Remove IE 11 from ES6 modules transpilation targets

[lacolaco]

Issue: #16820

What I did

Remove ie 11 from es6Transpiler targets.

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

To fix weird behavior described at #16820 , I've tested many approaches in my local environment (technically modifying codes in node_modules). I've not yet created useful repro to validate this solution.

Clearly, this bug is caused when babel-loader tries to parse prettier/standalone.js in es6Transpiler processing. And prettier/standalone.js is truly valid JS file. So, the problem is the incompatibility between prettier/standalone.js and the babel config written in es6Transpiler.

I've tested some patterns of targets in @babel/preset-env options. Currently es6Transpiler uses defaults targets. If I remove only ie 11, errors went away. So I conclude targeting ie 11 is not compatible with prettier/standalone.js.

cc/ @shilman

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[kylegach]

Hi, @lacolaco. Thank you for your contribution! We would not be able to merge this until v7.0, as changing compilation targets is breaking change. In the interim, have you tried the --modern flag, added in v6.3?

[lacolaco]

@kylegach Yes, but no changes by --modern.

I guess the reason is prettier doesn't provide ESM modules by modern entrypoint. https://unpkg.com/browse/prettier@2.5.1/package.json

[stale]

Hi everyone! Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. Unfortunately, we don't have time to get to every issue. We are always open to contributions so please send us a pull request if you would like to help. Inactive issues will be closed after 30 days. Thanks!

[ndelangen]

@yannbf I think you helped in fixing this, is this correct? Mind checking and if so close this PR? @lacolaco thank you for the assist regardless! ❤️

[yannbf]

Hey @lacolaco thanks a lot for this PR! Seems like #17239 has fixed this issue already. Can you confirm by trying out the latest Storybook release?

[lacolaco]

I've confirmed the current release works. Thanks!