1 files changed, 1 insertions, 76 deletions

diff --git a/runtime/js/01_web_util.js b/runtime/js/01_web_util.js
index 9b51021f9..ca3d74826 100644
--- a/runtime/js/01_web_util.js
+++ b/runtime/js/01_web_util.js
@@ -2,15 +2,7 @@
 "use strict";
 
 ((window) => {
-  const {
-    FunctionPrototypeCall,
-    Map,
-    MapPrototypeGet,
-    MapPrototypeSet,
-    ObjectDefineProperty,
-    TypeError,
-    Symbol,
-  } = window.__bootstrap.primordials;
+  const { TypeError, Symbol } = window.__bootstrap.primordials;
   const illegalConstructorKey = Symbol("illegalConstructorKey");
 
   function requiredArguments(
@@ -26,75 +18,8 @@
     }
   }
 
-  const handlerSymbol = Symbol("eventHandlers");
-  function makeWrappedHandler(handler, isSpecialErrorEventHandler) {
-    function wrappedHandler(...args) {
-      if (typeof wrappedHandler.handler !== "function") {
-        return;
-      }
-      if (isSpecialErrorEventHandler) {
-        const evt = args[0];
-        if (evt instanceof ErrorEvent && evt.type === "error") {
-          const ret = FunctionPrototypeCall(
-            wrappedHandler.handler,
-            this,
-            evt.message,
-            evt.filename,
-            evt.lineno,
-            evt.colno,
-            evt.error,
-          );
-          if (ret === true) {
-            evt.preventDefault();
-          }
-          return;
-        }
-      }
-
-      return FunctionPrototypeCall(wrappedHandler.handler, this, ...args);
-    }
-    wrappedHandler.handler = handler;
-    return wrappedHandler;
-  }
-  function defineEventHandler(
-    emitter,
-    name,
-    defaultValue = undefined,
-    isSpecialErrorEventHandler = false,
-  ) {
-    // HTML specification section 8.1.5.1
-    ObjectDefineProperty(emitter, `on${name}`, {
-      get() {
-        if (!this[handlerSymbol]) {
-          return defaultValue;
-        }
-
-        return MapPrototypeGet(this[handlerSymbol], name)?.handler ??
-          defaultValue;
-      },
-      set(value) {
-        if (!this[handlerSymbol]) {
-          this[handlerSymbol] = new Map();
-        }
-        let handlerWrapper = MapPrototypeGet(this[handlerSymbol], name);
-        if (handlerWrapper) {
-          handlerWrapper.handler = value;
-        } else {
-          handlerWrapper = makeWrappedHandler(
-            value,
-            isSpecialErrorEventHandler,
-          );
-          this.addEventListener(name, handlerWrapper);
-        }
-        MapPrototypeSet(this[handlerSymbol], name, handlerWrapper);
-      },
-      configurable: true,
-      enumerable: true,
-    });
-  }
   window.__bootstrap.webUtil = {
     illegalConstructorKey,
     requiredArguments,
-    defineEventHandler,
   };
 })(this);