const path = require('path');

function resolve(dir) {
    return path.join(__dirname, dir);
}

const cdn = {
    js: [
        // vue 必须优先加载(生产环境使用最小运行时版本runtime.min, 其他环境使用全版本)
        process.env.NODE_ENV !== 'production' ?
        'https://cdn.bootcss.com/vue/2.6.10/vue.js' : 'https://cdn.bootcss.com/vue/2.6.9/vue.runtime.min.js',
        // vue-router
        'https://cdn.bootcss.com/vue-router/3.0.6/vue-router.min.js',
        // element js
        'https://unpkg.com/element-ui/lib/index.js'
    ],
    css: [
        // element css
        'https://unpkg.com/element-ui/lib/theme-chalk/index.css'
    ]
};

module.exports = {
    lintOnSave: false,
    publicPath:  process.env.NODE_ENV === 'production' ? './' : '/',
    assetsDir: "public",
    outputDir: 'dist',
    chainWebpack: (config) => {
        // 通过 html-webpack-plugin注入到 index.html
        config.plugin('html').tap(args => {
            args[0].cdn = cdn;
            return args;
        });
    },
    configureWebpack: {
        resolve: {
            alias: {
                '@': resolve('src'),
                'view': resolve('src/view'),
                'assets': resolve('src/assets'),
                'common': resolve('src/common')
            }
        },
        externals: {
            Vue: 'vue',
            'router': 'router',
            'ElementUI': 'element-ui'
        }
    },
    devServer: {
        host: '0.0.0.0',
        port: 8080,
        https: false,
        hotOnly: false,
        proxy: null, // 设置代理
        before: () => {}
    }
};