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* Applies a function to the value at the given index of an array
*
* @param index
* @param fn
* @param collection
* @returns Copy of the array with the element at the given index replaced with the result of the function application.
*/
declare const adjust: <T>(index: number, fn: (value: T) => T, collection: T[]) => T[];
type Fn$1 = (arg: any, ...args: any[]) => Promise<any> | any;
type ComposedInput$1<T extends Fn$1[]> = T extends [
...any,
(arg: infer A, ...args: any[]) => Promise<any> | any
] ? A : never;
type ComposedOutput$1<T extends Fn$1[]> = T extends [
(arg: any, ...args: any[]) => Promise<infer R> | infer R,
...any
] ? R : never;
/**
* Performs right-to-left function composition with async functions support.
* asyncCompose(f, g, h)(x) is equivalent to f(g(h(x))), awaiting each result.
*
* @param fns - Functions to compose (can be sync or async)
* @returns Composed async function that applies functions from right to left
*/
declare const asyncCompose: <T extends Fn$1[]>(...fns: T) => (value: ComposedInput$1<T>, ...args: Parameters<T[0]> extends [any, ...infer Rest] ? Rest : []) => Promise<ComposedOutput$1<T>>;
/**
* Capitalize first letter of each word
*
* @param value - Any string
* @returns Capitalized string
*/
declare const capitalize: (value?: string | null) => string | null | undefined;
/**
* Casts value to array
*
* @template T - The type of the value.
* @param value - The value to cast into an array.
* @returns The value as-is if already an array, otherwise wrapped in an array.
*/
declare const castArray: <T>(value: T | T[]) => T[];
type Fn = (arg: any, ...args: any[]) => any;
type ComposedInput<T extends Fn[]> = T extends [
...any,
(arg: infer A, ...args: any[]) => any
] ? A : never;
type ComposedOutput<T extends Fn[]> = T extends [
(arg: any, ...args: any[]) => infer R,
...any
] ? R : never;
/**
* Performs right-to-left function composition.
* compose(f, g, h)(x) is equivalent to f(g(h(x)))
*
* @param fns - Functions to compose
* @returns Composed function that applies functions from right to left
*/
declare const compose: <T extends Fn[]>(...fns: T) => (value: ComposedInput<T>, ...args: any[]) => ComposedOutput<T>;
/**
* Drops the last element from an array or string.
*
* @param value - The array or string to drop the last element from
* @returns A new array or string with the last element removed
*/
declare function dropLast(value: string): string;
declare function dropLast<T>(value: T[]): T[];
/**
* Applies a set of transformations to an object and returns a new object with the transformed values.
*
* @example
* evolve({ count: (n) => n + 1 }, { name: 'item', count: 5 })
* // => { name: 'item', count: 6 }
*
* @param transformations - The transformations to apply
* @param object - The object to transform
* @returns The transformed object
*/
declare function evolve<T extends Record<string, any>>(transformations: Partial<{
[K in keyof T]: (value: T[K]) => T[K];
}>, object: T): T;
/**
* Retrieves the value at a given path from an object.
*
* @example
* get({ a: { b: 1 } }, ['a', 'b'], 0) // => 1
* get({ a: { b: 1 } }, ['a', 'c'], 0) // => 0
*
* @param target - The object to retrieve the value from
* @param path - The path of the value to retrieve
* @param defaultValue - The default value to return if the path does not exist
* @returns The value at the given path, or the default value if the path does not exist
*/
declare const get: (target: any, path: (string | number)[] | string | number, defaultValue: any) => any;
/**
* Checks if a value is null or undefined.
*
* @example
* isNil(null) // => true
* isNil(undefined) // => true
* isNil(0) // => false
*
* @param value - The value to check
* @returns True if the value is null or undefined, false otherwise
*/
declare const isNil: (value: unknown) => value is null | undefined;
/**
* Returns the last element of an array or last character of a string.
*
* @example
* last([1, 2, 3]) // => 3
* last('abc') // => 'c'
* last([]) // => undefined
* last('') // => ''
*
* @param value - The array or string
* @returns The last element/character, or undefined for empty arrays
*/
declare function last(value: string): string;
declare function last<T>(value: T[]): T | undefined;
type IteratorFn = (value: any, key: string, index: number) => any;
/**
* Maps over the values of an object and applies a function to each value.
