experiment(ext/web): Don't expose event classes during the bootstrap phase (#16213)

ext/broadcast_channel/01_broadcast_channel.js

@@ -8,7 +8,9 @@
   const core = window.Deno.core;
   const ops = core.ops;
   const webidl = window.__bootstrap.webidl;
-  const { defineEventHandler, setTarget } = window.__bootstrap.event;
+  const { MessageEvent, defineEventHandler, setTarget } =
+    window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const { DOMException } = window.__bootstrap.domException;
   const {
     ArrayPrototypeIndexOf,

ext/flash/01_http.js

@@ -7,6 +7,7 @@
   const { fromFlashRequest, toInnerResponse, _flash } =
     window.__bootstrap.fetch;
   const core = window.Deno.core;
+  const { Event } = window.__bootstrap.event;
   const {
     ReadableStream,
     ReadableStreamPrototype,

ext/http/01_http.js

@@ -4,6 +4,7 @@
 ((window) => {
   const webidl = window.__bootstrap.webidl;
   const { InnerBody } = window.__bootstrap.fetchBody;
+  const { Event } = window.__bootstrap.event;
   const { setEventTargetData } = window.__bootstrap.eventTarget;
   const { BlobPrototype } = window.__bootstrap.file;
   const {

ext/web/02_event.js

@@ -1471,19 +1471,6 @@
     reportException(error);
   }
 
-  window[webidl.brand] = webidl.brand;
-  window.Event = Event;
-  window.EventTarget = EventTarget;
-  window.ErrorEvent = ErrorEvent;
-  window.CloseEvent = CloseEvent;
-  window.MessageEvent = MessageEvent;
-  window.CustomEvent = CustomEvent;
-  window.ProgressEvent = ProgressEvent;
-  window.PromiseRejectionEvent = PromiseRejectionEvent;
-  window.dispatchEvent = EventTarget.prototype.dispatchEvent;
-  window.addEventListener = EventTarget.prototype.addEventListener;
-  window.removeEventListener = EventTarget.prototype.removeEventListener;
-  window.reportError = reportError;
   window.__bootstrap.eventTarget = {
     EventTarget,
     setEventTargetData,
@@ -1494,5 +1481,13 @@
     setIsTrusted,
     setTarget,
     defineEventHandler,
+    Event,
+    ErrorEvent,
+    CloseEvent,
+    MessageEvent,
+    CustomEvent,
+    ProgressEvent,
+    PromiseRejectionEvent,
+    reportError,
   };
 })(this);

ext/web/03_abort_signal.js

@@ -6,8 +6,8 @@
 
 ((window) => {
   const webidl = window.__bootstrap.webidl;
-  const { setIsTrusted, defineEventHandler } = window.__bootstrap.event;
-  const { listenerCount } = window.__bootstrap.eventTarget;
+  const { Event, setIsTrusted, defineEventHandler } = window.__bootstrap.event;
+  const { EventTarget, listenerCount } = window.__bootstrap.eventTarget;
   const {
     Set,
     SetPrototypeAdd,
@@ -185,9 +185,9 @@
     }
   }
 
-  window.AbortSignal = AbortSignal;
-  window.AbortController = AbortController;
   window.__bootstrap.abortSignal = {
+    AbortSignal,
+    AbortController,
     AbortSignalPrototype,
     add,
     signalAbort,

ext/web/04_global_interfaces.js

@@ -5,7 +5,7 @@
 /// <reference path="../../core/internal.d.ts" />
 
 ((window) => {
-  const { EventTarget } = window;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const {
     Symbol,
     SymbolToStringTag,

ext/web/10_filereader.js

@@ -15,6 +15,8 @@
 ((window) => {
   const webidl = window.__bootstrap.webidl;
   const { forgivingBase64Encode } = window.__bootstrap.infra;
+  const { ProgressEvent } = window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const { decode, TextDecoder } = window.__bootstrap.encoding;
   const { parseMimeType } = window.__bootstrap.mimesniff;
   const { DOMException } = window.__bootstrap.domException;

ext/web/13_message_port.js

@@ -12,8 +12,8 @@
   const core = window.Deno.core;
   const { InterruptedPrototype, ops } = core;
   const webidl = window.__bootstrap.webidl;
-  const { setEventTargetData } = window.__bootstrap.eventTarget;
-  const { defineEventHandler } = window.__bootstrap.event;
+  const { EventTarget, setEventTargetData } = window.__bootstrap.eventTarget;
+  const { MessageEvent, defineEventHandler } = window.__bootstrap.event;
   const { DOMException } = window.__bootstrap.domException;
   const {
     ArrayBufferPrototype,

ext/web/15_performance.js

@@ -18,6 +18,7 @@
 
   const { webidl, structuredClone } = window.__bootstrap;
   const consoleInternal = window.__bootstrap.console;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const { opNow } = window.__bootstrap.timers;
   const { DOMException } = window.__bootstrap.domException;
 

ext/web/internal.d.ts

@@ -70,6 +70,17 @@ declare namespace globalThis {
       EventTarget: typeof EventTarget;
     };
 
