From 50e6108012d93b2069140eac18dcbe2f01e68e1b Mon Sep 17 00:00:00 2001
From: John McCambridge <jmccamb@gmail.com>
Date: Wed, 17 Apr 2019 16:42:36 -0500
Subject: [PATCH] Add confirmation for closing window (#463)

* Add confirmation for closing window

* Make function an event listener for consistency

* Change let to const

* Refactor for compatability
---
 packages/ide/src/client.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/ide/src/client.ts b/packages/ide/src/client.ts
index 1cfce075..63f91bde 100644
--- a/packages/ide/src/client.ts
+++ b/packages/ide/src/client.ts
@@ -34,6 +34,12 @@ export abstract class IdeClient {
 		this.loadTime = time(2500);
 
 		let appWindow: Window | undefined;
+
+		window.addEventListener("beforeunload", (e) => {
+			e.preventDefault(); // FireFox
+			e.returnValue = ""; // Chrome
+		});
+
 		window.addEventListener("message", (event) => {
 			if (event.data === "app") {
 				appWindow = event.source as Window;