Gulpfile.js with sass, js, maps, config, prod task, sourcemaps

gulpfile.js

'use strict';

var gulp = require('gulp');

var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var autoprefixer = require('gulp-autoprefixer');
var sassdoc = require('sassdoc');
var minifycss = require('gulp-minify-css');

var imagemin = require('gulp-imagemin');

var uglify = require('gulp-uglify');
var concat = require('gulp-concat');

var gulpif = require('gulp-if');

var config = {
    uglify: false,
    path: {
        resources: {
            sass: './resources/assets/sass/**/*.scss',
            img: './resources/assets/img/**/*.{gif,jpg,png,svg}',
            js: './resources/assets/js/**/*.js',
        },
        public: {
            css: './public/css',
            img: './public/img',
            js: './public/js'
        }
    },
    sass: {
        errLogToConsole: true,
        outputStyle: 'expanded'
    },
    autoprefixer: {
        browsers: ['last 2 versions', '> 5%', 'Firefox ESR']
    },
    sassdoc: {
        dest: './public/sassdoc'
    },
    imagemin: {
        progressive: true
    }
};

gulp.task('sass', function () {
    return gulp
        .src(config.path.resources.sass)
        .pipe(sourcemaps.init())
        .pipe(sass(config.sass).on('error', sass.logError))
        .pipe(autoprefixer(config.autoprefixer))
        .pipe(gulpif(config.uglify, minifycss()))
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest(config.path.public.css));
});

gulp.task('sass:lite', function () {
    return gulp
        .src(config.path.resources.sass)
        .pipe(sass(config.sass).on('error', sass.logError))
        .pipe(gulp.dest(config.path.public.css));
});


gulp.task('sassdoc', function () {
    return gulp
        .src(config.path.resources.sass)
        .pipe(sassdoc(config.sassdoc))
        .resume();
});

gulp.task('sass:watch', ['sass'], function() {
    return gulp
        .watch(config.path.resources.sass, ['sass'])
        .on('change', function(event) {
            console.log('File ' + event.path + ' was ' + event.type + ', running tasks...');
        });
});

gulp.task('img', function () {
    return gulp
        .src(config.path.resources.img)
        .pipe(imagemin(config.imagemin))
        .pipe(gulp.dest(config.path.public.img));
});

gulp.task('js', function() {
    return gulp.src(config.path.resources.js)
        .pipe(sourcemaps.init())
        .pipe(concat('app.js'))
        .pipe(gulpif(config.uglify, uglify()))
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest(config.path.public.js));
});

gulp.task('js:watch', ['js'], function() {
    return gulp
        .watch(config.path.resources.js, ['js'])
        .on('change', function(event) {
            console.log('File ' + event.path + ' was ' + event.type + ', running tasks...');
        });
});

gulp.task('prod:configure',function() {
    config.uglify = true;
});

gulp.task('default', ['sass', 'img', 'js']);
gulp.task('prod', ['prod:configure', 'sass', 'sassdoc', 'img', 'js']);