Help us understand the problem. What is going on with this article?

Webpack4でes6/sassをcompile

More than 1 year has passed since last update.

webpack4でcssをsassにes6をes5にcompileさせる

処理内容

  • es6の記述をbabelでes5に変換
  • polyfillでasync/await対応
  • sassファイルをcssに変換
  • postcssのautoprefixでprefixを作成
  • css、jsファイルをbuildでminify
  • imgファイルを圧縮
  • eslint導入
  • devServerでlocal作業
  • jQueryを一応入れてます

ディレクトリ構成

├── babel.config.js
├── dist
├── package.json
├── src
│   ├── img
│   ├── js
│   └── sass
└── webpack.config.js

バージョン

  • webpack ^4.17.2
  • yarn 1.9.4
  • node 10.5.0

package.json

{
  "name": "hoge",
  "version": "1.0.0",
  "description": "",
  "main": "src/js/app.js",
  "scripts": {
    "start": "webpack-dev-server",
    "dev": "webpack --mode development",
    "build": "webpack --mode production"
  },
  "keywords": [],
  "author": "",
  "license": "UNLICENSED",
  "dependencies": {
    "jquery": "^3.3.1"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
    "@babel/polyfill": "^7.4.4",
    "@babel/preset-env": "^7.0.0",
    "autoprefixer": "^9.1.5",
    "babel-loader": "^8.0.2",
    "copy-webpack-plugin": "^4.6.0",
    "core-js": "^3.0.1",
    "css-loader": "^1.0.0",
    "eslint": "^5.5.0",
    "eslint-config-airbnb": "^17.1.0",
    "eslint-plugin-import": "^2.14.0",
    "eslint-plugin-jsx-a11y": "^6.1.1",
    "eslint-plugin-react": "^7.11.1",
    "file-loader": "^2.0.0",
    "imagemin-webpack-plugin": "^2.3.0",
    "mini-css-extract-plugin": "^0.4.2",
    "node-sass": "^4.9.3",
    "optimize-css-assets-webpack-plugin": "^5.0.1",
    "postcss-loader": "^3.0.0",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.0",
    "uglifyjs-webpack-plugin": "^2.1.1",
    "url-loader": "^1.1.2",
    "webpack": "^4.17.2",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.7"
  },
  "eslintConfig": {
    "extends": "airbnb",
    "env": {
      "browser": true,
      "node": true
    }
  }
}

webpack.config.js

const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const ImageminPlugin = require('imagemin-webpack-plugin').default;
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const AutoPrefixer = require('autoprefixer');

module.exports = [
  {
    entry: {
      app: [
        './src/js/app.js',
        './src/sass/style.scss',
      ],
    },
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: 'js/[name].js',
      publicPath: '/',
    },
    devServer: {
      contentBase: './dist',
      watchContentBase: true,
      port: 3000,
      open: true,
    },
    module: {
      rules: [
        {
          test: /\.js?$/,
          exclude: /node_modules/,
          loader: 'babel-loader',
        },
        {
          test: /\.scss$/,
          use: [{
            loader: MiniCssExtractPlugin.loader,
          }, {
            loader: 'css-loader',
          }, {
            loader: 'postcss-loader',
            options: {
              plugins: [
                AutoPrefixer(
                  {
                    browsers: ['last 2 versions', 'Android >= 4'],
                  },
                ),
              ],
            },
          }, {
            loader: 'sass-loader',
          }],
        },
        {
          test: /\.(jpe?g|png|gif|woff|woff2|eot|ttf|svg)(\?[a-z0-9=.]+)?$/,
          use: [
            {
              loader: 'url-loader?limit=100000&name=img/[name].[ext]',
            },
          ],
        },
      ],
    },
    optimization: {
      minimizer: [
        new OptimizeCSSAssetsPlugin(),
        new UglifyJsPlugin(),
      ],
    },
    resolve: {
      extensions: ['.js'],
    },
    plugins: [
      new CopyWebpackPlugin([
        {
          from: path.resolve(__dirname, 'src/img/'),
          to: path.resolve(__dirname, 'dist/img/'),
        },
      ]),
      new MiniCssExtractPlugin({
        filename: 'css/style.css',
      }),
      new ImageminPlugin({
        test: /\.(jpe?g|png|gif|svg)$/i,
        pngquant: {
          quality: '95-100',
        },
      }),
    ],
  },
];
babel.config.js
module.exports = {
  presets: [
    [
      '@babel/preset-env',
      {
        useBuiltIns: 'usage',
        corejs: '3',
        targets: {
          browsers: ['last 2 versions', '> 3% in JP'],
        },
      },
    ],
  ],
};

ハマったところ

Webpack4のアップデートでbabelもそれに対応させなければならず。どのpackageをinstallしていいのか分からなかったが、こちらのサイトを参考に処理。

webpack 4.x | babel-loader 8.x | babel 7.x
npm install -D babel-loader @babel/core @babel/preset-env webpack

参考サイト

macotok
React好き
access
SDNからセンサ、家電、電子書籍まで。ACCESSはあらゆるレイヤのデバイス、サービスを「繋げて」いきます。
http://jp.access-company.com
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away