// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')

module.exports = {
  mode: 'development', // production development
  // development devtool cheap-module-eval-source-map
  // production devtool cheap-module-source-map
  devtool: 'cheap-module-eval-source-map',
  entry: {
    sendlog: './src/index.js',
  },
  output: {
    // publicPath: "https://j.weizan.cn",
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist'),
  },
  devServer: {
    contentBase: './dist',
    open: true,
    hot: true,
    hotOnly: true,
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: {
          // 业务代码（存在全局污染）
          presets: [
            [
              '@babel/preset-env',
              {
                targets: {
                  chrome: '67',
                },
                useBuiltIns: 'usage',
              },
            ],
          ],
          // 库代码（类似于闭包形式）
          plugins: [
            [
              '@babel/plugin-transform-runtime',
              {
                corejs: 2,
                helpers: true,
                regenerator: true,
                useESModules: false,
              },
            ],
          ],
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new CleanWebpackPlugin(),
    new webpack.HotModuleReplacementPlugin(),
  ],
}

{
  "name": "log",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "directories": {
    "lib": "lib"
  },
  "scripts": {
    "serve": "webpack-dev-server",
    "build": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.10.3",
    "@babel/plugin-transform-runtime": "^7.10.3",
    "@babel/preset-env": "^7.10.3",
    "babel-loader": "^8.1.0",
    "clean-webpack-plugin": "^3.0.0",
    "html-webpack-plugin": "^4.3.0",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12",
    "webpack-dev-server": "^3.11.0"
  },
  "dependencies": {
    "@babel/polyfill": "^7.10.1",
    "@babel/runtime": "^7.10.3",
    "@babel/runtime-corejs2": "^7.10.3",
    "axios": "^0.19.2",
    "protobufjs": "^6.9.0"
  }
}

import '@babel/polyfill'