gulpfile.js

var gulp = require('gulp'),
	plugins = require('gulp-load-plugins')(),

	paths = {
		scripts: {
			src: ['./js/src/vendors/*.js', './js/src/components/*.js', './js/src/*.js'],
			dist: './js/dist',
			lint: ['./js/src/components/*.js', './js/src/*.js'],
		},
		sass: {
			src: ['./scss/**/*.scss', '!./scss/amp.scss'],
			dist: './css',
			ampsrc: '.scss/amp.scss'
		},
		css: {
			src: './css/style.css',
			tmp: './tmp',
		},
		images: {
			src: './img/src/**/*.{jpg,jpeg,png,gif,svg,PNG}',
			dist: './img/'
		}
	},

	config = {
		autoprefixer: {
			browsers: ['last 2 versions', '> 5%', 'Firefox ESR']
		},
		images: {
			options: {
		      optimizationLevel: 3,
		      progessive: true,
		      interlaced: true
		    }
		}
	};

function getTask(task) {
    return require('./gulp-tasks/' + task)(config, paths, gulp, plugins);
}

gulp.task('scripts-dev', getTask('scripts-dev'));
gulp.task('scripts-build', getTask('scripts-build'));
gulp.task('scripts-lint', getTask('scripts-lint'));
gulp.task('sass-dev', getTask('sass-dev'));
gulp.task('sass-build', getTask('sass-build'));
gulp.task('amp-css', getTask('amp-css'));
gulp.task('amp-build', getTask('amp-build'));
gulp.task('imgmin', getTask('imgmin'));

gulp.task('amp', ['amp-css', 'amp-build']);

gulp.task('watch', function () {
	gulp.watch(paths.sass.src, ['sass-dev']);
	gulp.watch(paths.scripts.src, ['scripts-dev']);
});

gulp.task('build', ['sass-build', 'scripts-build', 'imgmin', 'amp-css']);