Compiler Config 2

// -----------------------------
// READING WEBPACK CONFIGURATION
// -----------------------------
function webpackCompiler() {
  return new Promise((resolve, reject) => {
    const compiler = webpack(webpackConfig);

    compiler.run((err, stats) => {
      if (err) {
        debug('Webpack compiler encountered a fatal error.', err);

        return reject(err);
      }

      const jsonStats = stats.toJson();

      debug('Webpack compilation is completed.');

      resolve(jsonStats);
    });
  });
}