build.js

const webpack = require("webpack");
const webpackConfig = require("./webpack.config");
const ora = require('ora')
const chalk = require('chalk')

const spinner = ora("building for production...");
spinner.start();
webpack(webpackConfig, (err, stats) => {
  spinner.stop();
  if (err) throw err;
  process.stdout.write(
    stats.toString({
      colors: true,
      modules: false,
      children: true,
      chunks: false,
      chunkModules: false
    }) + "\n\n"
  );

  if (stats.hasErrors()) {
    console.log(chalk.red("  Build failed with errors.\n"));
    process.exit(1);
  }

  console.log(chalk.cyan("  Build complete.\n"));
  console.log(
    chalk.yellow(
      "  Tip: built files are meant to be served over an HTTP server.\n" +
        "  Opening index.html over file:// won't work.\n"
    )
  );
});