close keypress stream when rl close (#835)

Author: PG Herveou

packages/inquirer/lib/utils/events.js

@@ -1,13 +1,14 @@
 'use strict';
 var { fromEvent } = require('rxjs');
-var { filter, map, share } = require('rxjs/operators');
+var { filter, map, share, takeUntil } = require('rxjs/operators');
 
 function normalizeKeypressEvents(value, key) {
   return { value: value, key: key || {} };
 }
 
 module.exports = function(rl) {
   var keypress = fromEvent(rl.input, 'keypress', normalizeKeypressEvents)
+    .pipe(takeUntil(fromEvent(rl, 'close')))
     // Ignore `enter` key. On the readline, we only care about the `line` event.
     .pipe(filter(({ key }) => key.name !== 'enter' && key.name !== 'return'));