babel-parser(ts): Unfriendly error for duplicates access modifier

[sosukesuzuki]

Bug Report

• I would like to work on a fix!

Current behavior

Syntax error Unexpected token is thrown.

• REPL
  Input Code

class Foo {
   private public foo;
}

Expected behavior

Syntax recoverable error Accessibility modifier already seen. is thrown. Like TS. Also only the first access modifier should be included in AST.

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)

• Filename: babel.config.js

Environment

Possible Solution

Additional context