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gulpfile.js

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+const {src, dest, parallel} = require('gulp');
+const sass = require('gulp-sass');
+const minifyCSS = require('gulp-csso');
+const concat = require('gulp-concat');
+const browserify = require('gulp-browserify');
+
+function css() {
+    return src('styles/*.scss')
+        .pipe(sass())
+        .pipe(minifyCSS())
+        .pipe(concat('bundle.css'))
+        .pipe(dest('public'))
+}
+
+function js() {
+    return src('src/index.js')
+        .pipe(browserify({
+            insertGlobals: true,
+        }))
+        .pipe(dest('public'))
+}
+
+exports.js = js;
+exports.css = css;
+exports.default = parallel(css, js);