язделяль

export const findFile = (node, fn, pathToFile = '')  => {
  const filePath = path.join(pathToFile, node.name);
  if (node.type === 'directory') {
    return node.children
      .map(element => findFile(element, fn, filePath))
      .reduce((res, found) => [...res, ...found], []);
  }
  if (fn(node)) {
    return [filePath];
  }
  return [];
};

export default (tree, str) => findFile(tree, node => node.type === 'file' && node.name.includes(str));