Troublesome CSS conflicts arise when using minified assets with AngularJS and Webpack

After transitioning my Angular project to the Webpack build system, I encountered issues with Angular Dependency Injection in the JS source code. Surprisingly, now I am facing JS errors that are targeting CSS files, leaving me completely bewildered about why this is happening.

The error message reads as follows:

Uncaught Error: [$injector:unpr] Unknown provider: eProvider <- e

This error appears on every CSS file starting with /*!. Furthermore, similar errors are popping up with different CSS styles, like the one shown here:

https://i.sstatic.net/i1BoG.png

Can someone provide guidance on why these JS injector errors are manifesting in CSS files?

The configuration for CSS files in my webpack is as follows;

  {
    test: /\.css$/,
    loader: ExtractTextPlugin.extract({
      use: [
        { loader: 'css-loader',
          options: {
            modules: false,
            sourceMap: true}
        }}
      ],
      fallback: 'style-loader'
    })
  },

I am requiring all CSS files together in an entry file using the following method;

function requireAll(requireContext) {
  return requireContext.keys().map(requireContext);
}

requireAll(require.context('./../assets/css/', true, /\.css$/));

Could someone kindly highlight what might be wrong with the above configuration?

Update:

I managed to resolve the initial error related to comments in the files by adding

minimize: { discardComments: { removeAll: true }
into the options of css-loader. However, the second issue with styles still persists.

Answer №1

After some thorough searching, I discovered that when minifying AngularJS code using webpack, it is necessary to include a specific plugin to address dependency injection issues.

npm install --save-dev babel-plugin-angularjs-annotate

Subsequently, by integrating this plugin into the babel plugins configuration;

{
    test: /\.js$/,
    exclude: /(node_modules|bower_components|assets)/,
    use: {
      loader: 'babel-loader?name=js/[hash].[ext]',
      options: {
        presets: ['env'],
        plugins: ['transform-runtime', 'angularjs-annotate']
      }
    }
  }

This resolves the aforementioned problem.

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