Fixing gulp file

gulpfile.js

@@ -1,21 +1,22 @@
+const { src, dest, series } = require('gulp');
 const gulp = require('gulp');
 const cleanCSS = require('gulp-clean-css');
 const minify = require('gulp-minify');
 const rename = require('gulp-rename');
 
-gulp.task('compressJS', () => {
-    return gulp.src(['public/javascripts/*.js', '!public/javascripts/*.min.js'])
+function compressJS(){
+    return src(['public/javascripts/*.js', '!public/javascripts/*.min.js'])
         .pipe(minify({
             ext: {
                 src: '.js',
                 min: '.min.js'
             }
         }))
-        .pipe(gulp.dest('public/javascripts'));
-});
+        .pipe(dest('public/javascripts'));
+};
 
-gulp.task('compressCss', () => {
-    return gulp.src(['public/stylesheets/*.css',
+function compressCss(){
+    return src(['public/stylesheets/*.css',
             '!public/stylesheets/*.min.css'
         ])
         .pipe(cleanCSS({ compatibility: 'ie8' }))
@@ -23,21 +24,19 @@ gulp.task('compressCss', () => {
             dirname: 'public/stylesheets',
             extname: '.min.css'
         }))
-        .pipe(gulp.dest('./'));
-});
+        .pipe(dest('./'));
+};
 
-gulp.task('compressThemeCss', () => {
-    return gulp.src(['views/themes/**/*.css',
+function compressThemeCss(){
+    return src(['views/themes/**/*.css',
             '!views/themes/**/*.min.css'
         ])
         .pipe(cleanCSS({ compatibility: 'ie8' }))
         .pipe(rename({
             extname: '.min.css'
         }))
-        .pipe(gulp.dest('views/themes/'));
-});
+        .pipe(dest('views/themes/'));
+};
 
 // run the tasks
-gulp.task('deploy', gulp.series('compressJS', 'compressCss', 'compressThemeCss', (done) => {
-    done();
-}));
+gulp.task('default', series(compressJS, compressCss, compressThemeCss));