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devxoul/Spy.ts

Created February 12, 2021 12:24
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Jest Spy type
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Spy.ts
type Spy<T extends {}, M extends jest.FunctionPropertyNames<Required<T>>> = Required<T>[M] extends (...args: any[]) => any
? jest.SpyInstance<ReturnType<Required<T>[M]>, jest.ArgsType<Required<T>[M]>>
: never;
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