const isProduction = process.env.NODE_ENV === 'production';
const cdn = {
	css: [
		'https://cdn.jsdelivr.net/npm/vant@2.2/lib/index.css',
	    'https://cdn.jsdelivr.net/npm/v-charts/lib/style.min.css',
	],
	js: [
		'https://cdn.bootcss.com/vue/2.5.17/vue.runtime.min.js',
		'https://cdn.bootcss.com/vue-router/3.0.1/vue-router.min.js',
		'https://cdn.bootcss.com/vuex/3.0.1/vuex.min.js',
		'https://cdn.bootcss.com/axios/0.18.0/axios.min.js',
		'https://cdn.jsdelivr.net/npm/echarts/dist/echarts.min.js',
		'https://cdn.jsdelivr.net/npm/v-charts/lib/index.min.js',
	]
}

module.exports = {
	devServer: {
		open: true
	},
	lintOnSave: process.env.NODE_ENV !== 'production',
	productionSourceMap: false,
	chainWebpack: config => {
		// 生产环境配置
		if (isProduction) {
			// 生产环境注入cdn
			config.plugin('html')
				.tap(args => {
					args[0].cdn = cdn;
					return args;
				});
		}
	},
	configureWebpack: config => {
		if (isProduction) {
			// 用cdn方式引入
			config.externals = {
				'vue': 'Vue',
				'vuex': 'Vuex',
				'vue-router': 'VueRouter',
				'axios': 'axios',
				'vant': 'vant',
				'echarts': 'echarts'
			}
		}
	},
}