method Interface.prototype.question
Usage in Deno
import { Interface } from "node:readline";
Interface.prototype.question(query: string,callback: (answer: string) => void,): void
The rl.question()
method displays the query
by writing it to the output
,
waits for user input to be provided on input
, then invokes the callback
function passing the provided input as the first argument.
When called, rl.question()
will resume the input
stream if it has been
paused.
If the Interface
was created with output
set to null
or undefined
the query
is not written.
The callback
function passed to rl.question()
does not follow the typical
pattern of accepting an Error
object or null
as the first argument.
The callback
is called with the provided answer as the only argument.
An error will be thrown if calling rl.question()
after rl.close()
.
Example usage:
rl.question('What is your favorite food? ', (answer) => {
console.log(`Oh, so your favorite food is ${answer}`);
});
Using an AbortController
to cancel a question.
const ac = new AbortController();
const signal = ac.signal;
rl.question('What is your favorite food? ', { signal }, (answer) => {
console.log(`Oh, so your favorite food is ${answer}`);
});
signal.addEventListener('abort', () => {
console.log('The food question timed out');
}, { once: true });
setTimeout(() => ac.abort(), 10000);
void