1 files changed, 12 insertions, 4 deletions
diff --git a/ws/mod.ts b/ws/mod.ts
index 7d8200dfc..2ae6cabda 100644
--- a/ws/mod.ts
+++ b/ws/mod.ts
@@ -31,19 +31,25 @@ export interface WebSocketCloseEvent {
   reason?: string;
 }
 
-export function isWebSocketCloseEvent(a): a is WebSocketCloseEvent {
-  return a && typeof a["code"] === "number";
+export function isWebSocketCloseEvent(
+  a: WebSocketEvent
+): a is WebSocketCloseEvent {
+  return typeof a === "object" && a.hasOwnProperty("code");
 }
 
 export type WebSocketPingEvent = ["ping", Uint8Array];
 
-export function isWebSocketPingEvent(a): a is WebSocketPingEvent {
+export function isWebSocketPingEvent(
+  a: WebSocketEvent
+): a is WebSocketPingEvent {
   return Array.isArray(a) && a[0] === "ping" && a[1] instanceof Uint8Array;
 }
 
 export type WebSocketPongEvent = ["pong", Uint8Array];
 
-export function isWebSocketPongEvent(a): a is WebSocketPongEvent {
+export function isWebSocketPongEvent(
+  a: WebSocketEvent
+): a is WebSocketPongEvent {
   return Array.isArray(a) && a[0] === "pong" && a[1] instanceof Uint8Array;
 }
 
@@ -436,6 +442,8 @@ async function handshake(
   if (!m) {
     throw new Error("ws: invalid status line: " + statusLine);
   }
+
+  // @ts-ignore
   const { version, statusCode } = m.groups;
   if (version !== "HTTP/1.1" || statusCode !== "101") {
     throw new Error(