I use del package to delete folder:
gulp.task(\'clean\', function(){ return del(\'dist/**/*\', {force:true}); });
But if there are many sub
your code should look like this:
gulp.task('clean', function(){ return del('dist/**', {force:true}); });
according to the npm del docs "**" deletes all the subdirectories of dist (ps: don't delete dist folder):
"The glob pattern ** matches all children and the parent."
reference