Drupal 8 Theming Part 1

As continious serious of blog posts today i’m gonna write about how to setup drupal 8 development environment for Themeing

Enable TWIG Debug mode and disable Drupal cache.

Copy the example.settings.local.php file in to default folder and rename it to settings.local.php

NOTE: check whether the settings.local.php file is get enabled in the local development services

   $settings['container_yamls'][] = DRUPAL_ROOT . '/sites/development.services.yml;

Then make Drupal to read that file configurations as below

  1. Go to settings.php file
  2. And un-comment following lines of code
    if (file_exists($app_root . '/' . $site_path . '/settings.local.php')) {
        include $app_root . '/' . $site_path . '/settings.local.php;

Then enable debug and auto reload of the twig and disable cache as the figure:1 below

NOTE: You can enable these on the default.service.yml file but best practice to have it on the development.services.yml file as follow

Clear the cache for take effect and inspect the web page and see for theme suggestions as the figure:2

Enable SAAS minify & uglify and watch and live reaload.

Create a package.json file to install npm dependencies or as to get a kick start clone my repo from the below link


  "name": "cybertron-gulp",
  "version": "1.0.0",
  "description": "Gulp dependencies for cybertron theme",
  "main": "gulpfile.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  "repository": {
    "type": "git",
    "url": "https://github.com/imran031387/Drupal-8-Theme-Starter.git"
  "author": "mimran",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-autoprefixer": "^3.1.1",
    "gulp-imagemin": "^2.4.0",
    "gulp-livereload": "^3.8.1",
    "gulp-sass": "^2.3.2",
    "gulp-sourcemaps": "^1.12.0",
    "imagemin-pngquant": "^4.2.2",
    "gulp-uglify": "^3.0.0",
    "gulp-concat": "^2.6.1"

Create the gulpfile.js tasks as follow

var gulp = require('gulp');
var livereload = require('gulp-livereload');
var sass = require('gulp-sass');
var autoprefixer = require('gulp-autoprefixer');
var sourcemaps = require('gulp-sourcemaps');
var imagemin = require('gulp-imagemin');
var pngquant = require('imagemin-pngquant');
var concat = require('gulp-concat');
var rename = require('gulp-rename');
var uglify = require('gulp-uglify');

gulp.task('imagemin', function () {
    return gulp.src('./images/*')
            progressive: true,
            svgoPlugins: [{removeViewBox: false}],
            use: [pngquant()]

gulp.task('sass', function () {
        .pipe(sass({outputStyle: 'compressed'}).on('error', sass.logError))
        .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 7', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))

gulp.task('uglify', function() {
    return gulp.src('./lib/*.js')

gulp.task('watch', function(){
    gulp.watch('./sass/**/*.scss', ['sass']);
    gulp.watch('./lib/*.js', ['uglify']);
    gulp.watch(['./css/style.css', './**/*.twig', './js/*.js'], function (files){

Install the live reload chrome plugin to see the changes real time in the browser

and then type

npm install

gulp watch

and that’s it you have setup your drupal 8 themeing environment will talk next about “twig” templating engine…;)