💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

export default (): void /* hi! */ => {};

Configuration file name

babel.config.json

Configuration

{}

Current and expected behavior

Using this test harness:

const babel = require('@babel/core');
const result = babel.transformSync("export default (): void /* hi! */ => {};", {
    filename: './source.ts',
    parserOpts: {
        plugins: ["typescript"],
    },
});
console.log(result.code);

The resulting code produced by Babel looks like this:

export default ((): void
/* hi! */
=> {});

This is invalid TypeScript/JavaScript as the arrow function is not allowed to have a line terminator preceding it.

Removing the comment from the source produces working output:

export default ((): void => {});

Environment

System:
  OS: macOS 11.6.7
Binaries:
  Node: 16.15.1
  Yarn: 1.22.10
  npm: 8.11.0
npmPackages:
  @babel/core: ^7.18.6 => 7.18.6 

Possible solution

No response

Additional context

No response