deno-prompt-with-ctrlc.ts

// prompt can not catch ctrl-c
const ret = prompt('input>');
console.log(ret); // SIGINT interrupt before this line

// returns null with ctrl-c if signal handler is registerred.
function getInput(message: string): string | null {
  const handler = () => {};
  Deno.addSignalListener('SIGINT', handler);
  const ret = prompt(message);
  Deno.removeSignalListener('SIGINT', handler);
  return ret;
}

const out = getInput('input>');
console.log(out) // returns null with ctrl-c