Quick Renaming of files of a directory (Node 7+)

quickRenamer.js

if (require.main !== module) throw new Error("Must not be require()d");
const fs = require("fs");
process.stdin.setEncoding("utf8");
process.openStdin();
const promisifyEvent = (emitter, event, handler, onOnce) => {
  return new Promise((res, rej) => {
    const newFunc = function() {
      const args = Array.from(arguments);
      res(handler.apply(handler, args));
    };
    emitter[onOnce](event, newFunc);
  });
};
(async function(){
  console.log("Path to use?");
  // Here you can specify a path to use instead of the actual directory
  // To stay in the current directory just press enter without anything else
  process.chdir(await promisifyEvent(process.stdin, "data", data=>{
    if (data.replace(/\s/g, "")) return data.replace(/\n/g, "");
    else return "./";
  }, "once"));
  for (const file of fs.readdirSync("./")) {
    // Log file name and await new name
    console.log(file);
    await promisifyEvent(process.stdin, "data", data=>{
      if (data.replace(/\s/g, "")) fs.renameSync(`./${file}`, `./${data.replace(/\n/g, "")}`);
    }, "once");
  }
})();