gulpfile.js

const gulp = require('gulp');
const gulpLoadPlugins = require('gulp-load-plugins');
const browserSync = require('browser-sync');
const del = require('del');

const $ = gulpLoadPlugins();
const reload = browserSync.reload;

const rename = require('gulp-rename');
const ejs = require("gulp-ejs");

gulp.task('ejs', () => {
  return gulp.src('example/*.ejs')
    .pipe($.plumber())
    .pipe(ejs({}))
    .pipe(rename({extname: '.html'}))
    .pipe(gulp.dest('.tmp/'))
    .pipe(gulp.dest('dist/'))
    .pipe(reload({stream: true}));
});

gulp.task('styles', () => {
  return gulp.src('example/styles/*.css')
    .pipe(gulp.dest('.tmp/styles'))
    .pipe(gulp.dest('dist/styles'))
    .pipe(reload({stream: true}));
});

gulp.task('scripts', () => {
  return gulp.src('example/scripts/**/*.js')
    .pipe($.plumber())
    .pipe(gulp.dest('.tmp/scripts'))
    .pipe(gulp.dest('dist/scripts'))
    .pipe(reload({stream: true}));
});

function lint(files, options) {
  return gulp.src(files)
    .pipe(reload({stream: true, once: true}))
    .pipe($.eslint(options))
    .pipe($.eslint.format())
    .pipe($.if(!browserSync.active, $.eslint.failAfterError()));
}

gulp.task('lint', () => {
  return lint('example/scripts/**/*.js', {
    fix: true
  })
    .pipe(gulp.dest('example/scripts'));
});
gulp.task('lint:test', () => {
  return lint('test/spec/**/*.js', {
    fix: true,
    env: {
      mocha: true
    }
  })
    .pipe(gulp.dest('test/spec/**/*.js'));
});

gulp.task('html', ['styles', 'scripts'], () => {
  return gulp.src('example/*.html')
    .pipe($.useref({searchPath: ['.tmp', 'example', '.']}))
    .pipe(gulp.dest('dist'));
});

gulp.task('images', () => {
  return gulp.src('example/images/**/*')
    .pipe(gulp.dest('.tmp/images'))
    .pipe(gulp.dest('dist/images'));
});

gulp.task('fonts', () => {
  return gulp.src(require('main-bower-files')('**/*.{eot,svg,ttf,woff,woff2}', function (err) {})
    .concat('example/fonts/**/*'))
    .pipe(gulp.dest('.tmp/fonts'))
    .pipe(gulp.dest('dist/fonts'));
});

gulp.task('extras', () => {
  return gulp.src([
    'example/styles/ie/*.*'
  ], {
    dot: true
  }).pipe(gulp.dest('dist/styles/ie/'));
});

gulp.task('clean', del.bind(null, ['.tmp', 'dist/*', '!dist/.*']));

gulp.task('serve', ['ejs', 'styles', 'scripts', 'images', 'fonts'], () => {
  browserSync({
    notify: false,
    port: 9000,
    server: {
      baseDir: ['.tmp', 'example']
    }
  });

  gulp.watch([
    'example/*.html',
    'example/images/**/*',
    '.tmp/fonts/**/*'
  ]).on('change', reload);

  gulp.watch('example/**/*.ejs', ['ejs']);
  gulp.watch('example/styles/**/*.css', ['styles']);
  gulp.watch('example/scripts/**/*.js', ['scripts']);
  gulp.watch('example/fonts/**/*', ['fonts']);
});

gulp.task('serve:dist', () => {
  browserSync({
    notify: false,
    port: 9000,
    server: {
      baseDir: ['dist']
    }
  });
});

gulp.task('serve:test', ['scripts'], () => {
  browserSync({
    notify: false,
    port: 9000,
    ui: false,
    server: {
      baseDir: 'test',
      routes: {
        '/scripts': '.tmp/scripts'
      }
    }
  });

  gulp.watch('example/scripts/**/*.js', ['scripts']);
  gulp.watch('test/spec/**/*.js').on('change', reload);
  gulp.watch('test/spec/**/*.js', ['lint:test']);
});

gulp.task('build', ['lint', 'ejs', 'images', 'fonts', 'styles', 'scripts', 'extras'], () => {
  return gulp.src('dist/**/*').pipe($.size({title: 'build', gzip: true}));
});

gulp.task('default', ['clean'], () => {
  gulp.start('build');
});