mattrbeck · Aug 31, 2026 · Aug 27, 2026
diff --git a/packages/zone.js/lib/common/events.ts b/packages/zone.js/lib/common/events.ts
@@ -92,6 +92,11 @@ export const globalSources: any = {};
 const EVENT_NAME_SYMBOL_REGX = new RegExp('^' + ZONE_SYMBOL_PREFIX + '(\\w+)(true|false)$');
 const IMMEDIATE_PROPAGATION_SYMBOL = zoneSymbol('propagationStopped');
 
+// Recognised members of the `AddEventListenerOptions` WebIDL dictionary, used
+// by `copyEventListenerOptions` to recover accessors and non-enumerable
+// properties that a caller-supplied options object may expose.
+const KNOWN_EVENT_LISTENER_OPTIONS = ['capture', 'once', 'passive', 'signal'];
+
 function prepareEventNames(eventName: string, eventNameToString?: (eventName: string) => string) {
   const falseEventName = (eventNameToString ? eventNameToString(eventName) : eventName) + FALSE_STR;
   const trueEventName = (eventNameToString ? eventNameToString(eventName) : eventName) + TRUE_STR;
@@ -381,7 +386,8 @@ export function patchEventTarget(
         return {passive: true};
       }
       if (typeof options === 'object' && options.passive !== false) {
-        return {...options, passive: true};
+        options.passive = true;
+        return options;
       }
       return options;
     }
@@ -492,27 +498,22 @@ export function patchEventTarget(
     const passiveEvents: string[] = _global[zoneSymbol('PASSIVE_EVENTS')];
 
     function copyEventListenerOptions(options: any) {
-      if (typeof options === 'object' && options !== null) {
-        // We need to destructure the target `options` object since it may
-        // be frozen or sealed (possibly provided implicitly by a third-party
-        // library), or its properties may be readonly.
-        const newOptions: any = {...options};
-        // The `signal` option was recently introduced, which caused regressions in
-        // third-party scenarios where `AbortController` was directly provided to
-        // `addEventListener` as options. For instance, in cases like
-        // `document.addEventListener('keydown', callback, abortControllerInstance)`,
-        // which is valid because `AbortController` includes a `signal` getter, spreading
-        // `{...options}` wouldn't copy the `signal`. Additionally, using `Object.create`
-        // isn't feasible since `AbortController` is a built-in object type, and attempting
-        // to create a new object directly with it as the prototype might result in
-        // unexpected behavior.
-        if (options.signal) {
-          newOptions.signal = options.signal;
+      if (typeof options !== 'object' || options === null) {
+        return options;
+      }
+      // Spread copies own enumerable properties, invoking any getters exactly once.
+      const newOptions: any = {...options};
+      // Anything the spread could not see (inherited accessors such as
+      // `AbortController.prototype.signal`, or non-enumerable properties defined
+      // via `Object.defineProperty`) is read directly from the source, exactly once. Reading
+      // from `options` rather than `newOptions` also gives prototype getters the
+      // correct receiver.
+      for (const key of KNOWN_EVENT_LISTENER_OPTIONS) {
+        if (!Object.hasOwn(newOptions, key) && key in options) {
+          newOptions[key] = options[key];
         }
-        return newOptions;
       }
-
-      return options;
+      return newOptions;
     }
 
     const makeAddListener = function (
@@ -556,7 +557,7 @@ export function patchEventTarget(
         }
 
         const passive = !!passiveEvents && passiveEvents.indexOf(eventName) !== -1;
-        const options = copyEventListenerOptions(buildEventListenerOptions(arguments[2], passive));
+        const options = buildEventListenerOptions(copyEventListenerOptions(arguments[2]), passive);
         const signal: AbortSignal | undefined = options?.signal;
         if (signal?.aborted) {
           // the signal is an aborted one, just return without attaching the event listener.

diff --git a/packages/zone.js/test/browser/browser.spec.ts b/packages/zone.js/test/browser/browser.spec.ts
@@ -2184,6 +2184,73 @@ describe('Zone Browser', function () {
         expect(logs).toEqual(['click2']);
       });
 
+      // Options exposed as accessors or non-enumerable properties must still
+      // reach the native call. https://github.com/angular/angular/issues/54142
+      describe('event listener options built with accessors', function () {
+        it('should invoke a non-enumerable `passive` getter (MDN feature-detect pattern)', function () {
+          let getCount = 0;
+          const opts = Object.defineProperty({}, 'passive', {
+            get: () => {
+              getCount++;
+              return false;
+            },
+          });
+          const listener = () => {};
+          button.addEventListener('click', listener, opts as any);
+          expect(getCount).toBe(1);
+          button.removeEventListener('click', listener, opts as any);
+        });
+
+        it('should honour `capture: true` supplied as an accessor', function () {
+          const opts = Object.defineProperty({}, 'capture', {get: () => true});
+          const inner = document.createElement('span');
+          button.appendChild(inner);
+          let phase = -1;
+          const listener = (e: Event) => {
+            phase = e.eventPhase;
+          };
+          button.addEventListener('click', listener, opts as any);
+          inner.dispatchEvent(clickEvent);
+          expect(phase).toBe(Event.CAPTURING_PHASE);
+
+          button.removeEventListener('click', listener, opts as any);
+          phase = -1;
+          inner.dispatchEvent(clickEvent);
+          expect(phase).toBe(-1);
+          button.removeChild(inner);
+        });
+
+        it('should honour `once: true` supplied as an accessor', function () {
+          const opts = Object.defineProperty({}, 'once', {get: () => true});
+          let callCount = 0;
+          button.addEventListener('click', () => callCount++, opts as any);
+          button.dispatchEvent(clickEvent);
+          button.dispatchEvent(clickEvent);
+          expect(callCount).toBe(1);
+        });
+
+        // `AbortController.prototype.signal` is a prototype accessor, so an
+        // own-properties-only copy would drop it.
+        it('should honour `signal` on an AbortController passed as options', function () {
+          const ac = new AbortController();
+          const logs: string[] = [];
+          button.addEventListener('click', () => logs.push('click'), ac);
+          button.dispatchEvent(clickEvent);
+          ac.abort();
+          button.dispatchEvent(clickEvent);
+          expect(logs).toEqual(['click']);
+          expect(button.eventListeners!('click').length).toBe(0);
+        });
+
+        // https://github.com/angular/angular/pull/55796
+        it('should accept a frozen options object', function () {
+          const opts = Object.freeze({capture: true, once: true});
+          const listener = () => {};
+          expect(() => button.addEventListener('click', listener, opts as any)).not.toThrow();
+          button.removeEventListener('click', listener, opts as any);
+        });
+      });
+
       // https://github.com/angular/angular/issues/56148
       it('should store the remove abort listener on the task itself and not the task data', function () {
         const logs: string[] = [];