[Bug]: Expect.Matchers types broke in 27.3.0

[mxschmitt]

Version

27.3.0

Steps to reproduce

1. create a foo.ts
2. put this content in it

import type * as expect from 'expect';

type Foobar = expect.Matchers<{}>;

Expected behavior

no typing issues

Actual behavior

Additional context

It worked before. Seems like a regression introduced in #11949. Before that it was working.

Environment

Not relevant

[mrazauskas]

Inside test-types directory add new file expect.test.ts file (this one is for expect package, because it is not possible to make similar import from globals, right?). Include the copyright lines and this:

import type * as expect from 'expect';

export type M = expect.Matchers<void, unknown>;
export type N = expect.Matchers<void>;
// @ts-expect-error
export type E = expect.Matchers<>;

The export ensures that defined but never used is silenced. expect-error is silencing the expected error. The line with type N will fail before your patch and will pass after.

Might be you found these already, adding just for completeness. Use yarn test-types to run the test. And keep in mind that you have to build the library to see any change in tests.

[mrazauskas]

Oh.. Wrong place. This page was open, because I was copying your code (;

[github-actions]

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