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June 27, 2024 00:41
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attempt at a MockedService utility type
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| /* eslint-disable @typescript-eslint/no-unused-vars */ | |
| /* eslint-disable @typescript-eslint/no-explicit-any */ | |
| type IfAny<T, Y, N> = 0 extends 1 & T ? Y : N; | |
| type IsAny<T, Y, N> = IfAny<T, Y, N>; | |
| type TypeWithGeneric<T> = T[]; | |
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
| // type extractGeneric<Type> = | |
| // Type extends jest.MaybeMockedDeep<infer X, any[], any> ? X : never; | |
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
| type JestMockAny = jest.Mock<any, any, any>; | |
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
| type JestMockString = jest.Mock<string, number[], null>; | |
| type IsJestMockAny<T extends jest.MockableFunction> = IsAny< | |
| ReturnType<T>, | |
| never, | |
| jest.MaybeMockedDeep<T> | |
| >; | |
| const fn = jest.fn<string, number[], any>(); | |
| const result = fn(1, 2, 3); | |
| type A = IsJestMockAny<JestMockAny>; | |
| type B = IsJestMockAny<JestMockString>; | |
| const b: B = (a, b) => {}; | |
| export type MockedService< | |
| T extends Record<string | symbol | number, jest.MockableFunction> | |
| > = { | |
| // https://stackoverflow.com/questions/78674994/is-there-way-to-say-but-doesnt-match-any-in-typescript/78675024#78675024 | |
| [K in keyof T]: IsJestMockAny<T[K]>; | |
| } & T; | |
| type Foo = { | |
| getA: (a: string, b: string) => Promise<{ c: string }>; | |
| getB: (e: number, f: number) => Promise<{ g: string }>; | |
| }; | |
| const mockedFoo: MockedService<Foo> = { | |
| getA: jest.fn().mockRejectedValue(new Error('not implemented')), | |
| // nb. The mock return values are not stricted enforced, if you | |
| // don't wrap with jest.mocked! | |
| getB: jest.fn() | |
| }; | |
| function createMockedService< | |
| T extends Record<string | symbol | number, jest.MockableFunction>, | |
| V extends MockedService<T> | |
| >(value: V) { | |
| return value; | |
| } | |
| createMockedService<Foo>({ | |
| getA: jest.fn().mockRejectedValue(new Error('not implemented')), | |
| // nb. The mock return values are not stricted enforced, if you | |
| // don't wrap with jest.mocked! | |
| getB: jest.fn() | |
| }); | |
| mockedFoo.getB(1, 2); |
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