const path = require("path");
const resolve = dir => path.join(__dirname, dir);
module.exports = {
  chainWebpack: config => {
        /* svg的配置 */
        const svgRule = config.module.rule("svg");
        svgRule.uses.clear();
        svgRule.exclude.add(/node_modules/);
        svgRule
            .test(/\.svg$/)
            .use("svg-sprite-loader")
            .loader("svg-sprite-loader")
            .options({
                symbolId: "icon-[name]"
            });
        const imagesRule = config.module.rule("images");
        imagesRule.exclude.add(resolve("src/icons"));
        config.module.rule("images").test(/\.(png|jpe?g|gif|svg)(\?.*)?$/);
    // 添加别名
    config.resolve.alias
      .set("vue$", "vue/dist/vue.esm.js")
      .set("@", resolve("src"))
      .set("@assets", resolve("src/assets"))
  }
};
 /* 生产环境图片进行压缩 */    
if (process.env.NODE_ENV=='production') {
    config.module
        .rule("images")
        .use("image-webpack-loader")
        .loader("image-webpack-loader")
        .options({
            mozjpeg: { progressive: true, quality: 65 },
            optipng: { enabled: false },
            pngquant: { quality: [0.65, 0.9], speed: 4 },
            gifsicle: { interlaced: false }
            // webp: { quality: 75 }
        });
}