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chore: extend and improve type tests for jest object #12442

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merged 9 commits into from Feb 21, 2022
Merged

chore: extend and improve type tests for jest object #12442

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b16cfc6
add type tests for jest object
mrazauskas Feb 20, 2022
e89c64b
fix test
mrazauskas Feb 20, 2022
19e56a6
tweak constrain
mrazauskas Feb 20, 2022
fe798c6
add changelog entry
mrazauskas Feb 21, 2022
8c25aab
clean up
mrazauskas Feb 21, 2022
d98face
clean up
mrazauskas Feb 21, 2022
f342cce
real clean up
mrazauskas Feb 21, 2022
93971bf
more tests
mrazauskas Feb 21, 2022
92b21a8
tweak overload type
mrazauskas Feb 21, 2022
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2 changes: 1 addition & 1 deletion packages/jest-mock/src/index.ts
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Expand Up @@ -995,7 +995,7 @@ export class ModuleMocker {
isMockFunction<T, Y extends Array<unknown> = Array<unknown>>(
fn: (...args: Y) => T,
): fn is Mock<T, Y>;
isMockFunction(fn: unknown): boolean;
isMockFunction(fn: unknown): fn is Mock<unknown>;
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@SimenB Might be this is better idea. See tests. Thanks for good questions!

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perfect, thanks!

isMockFunction<T>(fn: unknown): fn is Mock<T> {
return !!fn && (fn as any)._isMockFunction === true;
}
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30 changes: 15 additions & 15 deletions packages/jest-types/__typetests__/jest.test.ts
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Expand Up @@ -150,34 +150,34 @@ if (!jest.isMockFunction(surelyMock)) {
expectType<never>(surelyMock);
}

declare const stringNotMock: string;
declare const stringMaybeMock: string;

if (!jest.isMockFunction(stringNotMock)) {
expectType<string>(stringNotMock);
if (!jest.isMockFunction(stringMaybeMock)) {
expectType<string>(stringMaybeMock);
}

if (jest.isMockFunction(stringNotMock)) {
expectType<string>(stringNotMock);
if (jest.isMockFunction(stringMaybeMock)) {
expectType<string & Mock<unknown, Array<unknown>>>(stringMaybeMock);
}

declare const anyNotMock: any;
declare const anyMaybeMock: any;

if (!jest.isMockFunction(anyNotMock)) {
expectType<any>(anyNotMock);
if (!jest.isMockFunction(anyMaybeMock)) {
expectType<any>(anyMaybeMock);
}

if (jest.isMockFunction(anyNotMock)) {
expectType<any>(anyNotMock);
if (jest.isMockFunction(anyMaybeMock)) {
expectType<Mock<unknown, Array<unknown>>>(anyMaybeMock);
}

declare const unknownNotMock: unknown;
declare const unknownMaybeMock: unknown;

if (!jest.isMockFunction(unknownNotMock)) {
expectType<unknown>(unknownNotMock);
if (!jest.isMockFunction(unknownMaybeMock)) {
expectType<unknown>(unknownMaybeMock);
}

if (jest.isMockFunction(unknownNotMock)) {
expectType<unknown>(unknownNotMock);
if (jest.isMockFunction(unknownMaybeMock)) {
expectType<Mock<unknown, Array<unknown>>>(unknownMaybeMock);
}

expectType<Mock<unknown>>(jest.fn());
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