Add ESLint 8 support to @babel/eslint-parser

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #13712
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?	Yes
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

The parser can check the ESLint version using require("eslint/package.json") (since it's a peer dependency). However, we need an escape hatch to switch version on-the-fly during our tests.

I don't think we need any change to @babel/eslint-plugin: we could potentially make some rules no-op, but they are already effectively no-op with ESLint 8.

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[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/49490/

[fedeci]

Does this close #13060?

[JLHwung]

We can avoid hard-coded tokens index by a class wrapper

function getFirstToken(source) {
  return parseForESLint(`class A { ${source} }`).ast.tokens[3];
}

expect(getFirstToken("static m() {}").toMatchObject(staticKw)
// ...

[nicolo-ribaudo]

I'd prefer to do that in a separate PR, since we would need to update the whole file.

[nicolo-ribaudo]

I don't think we need docs for this, since we don't mention anywhere that we support ESLint 7.

[nicolo-ribaudo]

I cannot reproduce the failures locally, and I'm confused because Node.js 17 (latest) fails but Node.js 16 doesn't 🤔

CI errors related

[JLHwung]

I think we should also add dynamicESLintVersionCheck = true; fore "test", the CI begins failing when I remove the plugin for test: JLHwung@f13dad3

[nicolo-ribaudo]

Thanks!