Enable test variance-annotations-with-jsx with babel8

[liuxingbaoyu]

Q	A
Fixed Issues?	Fixes #1, Fixes #2
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/52099/

[liuxingbaoyu]

I'm having a weird problem here.
In parser tests, this file has a lot of redefinition errors.
But in the generator test, there is only one > error when parsing.

[nicolo-ribaudo]

The generator test ignores all the recoverable errors when errorRecovery is enabled! I'm merging this, since it only touches tests.

[liuxingbaoyu]

  "errors": [
    "SyntaxError: Unexpected token `>`. Did you mean `>` or `{'>'}`? (2:10)",
    "SyntaxError: 'public' modifier cannot appear on a type parameter. (98:9)",
    "SyntaxError: Duplicate modifier: 'in'. (99:16)",
    "SyntaxError: 'in' modifier must precede 'out' modifier. (99:16)",

Strangely, when I debug, only the first error is included in the parsing result.

[nicolo-ribaudo]

Let me try cloning this PR locally 🤔

[nicolo-ribaudo]

Is it in the Babel 7 or Babel 8 test?

[liuxingbaoyu]

Thanks!

These bugs such as redefinition errors should exist in both babel 7 and 8.
https://github.com/babel/babel/blob/edd8d01bf26143ad648b61dda183f7986b8c5383/packages/babel-parser/test/fixtures/typescript/types/variance-annotations-with-jsx-babel-7/output.json
But errorRecovery is not needed in babel 7's generator tests.
Also only contains > symbol errors in babel 8's generator tests.
it's weird...

[nicolo-ribaudo]

Uh well, you see different errors because the generator test and the parser tests have different inputs! The parser tests is londer and contain many invalid statements, so we test that we can still parse them.

For the generator we only care about printing them, and we only test valid inputs because invalid inputs are not 100% represented in the AST. For example, in in T has the same AST as in T so we only test the second one.

[liuxingbaoyu]

Oh, thanks! I see, sorry for not noticing.