4.开发

使用 source map

• webpack.config.js

  const path = require('path');
  const HtmlWebpackPlugin = require('html-webpack-plugin');
  const CleanWebpackPlugin = require('clean-webpack-plugin');

  module.exports = {
    entry: {
      app: './src/index.js',
      print: './src/print.js'
    },
+   devtool: 'inline-source-map',
    plugins: [
      new CleanWebpackPlugin(['dist']),
      new HtmlWebpackPlugin({
        title: 'Development'
      })
    ],
    output: {
      filename: '[name].bundle.js',
      path: path.resolve(__dirname, 'dist')
    }
  };

代替手动编译

1. webpack's Watch Mode
2. webpack-dev-server （推荐）
3. webpack-dev-middleware

使用观察模式

使用 webpack-dev-server

• npm install --save-dev webpack-dev-server
• webpack.config.js

  const path = require('path');
  const HtmlWebpackPlugin = require('html-webpack-plugin');
  const {CleanWebpackPlugin} = require('clean-webpack-plugin');

  module.exports = {
    entry: {
      app: './src/index.js',
      print: './src/js/print.js'
    },
    devtool: 'inline-source-map',
	devServer: {
		contentBase: './dist'
	},
    plugins: [
      new CleanWebpackPlugin(),
      new HtmlWebpackPlugin({
        title: 'Development'
      })
    ],
    output: {
      filename: '[name].bundle.js',
      path: path.resolve(__dirname, 'dist')
    }
  };

• package.json

{
  "name": "guide",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
	"start": "webpack-dev-server --open",
    "watch": "webpack --watch",
    "build": "webpack"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "clean-webpack-plugin": "^3.0.0",
    "css-loader": "^3.4.2",
    "csv-loader": "^3.0.2",
    "file-loader": "^5.0.2",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^1.1.3",
    "webpack": "^4.41.6",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.10.3",
    "xml-loader": "^1.2.1"
  },
  "dependencies": {
    "lodash": "^4.17.15"
  }
}

使用 webpack-dev-middleware

调整文本编辑器

某些编辑器具有“安全写入”功能，可能会影响重新编译。

• Sublime Text 3 - 在用户首选项(user preferences)中添加 atomic_save: "false"。
• IntelliJ - 在首选项(preferences)中使用搜索，查找到 "safe write" 并且禁用它。
• Vim - 在设置(settings)中增加 :set backupcopy=yes。
• WebStorm - 在 Preferences > Appearance & Behavior > System Settings 中取消选中 Use "safe write"。