From b566d184fedcd0fae3de19a54adfa5ce09466cc1 Mon Sep 17 00:00:00 2001
From: Benjamin Gruenbaum <benjamingr@gmail.com>
Date: Mon, 7 Dec 2020 22:22:58 +0200
Subject: refactor(cli/rt): deduplicate code (#8649)

---
 cli/rt/01_web_util.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'cli/rt/01_web_util.js')

diff --git a/cli/rt/01_web_util.js b/cli/rt/01_web_util.js
index 3076993ff..a9573a71d 100644
--- a/cli/rt/01_web_util.js
+++ b/cli/rt/01_web_util.js
@@ -128,11 +128,11 @@
     wrappedHandler.handler = handler;
     return wrappedHandler;
   }
-  function defineEventHandler(emitter, name) {
+  function defineEventHandler(emitter, name, defaultValue = undefined) {
     // HTML specification section 8.1.5.1
     Object.defineProperty(emitter, `on${name}`, {
       get() {
-        return this[handlerSymbol]?.get(name)?.handler;
+        return this[handlerSymbol]?.get(name)?.handler ?? defaultValue;
       },
       set(value) {
         if (!this[handlerSymbol]) {
-- 
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