35 lines
1.3 KiB
Plaintext
35 lines
1.3 KiB
Plaintext
tests/cases/compiler/promisesWithConstraints.ts(15,1): error TS2322: Type 'Promise<Foo>' is not assignable to type 'Promise<Bar>'.
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Property 'y' is missing in type 'Foo' but required in type 'Bar'.
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tests/cases/compiler/promisesWithConstraints.ts(20,1): error TS2322: Type 'CPromise<Foo>' is not assignable to type 'CPromise<Bar>'.
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Type 'Foo' is not assignable to type 'Bar'.
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==== tests/cases/compiler/promisesWithConstraints.ts (2 errors) ====
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interface Promise<T> {
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then<U>(cb: (x: T) => Promise<U>): Promise<U>;
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}
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interface CPromise<T extends { x: any; }> {
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then<U extends { x: any; }>(cb: (x: T) => Promise<U>): Promise<U>;
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}
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interface Foo { x; }
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interface Bar { x; y; }
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var a: Promise<Foo>;
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var b: Promise<Bar>;
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a = b; // ok
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b = a; // ok
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~
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!!! error TS2322: Type 'Promise<Foo>' is not assignable to type 'Promise<Bar>'.
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!!! error TS2322: Property 'y' is missing in type 'Foo' but required in type 'Bar'.
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!!! related TS2728 tests/cases/compiler/promisesWithConstraints.ts:10:20: 'y' is declared here.
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var a2: CPromise<Foo>;
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var b2: CPromise<Bar>;
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a2 = b2; // ok
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b2 = a2; // was error
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~~
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!!! error TS2322: Type 'CPromise<Foo>' is not assignable to type 'CPromise<Bar>'.
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!!! error TS2322: Type 'Foo' is not assignable to type 'Bar'.
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