+    declare var event: {
+      Event: typeof event;
+      ErrorEvent: typeof ErrorEvent;
+      CloseEvent: typeof CloseEvent;
+      MessageEvent: typeof MessageEvent;
+      CustomEvent: typeof CustomEvent;
+      ProgressEvent: typeof ProgressEvent;
+      PromiseRejectionEvent: typeof PromiseRejectionEvent;
+      reportError: typeof reportError;
+    };
+
     declare var location: {
       getLocationHref(): string | undefined;
     };

ext/websocket/01_websocket.js

@@ -10,7 +10,9 @@
   const webidl = window.__bootstrap.webidl;
   const { HTTP_TOKEN_CODE_POINT_RE } = window.__bootstrap.infra;
   const { DOMException } = window.__bootstrap.domException;
-  const { defineEventHandler } = window.__bootstrap.event;
+  const { Event, ErrorEvent, CloseEvent, MessageEvent, defineEventHandler } =
+    window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const { Blob, BlobPrototype } = globalThis.__bootstrap.file;
   const {
     ArrayBufferPrototype,

runtime/js/10_permissions.js

@@ -2,13 +2,11 @@
 "use strict";
 
 ((window) => {
-  const {
-    Event,
-    EventTarget,
-    Deno: { core: { ops } },
-    __bootstrap: { webUtil: { illegalConstructorKey } },
-  } = window;
+  const { ops } = Deno.core;
+  const { Event } = window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const { pathFromURL } = window.__bootstrap.util;
+  const { illegalConstructorKey } = window.__bootstrap.webUtil;
   const {
     ArrayIsArray,
     ArrayPrototypeIncludes,

runtime/js/11_workers.js

@@ -17,7 +17,9 @@
   const { getLocationHref } = window.__bootstrap.location;
   const { serializePermissions } = window.__bootstrap.permissions;
   const { log } = window.__bootstrap.util;
-  const { defineEventHandler } = window.__bootstrap.event;
+  const { ErrorEvent, MessageEvent, defineEventHandler } =
+    window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const {
     deserializeJsMessageData,
     serializeJsMessageData,

runtime/js/30_os.js

@@ -4,12 +4,14 @@
 ((window) => {
   const core = window.Deno.core;
   const ops = core.ops;
+  const { Event } = window.__bootstrap.event;
+  const { EventTarget } = window.__bootstrap.eventTarget;
   const {
     Error,
     SymbolFor,
   } = window.__bootstrap.primordials;
 
-  const windowDispatchEvent = window.dispatchEvent.bind(window);
+  const windowDispatchEvent = EventTarget.prototype.dispatchEvent.bind(window);
 
   function loadavg() {
     return ops.op_loadavg();

runtime/js/99_main.js

@@ -39,6 +39,7 @@ delete Intl.v8BreakIterator;
     WeakMapPrototypeSet,
   } = window.__bootstrap.primordials;
   const util = window.__bootstrap.util;
+  const event = window.__bootstrap.event;
   const eventTarget = window.__bootstrap.eventTarget;
   const globalInterfaces = window.__bootstrap.globalInterfaces;
   const location = window.__bootstrap.location;
@@ -78,6 +79,7 @@ delete Intl.v8BreakIterator;
   const errors = window.__bootstrap.errors.errors;
   const webidl = window.__bootstrap.webidl;
   const domException = window.__bootstrap.domException;
+  const abortSignal = window.__bootstrap.abortSignal;
   const { defineEventHandler, reportException } = window.__bootstrap.event;
   const { deserializeJsMessageData, serializeJsMessageData } =
     window.__bootstrap.messagePort;
@@ -156,7 +158,7 @@ delete Intl.v8BreakIterator;
       const message = v[0];
       const transferables = v[1];
 
-      const msgEvent = new MessageEvent("message", {
+      const msgEvent = new event.MessageEvent("message", {
         cancelable: false,
         data: message,
         ports: transferables.filter((t) =>
@@ -167,7 +169,7 @@ delete Intl.v8BreakIterator;
       try {
         globalDispatchEvent(msgEvent);
       } catch (e) {
-        const errorEvent = new ErrorEvent("error", {
+        const errorEvent = new event.ErrorEvent("error", {
           cancelable: true,
           message: e.message,
           lineno: e.lineNumber ? e.lineNumber + 1 : undefined,
@@ -432,33 +434,35 @@ delete Intl.v8BreakIterator;
 
