[wp-trac] [WordPress Trac] #46110: IE11: JS "Syntax error" related to wp-polyfill-formdata

[WordPress Trac]

#46110: IE11: JS "Syntax error" related to wp-polyfill-formdata
--------------------------+-----------------------------
 Reporter:  afercia       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.0
 Severity:  normal        |   Keywords:  has-screenshots
  Focuses:  javascript    |
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 In Internet Explorer 11, there's a JavaScript "Syntax error" related to
 `wp-polyfill-formdata`. The error happens in various pages, e.g. in
 `edit.php` and `post.php`.

 [[Image(http://cldup.com/-UPS1EV0FC.png)]]

 IE11 doesn't support "arrow functions" and other ES6 features in that
 file. Asked for feedback on Slack #core-editor and it was pointed out that
 seems core is using the wrong file from the package.

 Wrong version used in core:

 https://github.com/WordPress/wordpress-
 develop/blob/e01f30a/tools/webpack/packages.js#L104

 Correct version used in the Gutenberg plugin:

 https://github.com/WordPress/gutenberg/blob/2d7035b/lib/client-
 assets.php#L619

 Introduced in [43719] /Cc @omarreiss @atimmer

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Ticket URL: <https://core.trac.wordpress.org/ticket/46110>
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