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fix(bug): fixes issue where babel helpers would force ESM variants ev…
…en though they were marked as external. Fixes #15
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,70 @@ | ||
// tslint:disable:array-type | ||
|
||
export declare type Flat<A> = A extends Array<infer B> | ||
? B extends Array<infer C> | ||
? C extends Array<infer D> | ||
? D extends Array<infer E> | ||
? E extends Array<infer F> | ||
? F extends Array<infer G> | ||
? G extends Array<infer H> | ||
? H extends Array<infer I> | ||
? I extends Array<infer J> | ||
? J extends Array<infer K> | ||
? K extends Array<infer L> | ||
? L extends Array<infer M> | ||
? M extends Array<infer N> | ||
? M | ||
: L | ||
: K | ||
: J | ||
: I | ||
: H | ||
: G | ||
: F | ||
: E | ||
: D | ||
: C | ||
: B | ||
: A | ||
: A; | ||
|
||
// tslint:disable:no-any | ||
|
||
/** | ||
* Flattens the array with the given recursive depth | ||
* @param {T[]} arr | ||
* @returns {T[]} | ||
*/ | ||
export function flat<T>(arr: T): Flat<T> { | ||
const target: any[] = []; | ||
if (!Array.isArray(arr)) return <Flat<T>>arr; | ||
|
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flattenIntoArray(target, arr, Infinity); | ||
return <Flat<T>>(<any>target); | ||
} | ||
|
||
/** | ||
* Flattens the given source array into a new array | ||
* @param {T[]} target | ||
* @param {T[]} source | ||
* @param {number} [depth=1] | ||
* @param {number} [start=0] | ||
* @returns {number} | ||
*/ | ||
function flattenIntoArray<T>(target: T[], source: T[], depth: number = 1, start: number = 0): number { | ||
let targetIndex = start; | ||
let sourceIndex = 0; | ||
const sourceLength = source.length; | ||
while (sourceIndex < sourceLength) { | ||
const element = source[sourceIndex]; | ||
|
||
if (depth > 0 && Array.isArray(element)) { | ||
targetIndex = flattenIntoArray(target, element, depth - 1, targetIndex); | ||
} else { | ||
target[targetIndex] = element; | ||
targetIndex++; | ||
} | ||
sourceIndex++; | ||
} | ||
return targetIndex; | ||
} |
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