6

Bun.js has a nice native API to read periodical user input:

const prompt = "Type something: ";
process.stdout.write(prompt);
for await (const line of console) {
  console.log(`You typed: ${line}`);
  process.stdout.write(prompt);
}

But...

I want to read user inputs, outside a loop!

I found this solution:

const stdinIterator = process.stdin.iterator()

console.write('What is your first name?\n> ')
const firstName = (await stdinIterator.next()).value.toString().trimEnd()
console.log('Hello,', firstName)

console.write('What is your last name?\n> ')
const lastName = (await stdinIterator.next()).value.toString().trimEnd()
console.log('Welcome', `${firstName} ${lastName}`)

It works. But then the process is not terminated automatically (I need to press Ctrl+C manually).

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2
  • Just add a break; at the end of the loop. Commented Mar 30, 2024 at 12:48
  • 2
    Directly accessing the console iterator is broken. github.com/oven-sh/bun/issues/7541 Commented Mar 30, 2024 at 12:49

2 Answers 2

Reset to default
6

Bun.js has implemented prompt API.

Use it and enjoy:

const firstName = prompt('What is your first name?')
console.log('Hello,', firstName)

const lastName = prompt('What is your last name?')
console.log('Welcome', `${firstName} ${lastName}`)

See: https://bun.sh/docs/api/globals

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Comments

1

From a comment posted by aboqasem on 2024-03-31 it's possible to close the iterator by invoking the return() method:

const iterator = console[Symbol.asyncIterator]();
const text = (await iterator.next()).value;

await iterator.return?.();

I've successfully used this in my project running Bun v1.1.17.

And because the stream is closed it allows the process to end normally without needing to ctrl + c to end it.

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1 Comment

Thanks, also not to skip process.stdout.write(prompt);

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