gulp_gzip

var gzip = require('gulp-gzip');        //Add dependency to package.json if not added
 
gulp.task('gzip-app', function () {
 gulp.src(['dist/prod/src/app/bundle.min.js'])
 .pipe(gzip())
 .pipe(gulp.dest('dist/prod/src/app'));
});
 
gulp.task('gzip-css', function () {
 gulp.src(['dist/prod/src/assets/css/vendor.css'])
 .pipe(gzip())
 .pipe(gulp.dest('dist/prod/src/assets/css'));
});
 
gulp.task('gzip-vendorjs', function () {
 gulp.src(['dist/prod/src/assets/js/*.*'])
 .pipe(gzip())
 .pipe(gulp.dest('dist/prod/src/assets/js'));
});