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Handle type guard predicates on Array<T>.find (#18160)

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* Handle type guard predicates on `Array<T>.find`

If the `predicate` function passed to `Array<T>.find` or `ReadonlyArray<T>.find`
is a type guard narrowing `value` to type `S`, then any returned element should also
be narrowed to `S`.

Adding test case and associated baselines

* trailing whitespace after merge conflict
This commit is contained in:
Joe Calzaretta
2017-10-09 17:58:41 -04:00
committed by Mohamed Hegazy
parent 8b60736b61
commit bb3467b8e1
5 changed files with 115 additions and 0 deletions
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2
src/lib/es2015.core.d.ts vendored
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@@ -10,6 +10,7 @@ interface Array<T> {
* @param thisArg If provided, it will be used as the this value for each invocation of
* predicate. If it is not provided, undefined is used instead.
*/
find<S extends T>(predicate: (this: void, value: T, index: number, obj: T[]) => value is S, thisArg?: any): S | undefined;
find(predicate: (value: T, index: number, obj: T[]) => boolean, thisArg?: any): T | undefined;
/**
@@ -350,6 +351,7 @@ interface ReadonlyArray<T> {
* @param thisArg If provided, it will be used as the this value for each invocation of
* predicate. If it is not provided, undefined is used instead.
*/
find<S extends T>(predicate: (this: void, value: T, index: number, obj: ReadonlyArray<T>) => value is S, thisArg?: any): S | undefined;
find(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): T | undefined;
/**