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narrowing return type of "array.includes" #37890

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narrowing return type of "array.includes" #37890

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2 changes: 2 additions & 0 deletions lib/lib.es2016.array.include.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ interface Array<T> {
* @param fromIndex The position in this array at which to begin searching for searchElement.
*/
includes(searchElement: T, fromIndex?: number): boolean;
includes(searchElement: T, fromIndex?: number): searchElement is T;
}

interface ReadonlyArray<T> {
Expand All @@ -34,6 +35,7 @@ interface ReadonlyArray<T> {
* @param fromIndex The position in this array at which to begin searching for searchElement.
*/
includes(searchElement: T, fromIndex?: number): boolean;
includes(searchElement: T, fromIndex?: number): searchElement is T;
}

interface Int8Array {
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