diff --git a/src/core/chunked_stream.js b/src/core/chunked_stream.js
index fae201f9c..19c7f1b77 100644
--- a/src/core/chunked_stream.js
+++ b/src/core/chunked_stream.js
@@ -14,7 +14,7 @@
  */
 
 import { arrayBuffersToBytes, MissingDataException } from "./core_utils.js";
-import { assert, createPromiseCapability } from "../shared/util.js";
+import { assert, PromiseCapability } from "../shared/util.js";
 import { Stream } from "./stream.js";
 
 class ChunkedStream extends Stream {
@@ -275,7 +275,7 @@ class ChunkedStreamManager {
     this.progressiveDataLength = 0;
     this.aborted = false;
 
-    this._loadedStreamCapability = createPromiseCapability();
+    this._loadedStreamCapability = new PromiseCapability();
   }
 
   sendRequest(begin, end) {
@@ -349,7 +349,7 @@ class ChunkedStreamManager {
       return Promise.resolve();
     }
 
-    const capability = createPromiseCapability();
+    const capability = new PromiseCapability();
     this._promisesByRequest.set(requestId, capability);
 
     const chunksToRequest = [];
diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 587901a73..d0248e8ee 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -18,7 +18,6 @@ import {
   AbortException,
   assert,
   CMapCompressionType,
-  createPromiseCapability,
   FONT_IDENTITY_MATRIX,
   FormatError,
   IDENTITY_MATRIX,
@@ -26,6 +25,7 @@ import {
   isArrayEqual,
   normalizeUnicode,
   OPS,
+  PromiseCapability,
   shadow,
   stringToPDFString,
   TextRenderingMode,
@@ -1253,7 +1253,7 @@ class PartialEvaluator {
       return this.fontCache.get(font.cacheKey);
     }
 
-    const fontCapability = createPromiseCapability();
+    const fontCapability = new PromiseCapability();
 
     let preEvaluatedFont;
     try {
diff --git a/src/core/worker.js b/src/core/worker.js
index 597cb619f..7c76578b9 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -16,12 +16,12 @@
 import {
   AbortException,
   assert,
-  createPromiseCapability,
   getVerbosityLevel,
   info,
   InvalidPDFException,
   MissingPDFException,
   PasswordException,
+  PromiseCapability,
   setVerbosityLevel,
   stringToPDFString,
   UnexpectedResponseException,
@@ -46,7 +46,7 @@ class WorkerTask {
   constructor(name) {
     this.name = name;
     this.terminated = false;
-    this._capability = createPromiseCapability();
+    this._capability = new PromiseCapability();
   }
 
   get finished() {
@@ -228,7 +228,7 @@ class WorkerMessageHandler {
         password,
         rangeChunkSize,
       };
-      const pdfManagerCapability = createPromiseCapability();
+      const pdfManagerCapability = new PromiseCapability();
       let newPdfManager;
 
       if (data) {
diff --git a/src/display/api.js b/src/display/api.js
index 33f4f8be9..4edd7bf0e 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -21,7 +21,6 @@ import {
   AbortException,
   AnnotationMode,
   assert,
-  createPromiseCapability,
   getVerbosityLevel,
   info,
   InvalidPDFException,
@@ -29,6 +28,7 @@ import {
   MAX_IMAGE_SIZE_TO_CACHE,
   MissingPDFException,
   PasswordException,
+  PromiseCapability,
   RenderingIntentFlag,
   setVerbosityLevel,
   shadow,
@@ -588,7 +588,7 @@ class PDFDocumentLoadingTask {
   static #docId = 0;
 
   constructor() {
-    this._capability = createPromiseCapability();
+    this._capability = new PromiseCapability();
     this._transport = null;
     this._worker = null;
 
@@ -675,7 +675,7 @@ class PDFDataRangeTransport {
     this._progressListeners = [];
     this._progressiveReadListeners = [];
     this._progressiveDoneListeners = [];
-    this._readyCapability = createPromiseCapability();
+    this._readyCapability = new PromiseCapability();
   }
 
