redux-devtools/extension/gulpfile.babel.js

import gulp from 'gulp';
import gutil from 'gulp-util';
import zip from 'gulp-zip';
import webpack from 'webpack';
import devConfig from './webpack/dev.config';
import prodConfig from './webpack/prod.config';
import wrapConfig from './webpack/wrap.config';

/*
 * dev tasks
 */

gulp.task('webpack:dev', (callback) => {
  webpack(devConfig, (err, stats) => {
    if (err) {
      throw new gutil.PluginError('webpack:dev', err);
    }
    gutil.log('[webpack:dev]', stats.toString({ colors: true }));
  });
  callback();
});

/*
 * build tasks
 */

gulp.task('webpack:build:extension', (callback) => {
  function webpackProcess(config) {
    return new Promise((resolve, reject) =>
      webpack(config, (err, stats) => {
        if (err) {
          reject(new gutil.PluginError('webpack:build', err));
        }
        gutil.log('[webpack:build]', stats.toString({ colors: true }));
        resolve();
      })
    );
  }
  webpackProcess(wrapConfig)
    .then(() => webpackProcess(prodConfig))
    .then(callback);
});

/*
 * compress task
 */

gulp.task('compress:extension', (done) => {
  gulp
    .src('build/extension/**')
    .pipe(zip('extension.zip'))
    .pipe(gulp.dest('./build'));
  done();
});

gulp.task('compress:firefox', (done) => {
  gulp
    .src('build/firefox/**')
    .pipe(zip('firefox.zip'))
    .pipe(gulp.dest('./build'));
  done();
});

gulp.task('default', gulp.parallel('webpack:dev'));
gulp.task('build:extension', gulp.parallel('webpack:build:extension'));
gulp.task(
  'copy:build:firefox',
  gulp.series('build:extension', (done) => {
    gulp
      .src([
        './build/extension/**',
        '!./build/extension/redux-devtools-extension.bundle.js',
      ])
      .pipe(gulp.dest('./build/firefox'))
      .on('finish', function () {
        gulp
          .src('./src/browser/firefox/manifest.json')
          .pipe(gulp.dest('./build/firefox'));
      });
    done();
  })
);
gulp.task('build:firefox', gulp.series('copy:build:firefox'));