const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const StylelintPlugin = require('stylelint-webpack-plugin');
const RemoveEmptyScriptsPlugin = require('webpack-remove-empty-scripts');
const autoprefixer = require('autoprefixer');
const sass = require('sass');

module.exports = {
  cache: true,
  entry: {
    bundle: `${__dirname}/src/scss/blog.scss`,
  },
  output: {
    path: `${__dirname}/dest/`,
    publicPath: 'auto',
    filename: '[name].js',
    chunkFilename: `[name].chunk.js?date=${new Date().getTime()}`,
    assetModuleFilename: 'assets/[name][ext]',
  },
  optimization: {
    splitChunks: {
      name: 'vendor',
      chunks: 'initial',
    },
  },
  module: {
    rules: [
      {
        test: /\.(scss|css)$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          {
            loader: 'css-loader',
            options: {
              url: true,
              // 0 => no loaders (default);
              // 1 => postcss-loader;
              // 2 => postcss-loader, sass-loader
              importLoaders: 2,
              sourceMap: true,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: [
                  autoprefixer({
                    grid: 'autoplace',
                  }),
                ],
              },
              sourceMap: true,
            },
          },
          {
            loader: 'sass-loader',
            options: {
              implementation: sass,
              sourceMap: true,
              sassOptions: {
                style: 'expanded',
              },
            },
          },
        ],
      },
      {
        test: /\.(jpg|png|svg|woff|woff2|eot|ttf)(\?.*$|$)/,
        type: 'asset',
        parser: {
          dataUrlCondition: {
            maxSize: 4 * 1024, // <--- 4kb
          },
        },
      },
    ],
  },
  plugins: [
    // StyleLint
    new StylelintPlugin({
      configFile: '.stylelintrc',
      context: './src/scss',
      emitError: true,
      emitWarning: true,
      failOnError: true,
      fix: true,
    }),
    // cssの書き出し
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: `[name].chunk.css?date=${new Date().getTime()}`,
    }),
    // 余分なJSを書き出さない
    new RemoveEmptyScriptsPlugin(),
  ],
};
