add support for gulp v4

templates/gulpfile.js.twig

@@ -21,8 +21,12 @@ var autoprefixer = require('autoprefixer'),
   },
   options = minimist(process.argv.slice(2), knownOptions);
 
+{# This variable is needed to search for defined fonts in packages #}
+{% set fontDefined = false %}
+
 {% for name, package in bower_assets %}
 {% if package.fonts is defined %}
+{% set fontDefined = true %}
 // Provide fonts from {{ name }}
 gulp.task('fonts-{{ package.name }}', function() {
   return gulp.src('{{ package.fonts.relative }}/**')
@@ -32,7 +36,7 @@ gulp.task('fonts-{{ package.name }}', function() {
 {% endif %}
 {% endfor %}
 // Provide fonts from all libraries
-gulp.task('fonts', [{% for name, package in bower_assets %}{% if package.fonts is defined %}'fonts-{{ package.name }}', {% endif %}{% endfor %}]);
+gulp.task('fonts', {% if fontDefined %}gulp.series(gulp.parallel({% for name, package in bower_assets %}{% if package.fonts is defined %}'fonts-{{ package.name }}', {% endif %}{% endfor %})){% endif %});
 
 {% for name, package in bower_assets %}
 {% if package.js is defined %}
@@ -45,7 +49,7 @@ gulp.task('js-{{ package.name }}', function() {
 {% endif %}
 {% endfor %}
 // Provide JS from all libraries
-gulp.task('js', [{% for name, package in bower_assets %}{% if package.js is defined %}'js-{{ package.name }}', {% endif %}{% endfor %}]);
+gulp.task('js', {% if fontDefined %}gulp.series(gulp.parallel({% for name, package in bower_assets %}{% if package.js is defined %}'js-{{ package.name }}', {% endif %}{% endfor %})){% endif %});
 
 // Pre-process CSS
 gulp.task('css', function() {
@@ -72,8 +76,8 @@ gulp.task('css', function() {
 
 // Rerun the task when a file changes
 gulp.task('watch', function() {
-  gulp.watch(config.sassPath + '/**/*.scss', ['css']);
+  gulp.watch(config.sassPath + '/**/*.scss', gulp.parallel('css'));
 });
 
 // Default task: run all other tasks in the correct order
-gulp.task('default', ['fonts', 'js', 'css']);
+gulp.task('default', gulp.series(gulp.parallel('fonts', 'js', 'css')));

templates/package.json

@@ -5,7 +5,7 @@
   },
   "dependencies": {
     "autoprefixer": "^7.1.1",
-    "gulp": "^3.9.0",
+    "gulp": "^4.0.0",
     "gulp-if": "^2.0.0",
     "gulp-notify": "^2.2.0",
     "gulp-postcss": "^7.0.0",