[babel 8] Report a SyntaxError for } and > in JSX text

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #11042
Backport	#11046
Patch: Bug Fix?	Yes
Major: Breaking Change?	Yes
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

This PR is moving #11046 from babel-8-dev to main. The only change is that I made the error recoverable (just by deleting throw in front of this.raise).

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/34166/

[nicolo-ribaudo]

make prepublish-build generates this code:

        case 62:
        case 125:

        default:

while BABEL_8_BREAKING=true make prepublish-build generates this: (with the first commit of #12447 that fixes the boolean logic in the build process)

        case 62:
        case 125:
          {
            const htmlEntity = ch === 125 ? "}" : ">";
            const char = this.input[this.state.pos];
            this.raise(this.state.pos, `Unexpected token \`${char}\`. Did you mean \`${htmlEntity}\` or \`{'${char}'}\`?`);
          }

        default:

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[TrySound]

Does this mean users can optionally enable new syntax?

[nicolo-ribaudo]

No, at the moment we strip away the flag at build time.
Our priority now is to move things from the next-8-dev branch to main, then we'll decide if we prefer to release a beta version or to leave the flag in the released distribution.