Use sequences for fontDefined and jsDefined in order to use join'ed output...

Use sequences for fontDefined and jsDefined in order to use join'ed output when at least one item is available

templates/gulpfile.js.twig

@@ -20,53 +20,41 @@ var autoprefixer = require('autoprefixer'),
     default: { env: process.env.NODE_ENV || 'development' }
   },
   options = minimist(process.argv.slice(2), knownOptions);
-
 {# This variable is needed to search for defined fonts in packages #}
-{% set fontDefined = false %}
-
+{% set fontDefined = [] %}
 {% for name, package in bower_assets %}
 {% if package.fonts is defined %}
-{% set fontDefined = true %}
+{% set fontDefined = fontDefined|merge([package.name]) %}
+
 // Provide fonts from {{ name }}
 gulp.task('fonts-{{ package.name }}', function() {
   return gulp.src('{{ package.fonts.relative }}/**')
     .pipe(gulp.dest(config.fontsPath + '/{{ package.name }}'));
 });
-
 {% endif %}
 {% endfor %}
+{% if fontDefined|length %}
 
-{% if fontDefined %}
 // Provide fonts from all libraries
-gulp.task('fonts', gulp.parallel(
-  {% for name, package in bower_assets %}
-  {% if package.fonts is defined %}'fonts-{{ package.name }}'{% if not loop.last %}, {% endif %}
-  {% endif %}
-  {% endfor %}));
+gulp.task('fonts', gulp.parallel('fonts-{{ jsDefined|join("','fonts-") }}'));
 {% endif %}
-
 {# This variable is needed to search for defined js in packages #}
-{% set jsDefined = false %}
-
+{% set jsDefined = [] %}
 {% for name, package in bower_assets %}
 {% if package.js is defined %}
-{% set jsDefined = true %}
+{% set jsDefined = jsDefined|merge([package.name]) %}
+
 // Provide JS from {{ name }}
 gulp.task('js-{{ package.name }}', function() {
   return gulp.src('{{ package.js.relative }}/**')
     .pipe(gulp.dest(config.jsPath + '/{{ package.name }}'));
 });
-
 {% endif %}
 {% endfor %}
+{% if jsDefined|length %}
 
-{% if jsDefined %}
 // Provide JS from all libraries
-gulp.task('js', gulp.parallel(
-  {% for name, package in bower_assets %}
-  {% if package.js is defined %}'js-{{ package.name }}'{% if not loop.last %}, {% endif %}
-  {% endif %}
-  {% endfor %}));
+gulp.task('js', gulp.parallel('js-{{ jsDefined|join("','js-") }}'));
 {% endif %}
 
 // Pre-process CSS
@@ -98,4 +86,4 @@ gulp.task('watch', function() {
 });
 
 // Default task: run all other tasks in the correct order
-gulp.task('default', gulp.parallel({% if fontDefined %}'fonts', {% endif %}{% if jsDefined %}'js', {% endif %}'css'));
+gulp.task('default', gulp.parallel({% if fontDefined|length %}'fonts', {% endif %}{% if jsDefined|length %}'js', {% endif %}'css'));