vue-chen/vue.config.js

module.exports = {
  devServer: {
    allowedHosts: [],
    disableHostCheck: true,
    port: 8000
  },
  css: {
    loaderOptions: {
      css: {
        sourceMap: process.env.NODE_ENV !== "production"
      }
    }
  },
  publicPath: process.env.NODE_ENV === "production" ? "./" : "/"
};