for the sibling that lets callers choose the thrown value
 * @see {@link match} for handling defined and undefined cases without throwing
 *
 * @category getters
 * @since 4.0.0
 */
export const getOrThrow = /*#__PURE__*/getOrThrowWith(() => new Error("getOrThrow called on a undefined"));
/**
 * Converts a throwing function into one that returns successful results
 * unchanged and returns `undefined` when the function throws.
 *
 * **When to use**
 *
 * Use to adapt exception-throwing functions when `undefined` is the absence
 * value you want to return for failures.
 *
 * **Gotchas**
 *
 * Thrown values are discarded. If the wrapped function can successfully return
 * `undefined`, that success is indistinguishable from a thrown failure.
 *
 * @category converting
 * @since 4.0.0
 */
export const liftThrowable = f => (...a) => {
  try {
    return f(...a);
  } catch {
    return undefined;
  }
};
/**
 * Creates a `Reducer` for `UndefinedOr<A>` that prioritizes the first non-`undefined`
 * value and combines values when both operands are present.
 *
 * **When to use**
 *
 * Use when you need to reduce values that may be `undefined`, keeping the
 * first defined value as a fallback and combining only when both operands are
 * defined.
 *
 * **Details**
 *
 * Combining `undefined` with `undefined` returns `undefined`. Combining a
 * defined value with `undefined` keeps the defined value, so the first defined
 * value wins when only one side is present. When both values are defined, they
 * are combined with `combiner.combine`. The reducer's initial value is
 * `undefined`.
 *
 * @category constructors
 * @since 4.0.0
 */
export function makeReducer(combiner) {
  return Reducer.make((self, that) => {
    if (self === undefined) return that;
    if (that === undefined) return self;
    return combiner.combine(self, that);
  }, undefined);
}
/**
 * Creates a `Combiner` for `A | undefined` that combines values only when both
 * operands are defined.
 *
 * **When to use**
 *
 * Use to lift a `Combiner` so any `undefined` operand makes the combined result
 * `undefined`.
 *
 * **Details**
 *
 * - `undefined` combined with any value returns `undefined`
 * - Any value combined with `undefined` returns `undefined`
 * - `a` combined with `b` returns `combiner.combine(a, b)`
 *
 * @see {@link makeReducerFailFast} if you have a `Reducer` and want to lift it
 * to `UndefinedOr` values.
 *
 * @category constructors
 * @since 4.0.0
 */
export function makeCombinerFailFast(combiner) {
  return Combiner.make((self, that) => {
    if (self === undefined || that === undefined) return undefined;
    return combiner.combine(self, that);
  });
}
/**
 * Creates a `Reducer` for `A | undefined` by wrapping an existing reducer with
 * fail-fast semantics.
 *
 * **When to use**
 *
 * Use to wrap an existing `Reducer` so any `undefined` value aborts the entire
 * reduction result.
 *
 * **Details**
 *
 * - Initial value is the wrapped reducer's `initialValue`
 * - Combining two defined values delegates to the wrapped reducer
 * - If the accumulator or next value is `undefined`, the reduction returns `undefined`
 *
 * @see {@link makeCombinerFailFast} if you only have a `Combiner` and want to
 * lift it to `UndefinedOr` values.
 *
 * @category constructors
 * @since 4.0.0
 */
export function makeReducerFailFast(reducer) {
  const combine = makeCombinerFailFast(reducer).combine;
  const initialValue = reducer.initialValue;
  return Reducer.make(combine, initialValue, collection => {
    let out = initialValue;
    for (const value of collection) {
      out = combine(out, value);
      if (out === undefined) return out;
    }
    return out;
  });
}
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