[6a3a178] | 1 | /*! *****************************************************************************
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| 2 | Copyright (c) Microsoft Corporation. All rights reserved.
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| 3 | Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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| 4 | this file except in compliance with the License. You may obtain a copy of the
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| 5 | License at http://www.apache.org/licenses/LICENSE-2.0
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| 6 |
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| 7 | THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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| 8 | KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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| 9 | WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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| 10 | MERCHANTABLITY OR NON-INFRINGEMENT.
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| 11 |
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| 12 | See the Apache Version 2.0 License for specific language governing permissions
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| 13 | and limitations under the License.
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| 14 | ***************************************************************************** */
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| 15 |
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| 16 |
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| 17 |
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| 18 | /// <reference no-default-lib="true"/>
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| 19 |
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| 20 |
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| 21 | type FlatArray<Arr, Depth extends number> = {
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| 22 | "done": Arr,
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| 23 | "recur": Arr extends ReadonlyArray<infer InnerArr>
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| 24 | ? 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]>
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| 25 | : Arr
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| 26 | }[Depth extends -1 ? "done" : "recur"];
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| 27 |
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| 28 | interface ReadonlyArray<T> {
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| 29 |
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| 30 | /**
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| 31 | * Calls a defined callback function on each element of an array. Then, flattens the result into
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| 32 | * a new array.
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| 33 | * This is identical to a map followed by flat with depth 1.
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| 34 | *
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| 35 | * @param callback A function that accepts up to three arguments. The flatMap method calls the
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| 36 | * callback function one time for each element in the array.
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| 37 | * @param thisArg An object to which the this keyword can refer in the callback function. If
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| 38 | * thisArg is omitted, undefined is used as the this value.
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| 39 | */
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| 40 | flatMap<U, This = undefined> (
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| 41 | callback: (this: This, value: T, index: number, array: T[]) => U | ReadonlyArray<U>,
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| 42 | thisArg?: This
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| 43 | ): U[]
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| 44 |
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| 45 |
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| 46 | /**
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| 47 | * Returns a new array with all sub-array elements concatenated into it recursively up to the
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| 48 | * specified depth.
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| 49 | *
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| 50 | * @param depth The maximum recursion depth
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| 51 | */
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| 52 | flat<A, D extends number = 1>(
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| 53 | this: A,
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| 54 | depth?: D
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| 55 | ): FlatArray<A, D>[]
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| 56 | }
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| 57 |
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| 58 | interface Array<T> {
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| 59 |
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| 60 | /**
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| 61 | * Calls a defined callback function on each element of an array. Then, flattens the result into
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| 62 | * a new array.
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| 63 | * This is identical to a map followed by flat with depth 1.
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| 64 | *
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| 65 | * @param callback A function that accepts up to three arguments. The flatMap method calls the
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| 66 | * callback function one time for each element in the array.
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| 67 | * @param thisArg An object to which the this keyword can refer in the callback function. If
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| 68 | * thisArg is omitted, undefined is used as the this value.
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| 69 | */
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| 70 | flatMap<U, This = undefined> (
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| 71 | callback: (this: This, value: T, index: number, array: T[]) => U | ReadonlyArray<U>,
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| 72 | thisArg?: This
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| 73 | ): U[]
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| 74 |
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| 75 | /**
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| 76 | * Returns a new array with all sub-array elements concatenated into it recursively up to the
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| 77 | * specified depth.
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| 78 | *
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| 79 | * @param depth The maximum recursion depth
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| 80 | */
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| 81 | flat<A, D extends number = 1>(
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| 82 | this: A,
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| 83 | depth?: D
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| 84 | ): FlatArray<A, D>[]
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| 85 | }
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