npm install --save-dev webpack-merge
开发环境(development)和生产环境(production)的构建目标差异很大。在开发环境中，我们需要具有强大的、具有实时重新加载(live reloading)或热模块替换(hot module replacement)能力的 source map 和 localhost server。而在生产环境中，我们的目标则转向于关注更小的 bundle，更轻量的 source map，以及更优化的资源，以改善加载时间。由于要遵循逻辑分离，我们通常建议为每个环境编写彼此独立的 webpack 配置。
webpack.common.js
const path = require('path');
// const CleanWebpackPlugin = require('clean-webpack-plugin');
const {CleanWebpackPlugin} = require('clean-webpack-plugin');//加{}否则会报错
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: {
app: './src/index.js'
},
plugins: [
new CleanWebpackPlugin(), //(['dist'])官网里面加这个会报错了去掉了
new HtmlWebpackPlugin({
title: 'Production'
})
],
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist')
}
};
/** 知识补充
* https://www.cnblogs.com/cench/p/5800157.html
*
*/
webpack.dev.js
const merge = require('webpack-merge');
const common = require('./webpack.common.js');
module.exports = merge(common, {
devtool: 'inline-source-map',
devServer: {
contentBase: './dist'
}
});
/** 知识补充
* webpack——devtool里的7种SourceMap模式
* https://www.cnblogs.com/wangyingblog/p/7027540.html
*
*/
webpack.prod.js
const webpack = require('webpack');
const merge = require('webpack-merge');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const common = require('./webpack.common.js');
module.exports = merge(common, {
plugins: [
new UglifyJSPlugin({
sourceMap: true
}),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify('production')
})
]
});
//
NPM Scripts配置
"start": "webpack-dev-server --open --config webpack.dev.js",
"server": "node server.js",
"build": "webpack --config webpack.prod.js"