fix(webpack-loader): support json catalogs. Improve coverage

[timofei-iatsenko]

Description

Using json catalogs with webpack loader was broken. Fixed that and added that case to a tests

Details overview:

• When webpack encounter a json file it automatically set a json content type for that module. Despite the fact the loader may return a different type of file. There is no way (except of dirty hacks involving executing private internals of webpack) to tell to webpack that this loader will perform a transformation from json to js. So intstead i just compile catalog in json format and feed it to webpack.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Fixes # (issue)

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[vercel]

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Name	Status	Preview	Comments	Updated
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 17, 2023 at 9:58AM (UTC)

[github-actions]

size-limit report 📦

Path	Size
./packages/core/build/esm/index.js	1.57 KB (0%)
./packages/detect-locale/build/esm/index.js	812 B (0%)
./packages/react/build/esm/index.js	1.67 KB (0%)
./packages/remote-loader/build/esm/index.js	7.25 KB (0%)

[timofei-iatsenko]

Ready. Windows WF failed yesterday because of no binary for the latest node was precompiled. It seems today they fixed it.

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: +0.23 🎉

Comparison is base (4f1d30e) 75.75% compared to head (8658981) 75.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1525      +/-   ##
==========================================
+ Coverage   75.75%   75.98%   +0.23%     
==========================================
  Files          79       79              
  Lines        1980     1970      -10     
  Branches      516      517       +1     
==========================================
- Hits         1500     1497       -3     
+ Misses        360      355       -5     
+ Partials      120      118       -2     

Impacted Files	Coverage Δ
packages/cli/src/api/utils.ts	66.66% <ø> (ø)
packages/loader/test/compiler.ts	66.66% <ø> (ø)
packages/loader/src/webpackLoader.ts	88.88% <75.00%> (+28.88%)	⬆️
packages/cli/src/api/compile.ts	96.29% <100.00%> (+0.29%)	⬆️

... and 1 file with indirect coverage changes

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