Gulp for assets

gulpfile.js

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+const {src, dest, series, parallel} = require('gulp')
+const fs = require('fs')
+const path = require('path')
+const concat = require('gulp-concat')
+const sourcemaps = require('gulp-sourcemaps')
+const babel = require('gulp-babel')
+const uglify = require('gulp-uglify')
+const rename = require('gulp-rename')
+const merge = require('merge-stream')
+const sass = require('gulp-dart-sass')
+
+let base_dir_js = 'resources/assets/scripts/'
+let output_dir_js = 'public/assets/scripts/'
+
+function getFolders(dir) {
+  return fs.readdirSync(dir)
+    .filter(function(file) {
+      return fs.statSync(path.join(dir, file)).isDirectory()
+    })
+}
+
+function bundle_base_js(done) {
+  return src(base_dir_js + '*.js')
+    .pipe(concat('main.js'))
+    .pipe(dest(output_dir_js))
+    .pipe(sourcemaps.init({loadMaps: true}))
+    .pipe(babel())
+    .pipe(uglify())
+    .pipe(rename('main.min.js'))
+    .pipe(sourcemaps.write('./'))
+    .pipe(dest(output_dir_js))
+}
+
+function bundle_js(done) {
+  let folders = getFolders(base_dir_js)
+  let tasks = folders.map(function(folder) {
+    return src(path.join(base_dir_js, folder, '**/*.js'))
+      .pipe(concat(folder + '.js', {newLine: ';'}))
+      .pipe(dest(output_dir_js))
+      .pipe(sourcemaps.init({loadMaps: true}))
+      .pipe(babel())
+      .pipe(uglify())
+      .pipe(rename(folder + '.min.js'))
+      .pipe(sourcemaps.write('./'))
+      .pipe(dest(output_dir_js))
+  })
+
+  return merge(tasks)
+}
+
+let base_dir_sass = 'resources/assets/sass/'
+let output_dir_css = 'public/assets/styles/'
+
+function bundle_base_sass(done) {
+  return src([base_dir_sass + '*.scss', '!' + base_dir_sass + '_*.scss'])
+    .pipe(sass())
+    .pipe(rename({extname: '.css'}))
+    .pipe(dest(output_dir_css))
+    .pipe(sourcemaps.init({loadMaps: true}))
+    .pipe(sass({outputStyle: 'compressed'}).on('error', sass.logError))
+    .pipe(rename({extname: '.min.css'}))
+    .pipe(sourcemaps.write('./'))
+    .pipe(dest(output_dir_css))
+}
+
+exports.default = series(bundle_base_js, bundle_js, bundle_base_sass)