   /**
@@ -1460,7 +1460,7 @@ class PDFPageProxy {
     // If there's no displayReadyCapability yet, then the operatorList
     // was never requested before. Make the request and create the promise.
     if (!intentState.displayReadyCapability) {
-      intentState.displayReadyCapability = createPromiseCapability();
+      intentState.displayReadyCapability = new PromiseCapability();
       intentState.operatorList = {
         fnArray: [],
         argsArray: [],
@@ -1578,7 +1578,7 @@ class PDFPageProxy {
     if (!intentState.opListReadCapability) {
       opListTask = Object.create(null);
       opListTask.operatorListChanged = operatorListChanged;
-      intentState.opListReadCapability = createPromiseCapability();
+      intentState.opListReadCapability = new PromiseCapability();
       (intentState.renderTasks ||= new Set()).add(opListTask);
       intentState.operatorList = {
         fnArray: [],
@@ -2054,7 +2054,7 @@ class PDFWorker {
     this.destroyed = false;
     this.verbosity = verbosity;
 
-    this._readyCapability = createPromiseCapability();
+    this._readyCapability = new PromiseCapability();
     this._port = null;
     this._webWorker = null;
     this._messageHandler = null;
@@ -2388,7 +2388,7 @@ class WorkerTransport {
     this._networkStream = networkStream;
     this._fullReader = null;
     this._lastProgress = null;
-    this.downloadInfoCapability = createPromiseCapability();
+    this.downloadInfoCapability = new PromiseCapability();
 
     this.setupMessageHandler();
 
@@ -2487,7 +2487,7 @@ class WorkerTransport {
     }
 
     this.destroyed = true;
-    this.destroyCapability = createPromiseCapability();
+    this.destroyCapability = new PromiseCapability();
 
     if (this._passwordCapability) {
       this._passwordCapability.reject(
@@ -2581,7 +2581,7 @@ class WorkerTransport {
     });
 
     messageHandler.on("ReaderHeadersReady", data => {
-      const headersCapability = createPromiseCapability();
+      const headersCapability = new PromiseCapability();
       const fullReader = this._fullReader;
       fullReader.headersReady.then(() => {
         // If stream or range are disabled, it's our only way to report
@@ -2696,7 +2696,7 @@ class WorkerTransport {
     });
 
     messageHandler.on("PasswordRequest", exception => {
-      this._passwordCapability = createPromiseCapability();
+      this._passwordCapability = new PromiseCapability();
 
       if (loadingTask.onPassword) {
         const updatePassword = password => {
@@ -3117,7 +3117,7 @@ class PDFObjects {
       return obj;
     }
     return (this.#objs[objId] = {
-      capability: createPromiseCapability(),
+      capability: new PromiseCapability(),
       data: null,
     });
   }
@@ -3277,7 +3277,7 @@ class InternalRenderTask {
     this._useRequestAnimationFrame =
       useRequestAnimationFrame === true && typeof window !== "undefined";
     this.cancelled = false;
-    this.capability = createPromiseCapability();
+    this.capability = new PromiseCapability();
     this.task = new RenderTask(this);
     // caching this-bound methods
     this._cancelBound = this.cancel.bind(this);
diff --git a/src/display/fetch_stream.js b/src/display/fetch_stream.js
index 6680b067f..d68b1d77f 100644
--- a/src/display/fetch_stream.js
+++ b/src/display/fetch_stream.js
@@ -16,7 +16,7 @@
 import {
   AbortException,
   assert,
-  createPromiseCapability,
+  PromiseCapability,
   warn,
 } from "../shared/util.js";
 import {
@@ -118,7 +118,7 @@ class PDFFetchStreamReader {
     const source = stream.source;
     this._withCredentials = source.withCredentials || false;
     this._contentLength = source.length;
-    this._headersCapability = createPromiseCapability();
+    this._headersCapability = new PromiseCapability();
     this._disableRange = source.disableRange || false;
     this._rangeChunkSize = source.rangeChunkSize;
     if (!this._rangeChunkSize && !this._disableRange) {
@@ -224,7 +224,7 @@ class PDFFetchStreamRangeReader {
     this._loaded = 0;
     const source = stream.source;
     this._withCredentials = source.withCredentials || false;
-    this._readCapability = createPromiseCapability();
+    this._readCapability = new PromiseCapability();
     this._isStreamingSupported = !source.disableStream;
 
     this._abortController = new AbortController();
diff --git a/src/display/network.js b/src/display/network.js
index 9b44a979f..998e58809 100644
--- a/src/display/network.js
+++ b/src/display/network.js
@@ -13,11 +13,7 @@
  * limitations under the License.
  */
 
