chore: do not bundle type definitions for packages which have only one .d.ts file

[mrazauskas]

Summary

What if type definitions of packages which have only one .d.ts file would not be bundled?

First, there is nothing to bundle. Second, that could be an elegant workaround for: https://github.com/facebook/jest/blob/3c6f14bc51a857bb0baf8e6ff7af43aaf47951e9/packages/jest-expect/src/types.ts#L19-L20

In this case the problem was that the bundler is simply discarding declare module 'expect' declaration. An attempt to have jest.Mocked was hitting the same problem, because declare namespace jest was also thrown away. jest.Mocked declaration must live inside @jest/globals, which is just one tiny file. That’s why I though: wait, what is the bundler doing here? ;D

Test plan

Green CI.

[mrazauskas]

Hm.. This part of the script does not run on definition files which are not bundled (should it be split into separate step, perhaps?):

https://github.com/facebook/jest/blob/3c6f14bc51a857bb0baf8e6ff7af43aaf47951e9/scripts/bundleTs.mjs#L160-L195

[SimenB]

thanks! we don't need that snippet you linked in this case since we no longer mess with tsc's output

[github-actions]

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