21 lines
413 B
TypeScript
21 lines
413 B
TypeScript
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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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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