fix(openApp): Try alternate way of closing browser

index.js

@@ -1,13 +1,10 @@
 /* @flow */
 import type { Tab } from 'puppet-strings'
-import { promisify } from 'util'
 import { openChrome, openTab, closeBrowser } from 'puppet-strings'
 import Bundler from 'parcel-bundler'
 import tempy from 'tempy'
 import getPort from 'get-port'
 
-const sleep = promisify(setTimeout)
-
 export default async function(appPath: string): Promise<Tab> {
   const bundler = new Bundler(appPath, {
     watch: false,
@@ -25,13 +22,10 @@ export default async function(appPath: string): Promise<Tab> {
 
   // Always true--to appease the type-checker
   if (tab.puppeteer) {
-    tab.puppeteer.page.on('close', async () => {
-      // Allow enough time for Puppeteer to clean up before closing browser
-      await sleep(0)
-
-      closeBrowser(browser)
+    tab.puppeteer.page.close = async () => {
+      await closeBrowser(browser)
       server.close()
-    })
+    }
   }
 
   return tab