feat(jest-config): Support using esbuild-register for loading TS configs
Summary
PR adds support for using esbuild-register as a support loader for the jest.config.ts file. The user can opt into using it by using a docblock (@jest-config-loader) and suggested as part of #13143.
This PR would supercede the work done in #12041.
The motivation for the PR is that I do not use ts-node in my projects, rather I use esbuild (through tsx) and that esbuild-register allows for me to reuse existing modules I've installed for my project, rather than installing ts-node just to read the jest.config.ts file.
The eventual goal would be to add some additional modules (e.g. tsx), but that'll require a bit of upstream work first to support how jest enables and then disables the module after it's done parsing the jest.config.ts file.
Test plan
I've added a new e2e test that should pass:
$ yarn jest e2e/__tests__/readInitialOptions.test.ts
PASS e2e/__tests__/readInitialOptions.test.ts
readInitialOptions
✓ should read from the cwd by default (67 ms)
✓ should read a jest.config.js file (60 ms)
✓ should read a package.json file (63 ms)
✓ should read a jest.config.ts file with ts-node (543 ms)
✓ should read a jest.config.ts file with esbuild-register (150 ms)
✓ should read a jest.config.mjs file (61 ms)
✓ should read a jest.config.json file (67 ms)
✓ should read a jest config exporting an async function (64 ms)
✓ should be able to skip config reading, instead read from cwd (66 ms)
✓ should give an error when there are multiple config files (59 ms)
✓ should be able to ignore multiple config files error (64 ms)
Test Suites: 1 passed, 1 total
Tests: 11 passed, 11 total
Snapshots: 0 total
Time: 1.542 s
Ran all test suites matching /e2e\/__tests__\/readInitialOptions.test.ts/i.
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@MasterOdin ping 🙂
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