readDirRecursive.js

const path = require("path");

function* walkSync(dir) {
  const files = fs.readdirSync(dir, { withFileTypes: true });
  for (const file of files) {
    file.isDirectory()
      ? yield* walkSync(path.join(dir, file.name))
      : yield path.join(dir, file.name);
  }
}

const readDirRecursive = (dir) => [...walkSync(dir)];