gulpfile.js

'use strict';

var gulp = require('gulp'),
    watch =  require('gulp-watch'),
    rigger = require('gulp-rigger'),
    sourcemaps = require('gulp-sourcemaps'),
    uglify = require('gulp-uglify'),
    sass = require('gulp-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    gcmq = require('gulp-group-css-media-queries'),
    cleanCSS = require('gulp-clean-css'),
    imagemin = require('gulp-imagemin'),
    imageminPngquant = require('imagemin-pngquant'),
    imageminJpegRecompress = require('imagemin-jpeg-recompress'),
    rename = require("gulp-rename");

var path = {
    src: {
        style: 'css/src/style.scss',
        js: 'js/src/scripts.js',
        img: 'images_prebuild/**/*.*',
        img_import: 'import_prebuild/**/*.*'
    },
    build: {
        js: 'js/',
        style: 'css/',
        img: 'images/',
        img_import: 'import/'
    },
    watch: {
        style: 'css/src/**/*.scss',
        js: 'js/src/**/*.js',
    }
};

gulp.task('style:build', function () {
    gulp.src(path.src.style)
        .pipe(sourcemaps.init())
        .pipe(sass())
        .pipe(autoprefixer())
        .pipe(gcmq())
        .pipe(cleanCSS())
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest(path.build.style));
});

gulp.task('js:build', function () {
    gulp.src(path.src.js) //Найдем наш main файл
        .pipe(rigger()) //Прогоним через rigger
        .pipe(gulp.dest(path.build.js)) //Выплюнем готовый файл в build
        .pipe(sourcemaps.init()) //Инициализируем sourcemap
        .pipe(uglify()) //Сожмем наш js
        .pipe(rename({suffix: ".min"}))
        .pipe(sourcemaps.write('.')) //Пропишем карты
        .pipe(gulp.dest(path.build.js)); //Выплюнем готовый файл в build
});

gulp.task('image:build', function () {
    return gulp.src(path.src.img) //Выберем наши картинки
        .pipe(gulp.dest(path.build.img)) //Копируем изображения заранее, imagemin может пропустить парочку )
        .pipe(imagemin([
            imagemin.gifsicle({interlaced: true}),
            imageminJpegRecompress({
                progressive: true,
                max: 80,
                min: 70
            }),
            imageminPngquant({quality: '80'}),
            imagemin.svgo({
                plugins: [{removeViewBox: true},{removeXMLProcInst: true},{removeTitle: true},{removeDesc: true},{removeUselessDefs	: true},{convertTransform: true},{collapseGroups: true},{cleanupIDs: true},{removeUnusedNS: true}]
            })
        ]))
        .pipe(gulp.dest(path.build.img)); //И бросим в prod отпимизированные изображения
});


gulp.task('image:build_import', function () {
    return gulp.src(path.src.img_import) //Выберем наши картинки
        .pipe(gulp.dest(path.build.img_import)) //Копируем изображения заранее, imagemin может пропустить парочку )
        .pipe(imagemin([
            imagemin.gifsicle({interlaced: true}),
            imageminJpegRecompress({
                progressive: true,
                max: 80,
                min: 70
            }),
            imageminPngquant({quality: '80'}),
            imagemin.svgo({plugins: [{removeViewBox: true}]})
        ]))
        .pipe(gulp.dest(path.build.img_import)); //И бросим в prod отпимизированные изображения
});


gulp.task('watch', function() {
    gulp.watch([path.watch.js], ['js:build']);
    gulp.watch([path.watch.style], ['style:build']);

});


gulp.task('default', ['watch']);

package.json

{
  "name": "main_gulp",
  "version": "1.0.0",
  "description": "Main gulp css",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-autoprefixer": "^3.1.1",
    "gulp-clean-css": "^3.0.4",
    "gulp-csso": "^3.0.0",
    "gulp-group-css-media-queries": "^1.2.0",
    "gulp-imagemin": "^3.2.0",
    "gulp-rename": "^1.2.2",
    "gulp-rigger": "^0.5.8",
    "gulp-sass": "^3.1.0",
    "gulp-sourcemaps": "^2.5.0",
    "gulp-uglify": "^2.1.2",
    "gulp-watch": "^4.3.11",
    "imagemin-jpeg-recompress": "^5.1.0",
    "imagemin-pngquant": "^5.0.1"
  }
}