nodeで対話型プログラムを作成する方法

import * as readline from "readline";

class Repl {
  rl: readline.Interface;

  constructor() {
    this.rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
    });
  }
  async start(prompt = "> ") {
    while (1) {
      await this.readSyncLine(prompt, async (text) => {
        if (text !== "") {
          console.log(text);
          return;
        }
      });
    }
  }

  async readSyncLine(
    prompt: string,
    cb: (text: string) => void
  ): Promise<void> {
    return new Promise((resolve) => {
      this.rl.question(prompt, (answer) => {
        cb(answer);
        resolve();
      });
    });
  }
}

const r = new Repl();

r.start();