prettier-sanctuary/lib/list-files.js

const fs = require("fs");
const path = require("path");

const isDirectory = (s) => {
  try {
    return fs.lstatSync(s).isDirectory();
  } catch (e) {
    return false;
  }
};

const isFile = (s) => {
  try {
    return fs.lstatSync(s).isFile();
  } catch (e) {
    return false;
  }
};

const listAllFilesInDir = (dirPath) =>
  fs
    .readdirSync(dirPath)
    .map((f) => path.resolve(dirPath, f))
    .map((s) => (isDirectory(s) ? listAllFilesInDir(s) : s))
    .flat(Infinity);

const listFilesByArgs = (args) =>
  args.length === 1 && isDirectory(args[0])
    ? listAllFilesInDir(args[0]).map((f) => f.replace(process.cwd() + "/", ""))
    : args.filter(isFile);

module.exports = { listAllFilesInDir, listFilesByArgs };