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Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0
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See the Apache Version 2.0 License for specific language governing permissions
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***************************************************************************** */
/// <reference no-default-lib="true"/>
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>[];
}
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