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Preserve the distributivity of inlined conditional types in declaration emit (#48592)

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This commit is contained in:
Wesley Wigham
2022-04-06 17:21:46 -07:00
committed by GitHub
parent 94d33ba85d
commit 4d2fb5407c
5 changed files with 252 additions and 1 deletions
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18
tests/cases/compiler/declarationEmitInlinedDistributiveConditional.ts Normal file
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// @declaration: true
// @filename: test.ts
import {dropPrivateProps1, dropPrivateProps2} from './api';
const a = dropPrivateProps1({foo: 42, _bar: 'secret'}); // type is {foo: number}
//a._bar // error: _bar does not exist <===== as expected
const b = dropPrivateProps2({foo: 42, _bar: 'secret'}); // type is {foo: number, _bar: string}
//b._bar // no error, type of b._bar is string <===== NOT expected
// @filename: api.ts
import {excludePrivateKeys1, excludePrivateKeys2} from './internal';
export const dropPrivateProps1 = <Obj>(obj: Obj) => excludePrivateKeys1(obj);
export const dropPrivateProps2 = <Obj>(obj: Obj) => excludePrivateKeys2(obj);
// @filename: internal.ts
export declare function excludePrivateKeys1<Obj>(obj: Obj): {[K in PublicKeys1<keyof Obj>]: Obj[K]};
export declare function excludePrivateKeys2<Obj>(obj: Obj): {[K in PublicKeys2<keyof Obj>]: Obj[K]};
export type PublicKeys1<T> = T extends `_${string}` ? never : T;
type PublicKeys2<T> = T extends `_${string}` ? never : T;