Async Node.JS CLI Prompt / Question Using Built-in Modules

cli.js

const { promisify } = require('util');
const rl = require('readline');
const readline = rl.createInterface({
    input: process.stdin,
    output: process.stdout,
});

// Prepare readline.question for promisification
readline.question[promisify.custom] = (question) => {
    return new Promise((resolve) => {
        readline.question(question, resolve);
    });
};

// Helper function for input prompts. Not required, can use `promisify(readline.question)(...)` directly.
const prompt = (prompt_str, append_trailing_space = true) =>
    promisify(readline.question)(
        append_trailing_space ? String(prompt_str).trim() + ' ' : prompt_str
    );

// For Node environments without top-level `await`
(async () => {
    let answer = await prompt('What is your name?');
    console.log('You answered', answer);

    // When you are done prompting for inputs, make sure to close your readline interface.
    // Otherwise your process will not exit
    readline.close();
})();