   // https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope
   const windowOrWorkerGlobalScope = {
+    AbortController: util.nonEnumerable(abortSignal.AbortController),
+    AbortSignal: util.nonEnumerable(abortSignal.AbortSignal),
     Blob: util.nonEnumerable(file.Blob),
     ByteLengthQueuingStrategy: util.nonEnumerable(
       streams.ByteLengthQueuingStrategy,
     ),
-    CloseEvent: util.nonEnumerable(CloseEvent),
+    CloseEvent: util.nonEnumerable(event.CloseEvent),
     CompressionStream: util.nonEnumerable(compression.CompressionStream),
     CountQueuingStrategy: util.nonEnumerable(
       streams.CountQueuingStrategy,
     ),
     CryptoKey: util.nonEnumerable(crypto.CryptoKey),
-    CustomEvent: util.nonEnumerable(CustomEvent),
+    CustomEvent: util.nonEnumerable(event.CustomEvent),
     DecompressionStream: util.nonEnumerable(compression.DecompressionStream),
     DOMException: util.nonEnumerable(domException.DOMException),
-    ErrorEvent: util.nonEnumerable(ErrorEvent),
-    Event: util.nonEnumerable(Event),
-    EventTarget: util.nonEnumerable(EventTarget),
+    ErrorEvent: util.nonEnumerable(event.ErrorEvent),
+    Event: util.nonEnumerable(event.Event),
+    EventTarget: util.nonEnumerable(eventTarget.EventTarget),
     File: util.nonEnumerable(file.File),
     FileReader: util.nonEnumerable(fileReader.FileReader),
     FormData: util.nonEnumerable(formData.FormData),
     Headers: util.nonEnumerable(headers.Headers),
-    MessageEvent: util.nonEnumerable(MessageEvent),
+    MessageEvent: util.nonEnumerable(event.MessageEvent),
     Performance: util.nonEnumerable(performance.Performance),
     PerformanceEntry: util.nonEnumerable(performance.PerformanceEntry),
     PerformanceMark: util.nonEnumerable(performance.PerformanceMark),
     PerformanceMeasure: util.nonEnumerable(performance.PerformanceMeasure),
-    PromiseRejectionEvent: util.nonEnumerable(PromiseRejectionEvent),
-    ProgressEvent: util.nonEnumerable(ProgressEvent),
+    PromiseRejectionEvent: util.nonEnumerable(event.PromiseRejectionEvent),
+    ProgressEvent: util.nonEnumerable(event.ProgressEvent),
     ReadableStream: util.nonEnumerable(streams.ReadableStream),
     ReadableStreamDefaultReader: util.nonEnumerable(
       streams.ReadableStreamDefaultReader,
@@ -518,9 +522,12 @@ delete Intl.v8BreakIterator;
     SubtleCrypto: util.nonEnumerable(crypto.SubtleCrypto),
     fetch: util.writable(fetch.fetch),
     performance: util.writable(performance.performance),
+    reportError: util.writable(event.reportError),
     setInterval: util.writable(timers.setInterval),
     setTimeout: util.writable(timers.setTimeout),
     structuredClone: util.writable(messagePort.structuredClone),
+    // Branding as a WebIDL object
+    [webidl.brand]: util.nonEnumerable(webidl.brand),
   };
 
   const unstableWindowOrWorkerGlobalScope = {
@@ -648,11 +655,14 @@ delete Intl.v8BreakIterator;
         continue;
       }
 
-      const event = new PromiseRejectionEvent("unhandledrejection", {
-        cancelable: true,
-        promise,
-        reason,
-      });
+      const rejectionEvent = new event.PromiseRejectionEvent(
+        "unhandledrejection",
+        {
+          cancelable: true,
+          promise,
+          reason,
+        },
+      );
 
       const errorEventCb = (event) => {
         if (event.error === reason) {
@@ -663,12 +673,12 @@ delete Intl.v8BreakIterator;
       // if error is thrown during dispatch of "unhandledrejection"
       // event.
       globalThis.addEventListener("error", errorEventCb);
-      globalThis.dispatchEvent(event);
+      globalThis.dispatchEvent(rejectionEvent);
       globalThis.removeEventListener("error", errorEventCb);
 
       // If event was not prevented (or "unhandledrejection" listeners didn't
       // throw) we will let Rust side handle it.
-      if (event.defaultPrevented) {
+      if (rejectionEvent.defaultPrevented) {
         ops.op_remove_pending_promise_exception(promise);
       }
     }

tools/wpt/expectation.json

@@ -1132,9 +1132,7 @@
       "Event interface: calling initEvent(DOMString, optional boolean, optional boolean) on new CustomEvent(\"foo\") with too few arguments must throw TypeError",
       "EventTarget interface: operation addEventListener(DOMString, EventListener?, optional (AddEventListenerOptions or boolean))",
       "EventTarget interface: operation removeEventListener(DOMString, EventListener?, optional (EventListenerOptions or boolean))",
-      "AbortController interface: existence and properties of interface object",
       "AbortController interface: operation abort(optional any)",
-      "AbortSignal interface: existence and properties of interface object",
       "AbortSignal interface: operation abort(optional any)",
       "AbortSignal interface: operation timeout(unsigned long long)",
       "AbortSignal interface: attribute onabort"