*
* @example
* mapValues({ a: 1, b: 2 }, (v) => v * 2) // => { a: 2, b: 4 }
*
* @param object - The object to map over
* @param fn - The function to apply to each value
* @returns A new object with the mapped values
*/
declare const mapValues: (object: Record<string, any>, fn: IteratorFn) => Record<string, any>;
interface PercentMatch {
percent: number;
value: number;
}
/**
* Parses a percentage string and returns both the numeric value and decimal percent.
*
* @example
* matchPercent('50%') // => { value: 50, percent: 0.5 }
* matchPercent('-25%') // => { value: -25, percent: -0.25 }
* matchPercent('abc') // => null
*
* @param value - The value to parse
* @returns Object with value and percent, or null if not a valid percentage
*/
declare const matchPercent: (value: string | number | null) => PercentMatch | null;
/**
* Creates a new object by omitting specified keys from the original object.
*
* @example
* omit('b', { a: 1, b: 2, c: 3 }) // => { a: 1, c: 3 }
* omit(['a', 'c'], { a: 1, b: 2, c: 3 }) // => { b: 2 }
*
* @param keys - The key or keys to omit
* @param object - The original object
* @returns The new object without the omitted keys
*/
declare const omit: (keys: string | string[], object: Record<string, any>) => Record<string, any>;
/**
* Picks the specified keys from an object and returns a new object with only those keys.
*
* @example
* pick(['a', 'c'], { a: 1, b: 2, c: 3 }) // => { a: 1, c: 3 }
* pick(['x'], { a: 1, b: 2 }) // => {}
*
* @param keys - The keys to pick from the object
* @param object - The object to pick the keys from
* @returns A new object with only the picked keys
*/
declare const pick: (keys: (string | number)[], object: Record<string, any>) => Record<string, any>;
/**
* Repeats an element a specified number of times.
*
* @example
* repeat('a', 3) // => ['a', 'a', 'a']
* repeat(0, 4) // => [0, 0, 0, 0]
* repeat('x') // => []
*
* @param element - Element to be repeated
* @param length - Number of times to repeat element (default: 0)
* @returns Array with the element repeated
*/
declare const repeat: <T>(element: T, length?: number) => T[];
/**
* Returns a new array with elements in reverse order. Does not mutate the original.
*
* @example
* reverse([1, 2, 3]) // => [3, 2, 1]
* reverse(['a', 'b']) // => ['b', 'a']
*
* @param array - Array to be reversed
* @returns New array with elements reversed
*/
declare const reverse: <T>(array: T[]) => T[];
/**
* Converts the first character of a string to uppercase. Does not affect other characters.
*
* @example
* upperFirst('hello') // => 'Hello'
* upperFirst('hELLO') // => 'HELLO'
* upperFirst('') // => ''
* upperFirst(null) // => null
*
* @param value - The string to transform
* @returns String with first character uppercased, or the original value if null/undefined/empty
*/
declare const upperFirst: <T extends string | null | undefined>(value: T) => T extends string ? string : T;
/**
* Returns a new array excluding the specified values.
*
* @example
* without([2, 4], [1, 2, 3, 4, 5]) // => [1, 3, 5]
* without(['b'], ['a', 'b', 'c']) // => ['a', 'c']
*
* @param exclude - Values to exclude from the array
* @param array - Array to filter
* @returns A new array without the excluded values
*/
declare const without: <T>(exclude: T[], array: T[]) => T[];
/**
* Parse a string or number to a float. Non-string values pass through unchanged.
*
* @example
* parseFloat('3.14') // => 3.14
* parseFloat(42) // => 42
* parseFloat('10px') // => 10
* parseFloat(null) // => null
*
* @param value - The value to parse
* @returns Parsed float for strings, original value otherwise
*/
declare const parseFloat: <T extends string | number | null | undefined>(value: T) => T extends string ? number : T;
export { adjust, asyncCompose, capitalize, castArray, compose, dropLast, evolve, get, isNil, last, mapValues, matchPercent, omit, parseFloat, pick, repeat, reverse, upperFirst, without };
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