text: const gulp = require('gulp');
  const eslint = require('gulp-eslint');
  const mocha = require('gulp-mocha');
  const header = require('gulp-header');
  const webpack = require('webpack');
  const webpackStream = require('webpack-stream');
  const scsslint = require('gulp-scss-lint');
  const sass = require('gulp-sass');
  const autoprefixer = require('gulp-autoprefixer');
  const browserSync = require('browser-sync').create();
  const pkg = require('./package.json');
  const webpackConfig = require('./webpack.config');
  const testWebpackConfig = require('./webpack.test.config');
  
  const banner = '/*! <%= pkg.name %> - v<%= pkg.version %> | <%= new Date().getFullYear() %> */\n';
  
  gulp.task('test-script-format', () => (
      gulp.src([
          './examples/src/**.js',
          './src/**/*.js',
          './test/**/*.js',
          './*.js',
      ])
          .pipe(eslint())
          .pipe(eslint.format())
          .pipe(eslint.failOnError())
  ));
  
  gulp.task('test-mocha', ['test-script-format'], () => (
      gulp.src(['./test/**/*.js'])
          .pipe(mocha({
              require: [
                  'babel-register',
                  './test/setup.js',
              ],
          }))
  ));
  
  gulp.task('test', ['test-script-format', 'test-mocha']);
  
  gulp.task('build-script', ['test'], () => (
      gulp.src(['./src/index.js'])
          .pipe(webpackStream(webpackConfig, webpack))
          .pipe(header(banner, { pkg }))
          .pipe(gulp.dest('./lib/'))
  ));
  
  gulp.task('build-style', () => (
      gulp.src('./src/scss/**/*.scss')
          .pipe(scsslint())
          .pipe(scsslint.failReporter())
          .pipe(sass({
              outputStyle: 'expanded',
          }).on('error', sass.logError))
          .pipe(autoprefixer({
              browsers: ['last 2 versions'],
          }))
          .pipe(gulp.dest('./lib'))
  ));
  
  gulp.task('build', ['build-script', 'build-style']);
  
  gulp.task('build-examples-style', () => (
      gulp.src('./examples/src/scss/**/*.scss')
          .pipe(scsslint())
          .pipe(scsslint.failReporter())
          .pipe(sass({
              outputStyle: 'expanded',
          }).on('error', sass.logError))
          .pipe(autoprefixer({
              browsers: ['last 2 versions'],
          }))
          .pipe(gulp.dest('./examples/dist'))
          .pipe(browserSync.stream())
  ));
  
  gulp.task('build-examples-script', () => (
      gulp.src(['./examples/src/index.js'])
          .pipe(webpackStream(testWebpackConfig, webpack))
          .pipe(gulp.dest('./examples/dist/'))
          .pipe(browserSync.stream())
  ));
  
  gulp.task('build-examples-html', () => (
      gulp.src('./examples/src/index.html')
          .pipe(gulp.dest('./examples/dist/'))
          .pipe(browserSync.stream())
  ));
  
  gulp.task('examples', ['build-examples-style', 'build-examples-script', 'build-examples-html'], () => {
      browserSync.init({ server: './examples/dist' });
  
      gulp.watch(['./src/js/**/*.js', './examples/src/**/*.js'], ['build-examples-script']);
      gulp.watch(['./src/scss/**/*.scss', './examples/src/**/*.scss'], ['build-examples-style']);
      gulp.watch(['./examples/src/**/*.html'], ['build-examples-html']).on('change', browserSync.reload);
  });
  
  gulp.task('default', ['build']);
  