install gulp to process code

gulpfile.js

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+const gulp = require("gulp");
+const cssImport = require("gulp-cssimport");
+const rename = require("gulp-rename");
+const terser = require("gulp-terser");
+
+const paths = {
+  styles: {
+    src: "assets/css/style.css",
+  },
+  scripts: {
+    main: "assets/js/script.js",
+    calendar: "assets/js/calendar.js",
+    swiper: "assets/js/swiper.js",
+  },
+  dest: "assets/dist/",
+};
+
+function packCss() {
+  return gulp
+    .src(paths.styles.src)
+    .pipe(cssImport())
+    .pipe(gulp.dest(paths.dest));
+}
+
+function minifyMainJS() {
+  return gulp
+    .src(paths.scripts.main)
+    .pipe(rename("script.min.js"))
+    .pipe(terser())
+    .pipe(gulp.dest(paths.dest));
+}
+function minifyCalendarJS() {
+  return gulp
+    .src(paths.scripts.calendar)
+    .pipe(rename("calendar.min.js"))
+    .pipe(terser())
+    .pipe(gulp.dest(paths.dest));
+}
+function minifySwiperJS() {
+  return gulp
+    .src(paths.scripts.swiper)
+    .pipe(rename("swiper.min.js"))
+    .pipe(terser())
+    .pipe(gulp.dest(paths.dest));
+}
+
+exports.default = gulp.parallel(
+  packCss,
+  minifyMainJS,
+  minifyCalendarJS,
+  minifySwiperJS
+);