11 lines
414 B
TypeScript
11 lines
414 B
TypeScript
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declare function f<T>(g: (this: T) => void): T
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declare function h(this: number): void;
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f(h)
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// works with infer types as well
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type Check<T> = T extends (this: infer U, ...args: any[]) => any ? string : unknown;
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type r1 = Check<(this: number) => void>; // should be string
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type This<T> = T extends (this: infer U, ...args: any[]) => any ? U : unknown;
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type r2 = This<(this: number) => void>; // should be number
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