Fixed gulp build

gulpfile.js

@@ -1,77 +1,71 @@
-'use strict';
+"use strict";
 
-var gulp = require('gulp'),
-    concat = require('gulp-concat'),
-    uglifycss = require('gulp-uglifycss'),
-    rename = require('gulp-rename'),
-    del = require('del'),
-    flatten = require('gulp-flatten');
+var gulp = require("gulp"),
+    concat = require("gulp-concat"),
+    uglifycss = require("gulp-uglifycss"),
+    rename = require("gulp-rename"),
+    flatten = require("gulp-flatten");
 
-gulp.task('build-css', function() {
-	gulp.src([
-        'src/app/components/common/common.css',
-		    'src/app/components/**/*.css'
+gulp.task("build-css", function() {
+	return gulp.src([
+        "src/app/components/common/common.css",
+		    "src/app/components/**/*.css"
     ])
-        .pipe(concat('primeng.css'))
-        .pipe(gulp.dest('dist/resources'));
+        .pipe(concat("primeng.css"))
+        .pipe(gulp.dest("dist/resources"));
 });
 
-gulp.task('build-css-prod', function() {
-    gulp.src([
-        'src/app/components/common/common.css',
-        'src/app/components/badge/badge.css',
-        'src/app/components/button/button.css',
-        'src/app/components/checkbox/checkbox.css',
-        'src/app/components/colorpicker/colorpicker-images.css',
-        'src/app/components/inputtext/inputtext.css',
-        'src/app/components/inputtextarea/inputtextarea.css',
-        'src/app/components/password/password.css',
-        'src/app/components/radiobutton/radiobutton.css',
-        'src/app/components/ripple/ripple.css',
-        'src/app/components/tooltip/tooltip.css'
+gulp.task("build-css-prod", function() {
+    return gulp.src([
+        "src/app/components/common/common.css",
+        "src/app/components/badge/badge.css",
+        "src/app/components/button/button.css",
+        "src/app/components/checkbox/checkbox.css",
+        "src/app/components/colorpicker/colorpicker-images.css",
+        "src/app/components/inputtext/inputtext.css",
+        "src/app/components/inputtextarea/inputtextarea.css",
+        "src/app/components/password/password.css",
+        "src/app/components/radiobutton/radiobutton.css",
+        "src/app/components/ripple/ripple.css",
+        "src/app/components/tooltip/tooltip.css"
     ])
-    .pipe(concat('primeng.css'))
-    .pipe(gulp.dest('dist/resources'))
+    .pipe(concat("primeng.css"))
+    .pipe(gulp.dest("dist/resources"))
     .pipe(uglifycss({"uglyComments": true}))
-    .pipe(rename('primeng.min.css'))
-    .pipe(gulp.dest('dist/resources'));
+    .pipe(rename("primeng.min.css"))
+    .pipe(gulp.dest("dist/resources"));
 });
 
-gulp.task('copy-component-css', function () {
-    gulp.src([
-        'src/app/components/**/*.css',
-        'src/app/components/**/images/*.png',
-        'src/app/components/**/images/*.gif'
+gulp.task("copy-component-css", function () {
+    return gulp.src([
+        "src/app/components/**/*.css",
+        "src/app/components/**/images/*.png",
+        "src/app/components/**/images/*.gif"
     ])
-    .pipe(gulp.dest('dist/resources/components'));
+    .pipe(gulp.dest("dist/resources/components"));
 });
 
-gulp.task('images', function() {
-    return gulp.src(['src/app/components/**/images/*.png', 'src/app/components/**/images/*.gif'])
+gulp.task("images", function() {
+    return gulp.src(["src/app/components/**/images/*.png", "src/app/components/**/images/*.gif"])
         .pipe(flatten())
-        .pipe(gulp.dest('dist/resources/images'));
+        .pipe(gulp.dest("dist/resources/images"));
 });
 
-gulp.task('themes', function() {
-    return gulp.src(['src/assets/components/themes/**/*',
-        '!src/assets/components/themes/soho-*/**/*',
-        '!src/assets/components/themes/viva-*/**/*',
-        '!src/assets/components/themes/mira/**/*',
-        '!src/assets/components/themes/nano/**/*'])
-        .pipe(gulp.dest('dist/resources/themes'));
-});
-
-//Cleaning previous gulp tasks from project
-gulp.task('clean', function() {
-	del(['dist/resources']);
+gulp.task("themes", function() {
+    return gulp.src(["src/assets/components/themes/**/*",
+        "!src/assets/components/themes/soho-*/**/*",
+        "!src/assets/components/themes/viva-*/**/*",
+        "!src/assets/components/themes/mira/**/*",
+        "!src/assets/components/themes/nano/**/*"])
+        .pipe(gulp.dest("dist/resources/themes"));
 });
 
 //Copy readme
-gulp.task('readme', function() {
-    gulp.src(['README.md'])
-    .pipe(gulp.dest('dist'));
+gulp.task("readme", function() {
+    return gulp.src(["README.md"])
+    .pipe(gulp.dest("dist"));
 });
 
 //Building project with run sequence
-gulp.task('build-assets', gulp.series['clean','copy-component-css', 'build-css-prod', 'images', 'themes', 'readme']);
+gulp.task("build-assets", gulp.series("copy-component-css", "build-css-prod", "images", "themes", "readme"));