Fix multiline re-export of the default export

[kylekthompson]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

Fixes the highlighting when re-exporting a default export:

export {
  default as alias,
} from 'module';

Alternate Designs

Find an alternate regex.

Benefits

The export will be properly tokenized.

Possible Drawbacks

There could be a performance hit with the new regex.

Applicable Issues

I actually did find one! #271

[kylekthompson]

@50Wliu sorry it's taken me so long to get back to this!

So, I've tracked down the issue with this; the problem is that the multiline re-export is falling into the from-less matches here.

My proposed change is to search for from across multiple lines, though I'm running into some issues with xregexp. Are we not able to use the s flag?

[MaximSokolov]

My proposed change is to search for from across multiple lines

This is not possible due to limitation of the regex engine. It can be fixed by removing this pattern and changing invalid.illegal -> variable.language.default here, so default always would be legal inside export statement

[kylekthompson]

@MaximSokolov I had considered doing that, but it breaks this case:

export { default as alias };

Maybe it's okay that we don't highlight this as invalid?

[MaximSokolov]

Yeah, it's fine. Linting is not a priority for this package

[kylekthompson]

✨ updated the fix. Thanks for the quick feedback on this!