24 lines
1.1 KiB
TypeScript
24 lines
1.1 KiB
TypeScript
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// @strict: true
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type TakeString = (s: string) => any;
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// Various functions accepting an object whose properties are TakeString functions.
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// Note these all use mapped types.
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declare function mapped1<T extends {[P in string]: TakeString}>(obj: T): void;
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declare function mapped2<T extends {[P in keyof T]: TakeString}>(obj: T): void;
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declare function mapped3<T extends {[P in keyof any]: TakeString}>(obj: T): void;
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declare function mapped4<T>(obj: T & {[P in keyof T]: TakeString}): void;
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declare function mapped5<T, K extends keyof T>(obj: T & {[P in K]: TakeString}): void;
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declare function mapped6<K extends string>(obj: {[P in K]: TakeString}): void;
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declare function mapped7<K extends keyof any>(obj: {[P in K]: TakeString}): void;
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declare function mapped8<K extends 'foo'>(obj: {[P in K]: TakeString}): void;
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declare function mapped9<K extends 'foo'|'bar'>(obj: {[P in K]: TakeString}): void;
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mapped1({foo: s => 42});
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mapped2({foo: s => 42});
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mapped3({foo: s => 42});
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mapped4({foo: s => 42});
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mapped5({foo: s => 42});
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mapped6({foo: s => 42});
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mapped7({foo: s => 42});
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mapped8({foo: s => 42});
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mapped9({foo: s => 42});
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