CSS files imported from the node modules are mysteriously disappearing

Encountered a unique issue while attempting to import a CSS file from a node module.

In the App.tsx file, the following imports were made:

import './App.css';                       // successful
import '@foo/my-dependency/dist/foo.css'; // unsuccessful

Importing a local CSS file works smoothly, but importing foo.css from a node module does not seem to work at all, despite no compilation errors being detected.

Interestingly, changing the import line to use the require syntax resolves the issue.

require('@foo/my-dependency/dist/foo.css'); // successful

Alternatively, utilizing CSS module-like syntax also produces the desired outcome.

import style from '@foo/my-dependency/dist/foo.css'; // successful
console.log(style);     // verifying that the imported content is utilized

To enable the above functionality, it is necessary to include CSS module type declaration as indicated here.

The exact cause of the problem remains unclear. Below is an overview of my Webpack configuration on module rules. Additionally, I am using webpack dev server for testing with Webpack version 5.23.0.

  module: {
    rules: [
      {
        test: /\.(jsx?|tsx?)$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.s?css$/,
        use: [
          'style-loader',
          'css-loader',
          'postcss-loader',
          'sass-loader',
        ],
      }
    ],
  },

Answer №1

Every now and then, I am amazed at how adept I am at tripping over my own feet. This skill can be attributed to a setting of sideEffects: false that I added to the package.json file of a dependency package in order to enable Webpack tree shaking. The importance of marking css/scss files as side effects is emphasized in the documentation found here. By updating it to sideEffects: ["*.css"], everything started functioning properly.

It's not surprising that the other solutions I mentioned are effective as well. When Webpack performs tree shaking, it scans through the import statements starting from the entry file. If an item is not imported or used specifically, tree shaking does not occur.

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