gulp.js: Watch all folders - gulp

Question

Ich habe gulp.js so konfiguriert, dass die Ordnerstruktur im src Order auch im dist Ordner erhalten bleibt. Alle Dateien werden also in den selben Ordner (im dist-Ordner) ausgegeben.
.
+-- src
| +-- header
| | +-- index.html
| | +-- style.scss
| +-- footer
| +-- index.html
| +-- style.scss
+-- dist
+-- header
| +-- index.html
| +-- style.css
+-- footer
+-- index.html
+-- style.css
I solved this by using a function to output the folder structure and then performing a specific task for each folder:
/* Get Folders */
function get_folders(dir) {
var folders = fs.readdirSync(dir);
var structure = [];
folders.forEach(function(folder) {
if(fs.statSync(path.join(dir, folder)).isDirectory()) {
var isParent = false;
fs.readdirSync(path.join(dir, folder)).forEach(function(subfolder) {
if(fs.statSync(path.join(dir, folder, subfolder)).isDirectory()) {
isParent = true;
structure.push(folder + "/" + subfolder);
}
});
if(!isParent) {
structure.push(path.join(folder));
}
}
});
return structure;
}
/* Generate Styles */
async function generate_styles() {
var folders = get_folders(theme.compontents.root);
return folders.map(function(folder) {
return gulp.src([...theme.static.styles, ...theme.vendor.styles, path.join(dir.src, "components", folder, '/**/*.scss')])
.pipe(sourcemaps.init())
.pipe(concat('styles.scss'))
.pipe(sass.sync({
allowEmpty: true,
outputStyle: theme.minify ? 'compressed' : 'expanded',
includePaths: ['./node_modules', './static/scss']
}))
.pipe(autoprefixer())
.pipe(sourcemaps.write('/'))
.pipe(gulp.dest(path.join(dir.dist, folder)))
});
}
/* Watch files */
function watcher() {
gulp.watch(theme.compontents.styles, generate_styles);
}
/* Init */
exports.default = gulp.series(
gulp.parallel(generate_styles),
watcher
);
The problem now is that all data, from all folders, is regenerated as soon as I change just one file. So if I make changes to the style.scss in the header folder, then the style.scss in the footer folder is also recompiled.
This is because each time a change is made, the get_folders function is called and the appropriate compilation is applied to each file. So I only need to apply this to the folder where the data has changed.