fix(webpack): allow files with .cjs extension to be transpiled

[rchl]

Fixes #10339

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Not sure if you consider it a bug fix or a feature but it seems like a bug to me.

Resolves #10339

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #10340 (dfe9a74) into dev (e5efc25) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev   #10340   +/-   ##
=======================================
  Coverage   65.19%   65.19%           
=======================================
  Files          94       94           
  Lines        4155     4155           
  Branches     1172     1172           
=======================================
  Hits         2709     2709           
  Misses       1167     1167           
  Partials      279      279           

Flag	Coverage Δ
unittests	65.19% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/webpack/src/config/base.js	65.89% <ø> (ø)

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[rchl]

There is also this line that maybe should be updated also:

https://github.com/nuxt/nuxt.js/blob/4f87ed0ca1d57edd9b6882ce824f799f31128255/packages/webpack/src/config/base.js#L242-L242

@clarkdo

[danielroe]

@rchl Agreed. Would you update that one as well?

[rchl]

I will but note that the fix works without this change so I'm not sure what's the exact purpose of this.

[rchl]

Any plans to merge and release a new Nuxt 2 version?

[pi0]

Thanks for working on this pull request @rchl and sorry it took long to merge. CI was failing because of dependencies. And indeed we plan to make at least two minor versions for Nuxt 2 and including this fix as well.