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Update filter.ts #5937

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merged 5 commits into from
Jan 26, 2021
Merged

Update filter.ts #5937

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f9a5465
Update filter.ts
leggechr Dec 16, 2020
5c654a7
Update filter-spec.ts
leggechr Dec 16, 2020
87d11aa
test: add test that fails if sig not removed
cartant Dec 17, 2020
dbbf1d6
test: change param type annotation
cartant Dec 17, 2020
2ac4c36
chore: update golden files
benlesh Jan 26, 2021
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4 changes: 0 additions & 4 deletions spec-dtslint/operators/filter-spec.ts
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Expand Up @@ -53,10 +53,6 @@ it('should support Boolean as a predicate', () => {
const x = of(false, false, false, false).pipe(filter(Boolean)); // $ExpectType Observable<true>
});

it('should narrow on always-false predicates', () => {
const o = of(1, 2, 3).pipe(filter(() => false)); // $ExpectType Observable<never>
});

// I've not been able to effect a failing dtslint test for this situation and a
// conventional test won't fail because the TypeScript configuration isn't
// sufficiently strict:
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1 change: 0 additions & 1 deletion src/internal/operators/filter.ts
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Expand Up @@ -3,7 +3,6 @@ import { OperatorFunction, MonoTypeOperatorFunction, TruthyTypesOf } from '../ty
import { operate } from '../util/lift';
import { OperatorSubscriber } from './OperatorSubscriber';

export function filter<T>(predicate: (value: T, index: number) => false, thisArg?: any): OperatorFunction<T, never>;
export function filter<T, S extends T>(predicate: (value: T, index: number) => value is S, thisArg?: any): OperatorFunction<T, S>;
export function filter<T>(predicate: BooleanConstructor): OperatorFunction<T, TruthyTypesOf<T>>;
export function filter<T>(predicate: (value: T, index: number) => boolean, thisArg?: any): MonoTypeOperatorFunction<T>;
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