ts/node: remove empty directories recursively. `exclude` is a list of directories to not traverse (optimization)

cleanupEmptyFolders.ts

import { readdirSync, rmdirSync, statSync } from 'node:fs';
import { basename, join } from 'node:path';

export const cleanupEmptyFolders = (
    folder: string,
    exclude: string[] = ['node_modules']
) => {
    if (!statSync(folder).isDirectory()) return;

    const folderName = basename(folder);
    if (exclude && exclude.includes(folderName)) {
        console.log(`skipping: ${folderName}`);
        return;
    }

    let files = readdirSync(folder);

    if (files.length > 0) {
        files.forEach((file) =>
            cleanupEmptyFolders(join(folder, file), exclude)
        );
        // Re-evaluate files; after deleting subfolders we may have an empty parent
        // folder now.
        files = readdirSync(folder);
    }

    if (files.length == 0) {
        console.log(`removing: ${folder}`);
        rmdirSync(folder);
    }
};