gulpfile.js

"use strict";

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() {
    return gulp
        .src(["src/components/common/Common.css", "src/components/**/*.css"])
        .pipe(concat("primevue.css"))
        .pipe(gulp.dest("dist/resources"))
        .pipe(uglifycss({ uglyComments: true }))
        .pipe(rename("primevue.min.css"))
        .pipe(gulp.dest("dist/resources"));
});

gulp.task("build-themes", function() {
    return gulp
        .src([
            "public/themes/**/*",
            "!public/themes/soho-*/**/*",
            "!public/themes/viva-*/**/*",
            "!public/themes/mira/**/*",
            "!public/themes/nano/**/*"
        ])
        .pipe(gulp.dest("dist/resources/themes"));
});

gulp.task("images", function() {
    return gulp
        .src([
            "src/components/**/images/*.png",
            "src/components/**/images/*.gif"
        ])
        .pipe(flatten())
        .pipe(gulp.dest("dist/resources/images"));
});

//Building project with run sequence
gulp.task("build-styles", gulp.series("build-css", "images", "build-themes"));