const path = require('path');
const IS_PROD = ['production', 'prod', 'test'].includes(process.env.NODE_ENV);
const IS_DEV = ['development'].includes(process.env.NODE_ENV);
// gzip
const CompressionWebpackPlugin = require('compression-webpack-plugin');
const productionGzipExtensions = /\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i;
function resolve (dir) {
  return path.join(__dirname, dir);
}

module.exports = {
  devServer: {
    proxy: {
      '/mock': {
        target: 'http://127.0.0.1:4523/mock/611454',
        changeOrigin: true,
        pathRewrite: { '^/mock': '' }
      }
    }
  },
  configureWebpack: config => {
    const plugins = [];
    if (IS_PROD) {
      plugins.push(
        new CompressionWebpackPlugin({
          filename: '[path].gz[query]',
          algorithm: 'gzip',
          test: productionGzipExtensions,
          threshold: 10240,
          minRatio: 0.8
        })
      );
      config.optimization = {
        splitChunks: {
          cacheGroups: {
            common: {
              name: 'chunk-common',
              chunks: 'initial',
              minChunks: 2,
              maxInitialRequests: 5,
              minSize: 0,
              priority: 1,
              reuseExistingChunk: true,
              enforce: true
            },
            vendors: {
              name: 'chunk-vendors',
              test: /[\\/]node_modules[\\/]/,
              chunks: 'initial',
              priority: 2,
              reuseExistingChunk: true,
              enforce: true
            },
            elementUI: {
              name: 'chunk-element-plus',
              test: /[\\/]node_modules[\\/]element-plus[\\/]/,
              chunks: 'all',
              priority: 3,
              reuseExistingChunk: true,
              enforce: true
            },
            echarts: {
              name: 'chunk-echarts',
              test: /[\\/]node_modules[\\/](vue-)?echarts[\\/]/,
              chunks: 'all',
              priority: 4,
              reuseExistingChunk: true,
              enforce: true
            }
          }
        }
      };
    }
  },
  chainWebpack (config) {
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end();
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end();
  }
};