From 57fd6f06047a1a2a3a46fe8b23ff585293a40062 Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Mon, 13 Jul 2020 08:41:54 -0400
Subject: [PATCH] Updated WebSocketProvider to use web-style event listener
 API.

---
 packages/providers/src.ts/websocket-provider.ts | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/providers/src.ts/websocket-provider.ts b/packages/providers/src.ts/websocket-provider.ts
index 1b8958ec1a..d0caa9e2c1 100644
--- a/packages/providers/src.ts/websocket-provider.ts
+++ b/packages/providers/src.ts/websocket-provider.ts
@@ -278,15 +278,15 @@ export class WebSocketProvider extends JsonRpcProvider {
     async destroy(): Promise<void> {
         // Wait until we have connected before trying to disconnect
         if (this._websocket.readyState === WebSocket.CONNECTING) {
-            await new Promise((resolve) => {
-                this._websocket.on("open", () => {
+            await (new Promise((resolve) => {
+                this._websocket.onopen = function() {
                     resolve(true);
-                });
+                };
 
-                this._websocket.on("error", () => {
+                this._websocket.onerror = function() {
                     resolve(false);
-                });
-            });
+                };
+            }));
         }
 
         // Hangup (navigating away from the page that opened the connection)