webpack.config.js

const path = require('path')
const { CKEditorTranslationsPlugin } = require('@ckeditor/ckeditor5-dev-translations')
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const { styles } = require('@ckeditor/ckeditor5-dev-utils')

module.exports = {
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.vue$/,
        use: 'vue-loader'
      },
      {
        test: /\.svg$/i,
        use: ['raw-loader']
      },
      {
        test: /ckeditor5-[^/\\]+[/\\]theme[/\\].+\.css$/,

        use: [
          {
            loader: 'style-loader',
            options: {
              injectType: 'singletonStyleTag',
              attributes: {
                'data-cke': true
              }
            }
          },
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              postcssOptions: styles.getPostCssConfig({
                themeImporter: {
                  themePath: require.resolve('@ckeditor/ckeditor5-theme-lark')
                },
                minify: true
              })
            }
          }
        ]
      }
    ]
  },
  entry: './src/index.js',
  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, 'dist')
  },
  resolve: {
    alias: {
      vue$: 'vue/dist/vue.esm.js'
    }
  },
  plugins: [
    new VueLoaderPlugin()
  ]
}