expect: Export expect as default export

[NaridaL]

This allows types to be exported as well.
Fixes #11487
Strictly speaking a breaking change, as expect = require('expect') not longer works, but as this is usually used as a global, this shouldn't be much of an issue.

Summary

To recap #11487 , the "expect" doesn't export the actual Matchers interface which the expect() function returns, but rather an interface which extends Matchers. This means that you can't extend the returned interface with typescript's declaration merging.

This the cleaner solution, which replaces the export = with export default which allows re-exporting types.

Test plan

Is it possible to test the types? packages/expect/src/__tests__/extend.test.ts has TS errors, but still shows up green.

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[codecov-commenter]

Codecov Report

Merging #11490 (70bb15f) into master (82d1a1a) will decrease coverage by 0.00%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##           master   #11490      +/-   ##
==========================================
- Coverage   68.95%   68.95%   -0.01%     
==========================================
  Files         312      312              
  Lines       16310    16309       -1     
  Branches     4722     4722              
==========================================
- Hits        11247    11246       -1     
  Misses       5035     5035              
  Partials       28       28              

Impacted Files	Coverage Δ
...us/src/legacy-code-todo-rewrite/jestAdapterInit.ts	0.00% <0.00%> (ø)
...-circus/src/legacy-code-todo-rewrite/jestExpect.ts	0.00% <ø> (ø)
packages/jest-globals/src/index.ts	100.00% <ø> (ø)
packages/jest-jasmine2/src/jestExpect.ts	0.00% <ø> (ø)
packages/jest-jasmine2/src/setup_jest_globals.ts	0.00% <0.00%> (ø)
packages/expect/src/index.ts	91.83% <100.00%> (-0.06%)	⬇️

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[SimenB]

As you note, this is a breaking change so we cannot land it until Jest 28.

[NaridaL]

@SimenB OK, apart from that, is this good to be merged as-is?

[mrazauskas]

Similar refactor already landed with #12344

@SimenB Seems like this PR can be closed. (And related issue as well?)

[SimenB]

Good point, thanks! 👍

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