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D8H
29 lines
1.2 KiB
TypeScript
29 lines
1.2 KiB
TypeScript
/**
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* Fixes https://github.com/microsoft/TypeScript/issues/16655 for `Array.prototype.filter()`
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* For example, using the fix the type of `bar` is `string[]` in the below snippet as it should be.
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*
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* const foo: (string | null | undefined)[] = [];
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* const bar = foo.filter(Boolean);
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*
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* For related definitions, see https://github.com/microsoft/TypeScript/blob/master/src/lib/es5.d.ts
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*
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* Original licenses apply, see
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* - https://github.com/microsoft/TypeScript/blob/master/LICENSE.txt
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* - https://stackoverflow.com/help/licensing
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*/
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/** See https://stackoverflow.com/a/51390763/1470607 */
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type Falsy = false | 0 | '' | null | undefined;
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interface Array<T> {
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/**
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* Returns the elements of an array that meet the condition specified in a callback function.
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* @param predicate A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the array.
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* @param thisArg An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value.
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*/
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filter<S extends T>(
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predicate: BooleanConstructor,
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thisArg?: any
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): Exclude<S, Falsy>[];
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}
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