[Bug]: Babel TypeScript syntax throws with error recovery enabled where offical does not

[msteen]

💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

parse("foo.", { errorRecovery: true })

Configuration file name

No response

Configuration

No response

Current and expected behavior

Currently getting SyntaxError.

Expected the parser to allow empty identifiers in error recovery mode, like TypeScript's parser does:
https://ts-ast-viewer.com/#code/GYexDog

Similar to the other syntax errors as listed in the release notes about error recovery:
https://babeljs.io/blog/2019/11/05/7.7.0#parser-error-recovery-10363

This is crucial to get auto completion to work as expected.

Environment

• System:
  • OS: Linux 6.5 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish)
• Binaries:
  • Node: 20.8.1 - ~/.nvm/versions/node/v20.8.1/bin/node
  • npm: 10.1.0 - ~/.nvm/versions/node/v20.8.1/bin/npm
  • pnpm: 8.12.1 - ~/.nvm/versions/node/v20.8.1/bin/pnpm
  • bun: 1.0.21 - ~/.nvm/versions/node/v20.8.1/bin/bun
• npmPackages:
  • @babel/core: ^7.23.3 => 7.23.3
  • @babel/parser: ^7.24.1 => 7.24.1
  • @babel/plugin-proposal-async-do-expressions: ^7.23.3 => 7.23.3
  • @babel/plugin-proposal-do-expressions: ^7.23.3 => 7.23.3
  • @babel/plugin-proposal-throw-expressions: ^7.23.3 => 7.23.3
  • @babel/plugin-syntax-typescript: ^7.23.3 => 7.23.3
  • @babel/preset-env: ^7.23.6 => 7.23.6
  • @babel/preset-react: ^7.23.3 => 7.23.3
  • @babel/preset-typescript: ^7.23.3 => 7.23.3
  • babel-plugin-module-resolver: ^5.0.0 => 5.0.0

Possible solution

No response

Additional context

I have a dialect of TypeScript that compiles to TypeScript to get language features supported like types and auto completion and I use Babel to do this compilation. So even if TypeScript can deal with foo. just fine, if Babel does not, my language features fail too work.

[babel-bot]

Hey @msteen! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

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