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feat: Have Inverse exportable in types.ts#15704

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cpojer merged 2 commits into
jestjs:mainfrom
dprevost-LMI:have-Inverse-exportable
Jun 27, 2025
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feat: Have Inverse exportable in types.ts#15704
cpojer merged 2 commits into
jestjs:mainfrom
dprevost-LMI:have-Inverse-exportable

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@dprevost-LMI dprevost-LMI commented Jun 26, 2025 •
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Summary

The expect-webdriverio is based on the expect library, and it would be helpful if the Inverse<Matchers> could be exportable here

When implementing our Expect interface, we have a new method like soft where we want to reuse Inverse as shown below:

// Copied while we would like to export it!
type Inverse<M> = {
    /**
     * Inverse next matcher. If you know how to test something, `.not` lets you test its opposite.
     */
    not: M;
}

declare namespace ExpectWebdriverIO {
    Inverse<R, T> = ExpectWebdriverIO.Matchers<R, T> & Inverse<ExpectWebdriverIO.Matchers<R, T>>

    interface Expect extends ExpectLibExpect {

        <T = unknown>(actual: T): MatchersAndInverse<void, T>;
        soft<T = unknown>(actual: T): T extends PromiseLikeType ? MatchersAndInverse<Promise<void>, T> : MatchersAndInverse<void, T>
    }

Test plan

Used in jest-expect and yarn build passed!

@dprevost-LMI
Have Inverse exportable in types.ts
499cecb 
Have this one exportable to reuse instead of copying it
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commit: 1148076

@mrazauskas
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mrazauskas commented Jun 26, 2025

You should also export it from the index.ts file.

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mrazauskas commented Jun 26, 2025

And perhaps you could import and reuse the same Inverse here:

jest/packages/jest-expect/src/types.ts

Lines 27 to 32 in 77cc947

type Inverse<Matchers> = {
/**
* Inverse next matcher. If you know how to test something, `.not` lets you test its opposite.
*/
not: Matchers;
};

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mrazauskas commented Jun 26, 2025

Looks good to me. You should turn off the draft mode, so that the maintainers could take a look and merge.

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dprevost-LMI commented Jun 26, 2025

Looks good to me. You should turn off the draft mode, so that the maintainers could take a look and merge.

Will do, wanted to double-check pipeline failure before in case I blew something, but sounds related to something else!

@dprevost-LMI dprevost-LMI marked this pull request as ready for review June 26, 2025 14:35
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mrazauskas commented Jun 26, 2025

related to something else

Indeed, the errors in CI should be fixed by #15701.

cpojer
cpojer approved these changes Jun 27, 2025
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Cool! Thanks.

@cpojer cpojer merged commit c88d1f1 into jestjs:main Jun 27, 2025
58 of 76 checks passed
@dprevost-LMI dprevost-LMI mentioned this pull request Jun 28, 2025
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