prompt.ts

// ask your user questions on the command line in sequence
import readline from "readline";

let answer: Promise<string>;

const askQuestion = (question: string) =>
  new Promise<string>(resolve => {
    const rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout
    });
    rl.question(`${question}`, answer => {
      rl.close();
      resolve(answer);
    });
  });

const prompt = (question: string) => {
  if (answer) answer = answer.then(() => askQuestion(question));
  else answer = askQuestion(question);
  return answer;
};

export default prompt;