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es2019.array.d.ts
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65 lines (58 loc) · 2.33 KB
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type FlatArray<Arr, Depth extends number> = {
"done": Arr,
"recur": Arr extends ReadonlyArray<infer InnerArr>
? FlatArray<InnerArr, [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20][Depth]>
: Arr
}[Depth extends -1 ? "done" : "recur"];
interface ReadonlyArray<T> {
/**
* Calls a defined callback function on each element of an array. Then, flattens the result into
* a new array.
* This is identical to a map followed by flat with depth 1.
*
* @param callback A function that accepts up to three arguments. The flatMap method calls the
* callback function one time for each element in the array.
* @param thisArg An object to which the this keyword can refer in the callback function. If
* thisArg is omitted, undefined is used as the this value.
*/
flatMap<U, This = undefined> (
callback: (this: This, value: T, index: number, array: T[]) => U | ReadonlyArray<U>,
thisArg?: This
): U[]
/**
* Returns a new array with all sub-array elements concatenated into it recursively up to the
* specified depth.
*
* @param depth The maximum recursion depth
*/
flat<A, D extends number = 1>(
this: A,
depth?: D
): FlatArray<A, D>[]
}
interface Array<T> {
/**
* Calls a defined callback function on each element of an array. Then, flattens the result into
* a new array.
* This is identical to a map followed by flat with depth 1.
*
* @param callback A function that accepts up to three arguments. The flatMap method calls the
* callback function one time for each element in the array.
* @param thisArg An object to which the this keyword can refer in the callback function. If
* thisArg is omitted, undefined is used as the this value.
*/
flatMap<U, This = undefined> (
callback: (this: This, value: T, index: number, array: T[]) => U | ReadonlyArray<U>,
thisArg?: This
): U[]
/**
* Returns a new array with all sub-array elements concatenated into it recursively up to the
* specified depth.
*
* @param depth The maximum recursion depth
*/
flat<A, D extends number = 1>(
this: A,
depth?: D
): FlatArray<A, D>[]
}