const path = require('path')
const htmlWebpackPlugin = require('html-webpack-plugin')
const VueLoaderPlugins = require('./node_modules/vue-loader/lib/plugin')
const webpack = require('webpack')
const {
    options
} = require('less')

module.exports = {
    entry: './src//main.js',
    output: {
        path: path.join(__dirname, './dist/'), // 出口路径必须是个绝对路径
        filename: 'bundle.js', // 打包结果的文件名
    },
    devtool: 'eval-cheap-module-source-map',
    mode: 'development',
    plugins: [
        new htmlWebpackPlugin({
            template: './index.html'
        }),
        new VueLoaderPlugins(),
        new webpack.NamedModulesPlugin(),
        new webpack.HotModuleReplacementPlugin()
    ],
    devServer: {
        historyApiFallback: true,
        contentBase: './',
        hot: true,
        proxy: {
            '/api': { // api表示当前项目请求的key
                target: 'http://localhost:3000', // 代理服务器路径
                pathRewrite: {
                    '^/api': '/'
                }, // 重写路径
                changeOrigin: true
            }
        }
    },
    externals: {
        // 前面是包名，后面是包里导出的全局接口对象
        vue: 'Vue',
        'vue-router': 'VueRouter',
        axios: 'axios',
        lodash: '_'
    },
    module: {
        rules: [
            //css
            {
                test: /\.css$/,
                use: [
                    //这两个顺序不能反了
                    'style-loader',
                    'css-loader'
                ]
            },
            //img
            {
                test: /\.(png|jpg|svg|gif)$/,
                use: {
                    loader: 'file-loader',
                    options: {
                        name: '[path][name].[ext]',
                        esModule: false // 防止出现打包后请求的资源变成 [object-object] 
                    }
                }
            },
            //less
            {
                test: /\.less$/,
                use: [
                    'style-loader',
                    'css-loader',
                    'less-loader'
                ]
            },
            //js(bable)
            {
                test: /\.m?js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            },
            //vue
            {
                test: /\.vue$/,
                use: ['vue-loader']
            }
        ]
    }
}