Simple CLI Tool for Node.js

cli.js

const readline = require('readline');
const process = require('process');

module.exports.ask = (question) => new Promise((resolve) => {
  const createdInterface = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
  });
  createdInterface.question(`${question} `, (answer) => {
    createdInterface.close();
    resolve(answer);
  });
});

module.exports.write = console.log;

module.exports.loading = (prefix = '') => {
  const std = process.stdout;
  const spinnerData = ['.  ', '.. ', '...', ' ..', '  .', '   ', '   '];
  let index = 0;
  process.stdout.write('\x1B[?25l');
  const length = spinnerData[0].length + prefix.length + 1;
  const interval = setInterval(() => {
    const str = `${prefix} ${spinnerData[index]}`;
    std.write(str);
    index = index + 1 >= spinnerData.length ? 0 : index + 1;
    readline.moveCursor(std, -1 * length, 0);
  }, 90);
  return {
    finish() {
      clearInterval(interval);
      readline.clearLine(std);
    },
  };
};


module.exports.getArg = (key) => {
  const args = process.argv.slice(2);
  const index = args.indexOf(key);
  if (index !== -1 && typeof args[index + 1] !== 'undefined') {
    return args[index + 1];
  }
};

module.exports.hasArg = (key) => {
  const args = process.argv.slice(2);
  const index = args.indexOf(key);
  return index !== -1;
};

module.exports.args = () => {
  return process.argv.slice(2);
};