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Fix: not import @swc/helpers in script tag without type="module" #7599

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merged 3 commits into from Jan 26, 2022
Merged

Fix: not import @swc/helpers in script tag without type="module" #7599

merged 3 commits into from Jan 26, 2022

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Shinyaigeek
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@Shinyaigeek Shinyaigeek commented Jan 23, 2022 •
edited

↪️ Pull Request

Fixes: #7597

Hi team! 👋

I investigated about #7597 bug. I found that this issue is caused by the behavior of swc replacing new(?) JavaScript syntax with the module imported from @swc/helpers while swc parses the source code. This inserted import declaration causes this error.

I fixed this by changing the behavior of importing polyfill into inserting itself.

💻 Examples

<html>
<script>
  function hoge() {
    return [1,2,3]
}

const [one, two] = hoge();
</script>
</html>

This script will be transpiled. see https://play.swc.rs/?version=1.2.133&code=H4sIAAAAAAAAA0srzUsuyczPU8jIT0%2FV0FSo5lIAgqLUktKiPIVoQx0jHeNYrlouruT8vOIShej8vFQdhZLy%2FFgFW6gOawBY3PGGQgAAAA%3D%3D&config=H4sIAAAAAAAAA01POw7CMAy9i2c2JIaegIVDWKlbBeUn20GtqtwdJ1TA9uz3sw94ioPpgIIsxB3JnhQ3mED3QuLYF4ULqNhqwSDUbEBeSU1CcjUu5Cx0shegTYkThjuFQiwwKVdbR5%2F8svcCl2NhEvk6IqY10F88Y5Ilc%2BxqJnQ6QE3qo8kAq%2BaI6p11z%2FSikEukpJ%2Bm1iwh5rn2xGM8MQ69QfsdcRZ7eZzC4XwDSiW6fQ0BAAA%3D

🚨 Test instructions

I've written a test to make sure it doesn't give an error and doesn't import swc helper in a bundled HTML with targeting Chrome 48, which doesn't support Array Destructuring.

✔️ PR Todo

  • Added/updated unit tests for this change
  • Filled out test instructions (In case there aren't any unit tests)
  • Included links to related issues/PRs

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@Shinyaigeek Shinyaigeek changed the title Fix/import swc helper errors on script Fix: not import @swc/helpers in script tag without type="module" Jan 23, 2022
@Shinyaigeek Shinyaigeek force-pushed the fix/import-swc-helper-errors-on-script branch from f040669 to ae49891 Compare January 23, 2022 10:56
@Shinyaigeek Shinyaigeek marked this pull request as draft January 23, 2022 10:59
@Shinyaigeek Shinyaigeek force-pushed the fix/import-swc-helper-errors-on-script branch from ae49891 to e9bd92a Compare January 23, 2022 10:59
@Shinyaigeek Shinyaigeek marked this pull request as ready for review January 23, 2022 11:20
@Shinyaigeek Shinyaigeek mentioned this pull request Jan 23, 2022
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devongovett
devongovett approved these changes Jan 26, 2022
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This seems like a reasonable fix. Thanks!

@devongovett devongovett merged commit a930ba5 into parcel-bundler:v2 Jan 26, 2022
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@devongovett devongovett devongovett approved these changes

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Successfully merging this pull request may close these issues.

Parcel Incorrectly Detects Destructuring Assignment As Module Usage
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@Shinyaigeek @devongovett