SOURCE

optimization: {
			concatenateModules: true,
			minimize: true,
			minimizer: [
				new TerserPlugin({
					parallel: true,
					extractComments: true,
					terserOptions: {
						compress: {
							drop_console: true,
							drop_debugger: false,
							pure_funcs: ['console.log'],
							drop_debugger: true,
						},
						format: {
							comments: false,
						},
					},
				}),
			],
			splitChunks: {
				cacheGroups: {
					//vendors,node_modules中除了vue，element等以外第三方。例如http-server，热加载等。正式环境打包如果再没有第三依赖，则不会产生。
					vendors: {
						name: 'chunk-vendors',
						test: /[\\/]node_modules[\\/]/,
						minChunks: 1,
						priority: 1, //权重
						chunks: 'initial',
					},
					corejs: {
						name: 'corejs',
						test: /[\\/]node_modules[\\/]core-js[\\/]/,
						chunks: 'initial',
						priority: 4,
						reuseExistingChunk: true,
						enforce: true,
					},
					animatecss: {
						name: 'animatecss',
						test: /[\\/]node_modules[\\/]animate.css[\\/]/,
						chunks: 'all',
						priority: 4,
						reuseExistingChunk: true,
						enforce: true,
					},
					vue: {
						name: 'vue',
						test: /[\\/]node_modules[\\/]vue[\\/]/,
						chunks: 'all',
						priority: 3,
						reuseExistingChunk: true,
						enforce: true,
					},
					'element-ui': {
						name: 'element-ui',
						test: /[\\/]node_modules[\\/]element-ui[\\/]/,
						chunks: 'all',
						priority: 3,
						reuseExistingChunk: true,
						enforce: true,
					},
					/**
					 * 权重必须高于父权重，且必须文件夹
					 */
					'element-utils': {
						name: 'element-utils',
						test: /[\\/]node_modules[\\/]element-ui[\\/]lib[\\/]utils[\\/]/,
						chunks: 'all',
						priority: 4,
						reuseExistingChunk: true,
						enforce: true,
					},
					'element-ui-theme': {
						name: 'element-ui-theme',
						test: /[\\/]node_modules[\\/]element-ui[\\/]lib[\\/]theme-chalk[\\/]/,
						chunks: 'initial',
						priority: 4,
						reuseExistingChunk: true,
						enforce: true,
					},
					vuex: {
						name: 'vuex',
						test: /[\\/]node_modules[\\/]vuex[\\/]/,
						chunks: 'all',
						priority: 3,
						reuseExistingChunk: true,
						enforce: true,
					},
					'vue-router': {
						name: 'vue-router',
						test: /[\\/]node_modules[\\/]vue-router[\\/]/,
						chunks: 'all',
						priority: 3,
						reuseExistingChunk: true,
						enforce: true,
					},
					axios: {
						name: 'axios',
						test: /[\\/]node_modules[\\/]axios[\\/]/,
						chunks: 'all',
						priority: 3,
						reuseExistingChunk: true,
						enforce: true,
					},
				},
			},
		},