Recursively moving files in a directory with Node.js and TypeScript

index.ts

import fs from "fs";
import path from "path";

function moveFiles(sourceDir: string, targetDir: string): Promise<void> {
  return new Promise((resolve, reject) => {
    fs.readdir(sourceDir, (err, files) => {
      if (err) {
        reject(err);
        return;
      }

      files.forEach((file) => {
        const oldPath = path.join(sourceDir, file);
        const newPath = path.join(targetDir, file);
        const stat = fs.lstatSync(oldPath);

        if (stat.isDirectory()) {
          moveFiles(oldPath, targetDir)
            .then(() => {
              if (files.indexOf(file) === files.length - 1) {
                resolve();
              }
            })
            .catch((err) => reject(err));
        } else if (stat.isFile()) {
          fs.rename(oldPath, newPath, (err) => {
            if (err) {
              reject(err);
              return;
            }

            if (files.indexOf(file) === files.length - 1) {
              resolve();
            }
          });
        }
      });
    });
  });
}

moveFiles("Source Folder", "Target Folder")
  .then(() => console.log("All files moved successfully."))
  .catch((err) => console.error(err));

package.json

{
  "name": "recursive-dirs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "ts-node": "^10.9.1",
    "typescript": "^5.1.3"
  }
}