Version 3.1.0+ breaks SASS modules composition

[igor10k]

Describe the bug

In 3.1.0 the resolve-url-loader lib was added that breaks SASS modules composition. Either removing the lib from the webpack config or downgrading to 3.0.1 fixes the issue.

Did you try recovering your dependencies?

Yes. Deleted node-modules and removed the package-lock.json.

Environment

Environment Info:

  System:
    OS: macOS 10.14.6
    CPU: (8) x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
  Binaries:
    Node: 12.6.0 - /usr/local/bin/node
    Yarn: 1.17.3 - /usr/local/bin/yarn
    npm: 6.10.1 - /usr/local/bin/npm
  Browsers:
    Chrome: 77.0.3865.75
    Firefox: 66.0.3
    Safari: 12.1.2
  npmPackages:
    react: ^16.9.0 => 16.9.0 
    react-dom: ^16.9.0 => 16.9.0 
    react-scripts: 3.1.1 => 3.1.1 
  npmGlobalPackages:
    create-react-app: Not Found

Steps to reproduce

1. npx create-react-app test_app && cd test_app
2. yarn add node-sass
3. Create b.module.sass with

.test
  background: #FFF

4. Create a.module.sass with

.test
  composes: test from './b.module.sass`

5. In App.js add as the first line import './a.module.sass'
6. yarn start and observe the error

---

7. Rename b.module.sass to b.module.css and replace the contents with

.test {
  background: #FFF;
}

8. In a.module.sass change b.module.sass to b.module.css
9. Observe that the error is gone

Expected behavior

Build succeeds.

Actual behavior

Build fails.

./src/b.module.sass (./node_modules/css-loader/dist/cjs.js??ref--6-oneOf-6-1!./node_modules/postcss-loader/src??postcss!./node_modules/resolve-url-loader??ref--6-oneOf-6-3!./src/b.module.sass)
Error: resolve-url-loader: CSS error
  ./src/b.module.sass:2:3: Unknown word
You tried to parse Sass with the standard CSS parser; try again with the postcss-sass parser
  You tried to parse Sass with the standard CSS parser; try again with the postcss-sass parser

Reproducible demo

https://github.com/Igor10k/rca_sass_modules_bug

[igor10k]

Created a related issue in the resolve-url-loader repo as well bholloway/resolve-url-loader#131

[bholloway]

It seems this is a css-loader issue per webpack-contrib/css-loader#131.

They have closed that issue but I suspect that it is not fixed. I suggest anyone who arrives here may need to agitate on that issue to get this fixed.

[crux153]

I'm using react-app-rewired to temporarily fix this issue.
Below is content of my config-overrides.js to remove resolve-url-loader from webpack config.

const findSassModuleRule = (config) => {
  let sassModuleRuleIndex;
  const cssLoaderModule = config.module.rules.find(ruleItem => {
    if (!ruleItem.oneOf || !ruleItem.oneOf.length) {
      return false;
    }
    sassModuleRuleIndex = ruleItem.oneOf.findIndex(
      loaderItem =>
        loaderItem.test &&
        loaderItem.test.toString() === "/\\.module\\.(scss|sass)$/"
    );
    return sassModuleRuleIndex !== -1;
  });

  const sassModuleRule = cssLoaderModule.oneOf[sassModuleRuleIndex];
  return sassModuleRule;
};

// Remove resolve-url-loader which causes SASS modules to not work properly
// TODO: Remove this when below issue gets fixed
// https://github.com/facebook/create-react-app/issues/7682
const removeResolveUrlLoader = (config) => {
  const sassModuleRule = findSassModuleRule(config);
  sassModuleRule.use = sassModuleRule.use.filter(
    loaderItem =>
      !(loaderItem.loader && loaderItem.loader.includes("/resolve-url-loader/"))
  );
  return config;
};

module.exports = function override(config) {
  config = removeResolveUrlLoader(config);
  return config;
}

Hope this helps before this issue gets fixed.

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

[stale]

This issue has been automatically closed because it has not had any recent activity. If you have a question or comment, please open a new issue.

[sublimedatasys]

Is there any workaround? I am having the same issue. See #8144 for more detail

[lorini]

Hi,

Same issue here, in 3.0.1 everything is going well. But as soon as I bump version to 3.1.0, I get the same error as @igor10k. (3.2.0 doesn't work either)

@crux153 workaround is working well for developement, but the build fails to compile with error :

Creating an optimized production build...
Failed to compile.

Lexical error on line 1: Unrecognized text.
  Erroneous area:
1: #{$element} - #{$substract}
^..^

Hope it helps.

Thanks for you work on react.