-import {
-  assert,
-  createPromiseCapability,
-  stringToBytes,
-} from "../shared/util.js";
+import { assert, PromiseCapability, stringToBytes } from "../shared/util.js";
 import {
   createResponseStatusError,
   extractFilenameFromHeader,
@@ -259,7 +255,7 @@ class PDFNetworkStreamFullRequestReader {
     };
     this._url = source.url;
     this._fullRequestId = manager.requestFull(args);
-    this._headersReceivedCapability = createPromiseCapability();
+    this._headersReceivedCapability = new PromiseCapability();
     this._disableRange = source.disableRange || false;
     this._contentLength = source.length; // Optional
     this._rangeChunkSize = source.rangeChunkSize;
@@ -380,7 +376,7 @@ class PDFNetworkStreamFullRequestReader {
     if (this._done) {
       return { value: undefined, done: true };
     }
-    const requestCapability = createPromiseCapability();
+    const requestCapability = new PromiseCapability();
     this._requests.push(requestCapability);
     return requestCapability.promise;
   }
@@ -471,7 +467,7 @@ class PDFNetworkStreamRangeRequestReader {
     if (this._done) {
       return { value: undefined, done: true };
     }
-    const requestCapability = createPromiseCapability();
+    const requestCapability = new PromiseCapability();
     this._requests.push(requestCapability);
     return requestCapability.promise;
   }
diff --git a/src/display/node_stream.js b/src/display/node_stream.js
index 238881b0e..e63c3c778 100644
--- a/src/display/node_stream.js
+++ b/src/display/node_stream.js
@@ -17,8 +17,8 @@
 import {
   AbortException,
   assert,
-  createPromiseCapability,
   MissingPDFException,
+  PromiseCapability,
 } from "../shared/util.js";
 import {
   extractFilenameFromHeader,
@@ -124,8 +124,8 @@ class BaseFullReader {
     this._isRangeSupported = !source.disableRange;
 
     this._readableStream = null;
-    this._readCapability = createPromiseCapability();
-    this._headersCapability = createPromiseCapability();
+    this._readCapability = new PromiseCapability();
+    this._headersCapability = new PromiseCapability();
   }
 
   get headersReady() {
@@ -159,7 +159,7 @@ class BaseFullReader {
 
     const chunk = this._readableStream.read();
     if (chunk === null) {
-      this._readCapability = createPromiseCapability();
+      this._readCapability = new PromiseCapability();
       return this.read();
     }
     this._loaded += chunk.length;
@@ -226,7 +226,7 @@ class BaseRangeReader {
     this.onProgress = null;
     this._loaded = 0;
     this._readableStream = null;
-    this._readCapability = createPromiseCapability();
+    this._readCapability = new PromiseCapability();
     const source = stream.source;
     this._isStreamingSupported = !source.disableStream;
   }
@@ -246,7 +246,7 @@ class BaseRangeReader {
 
     const chunk = this._readableStream.read();
     if (chunk === null) {
-      this._readCapability = createPromiseCapability();
+      this._readCapability = new PromiseCapability();
       return this.read();
     }
     this._loaded += chunk.length;
diff --git a/src/display/text_layer.js b/src/display/text_layer.js
index 7dbc3d915..d7682e519 100644
--- a/src/display/text_layer.js
+++ b/src/display/text_layer.js
@@ -18,8 +18,8 @@
 
 import {
   AbortException,
-  createPromiseCapability,
   FeatureTest,
+  PromiseCapability,
   Util,
 } from "../shared/util.js";
 import { deprecated, setLayerDimensions } from "./display_utils.js";
@@ -317,7 +317,7 @@ class TextLayerRenderTask {
     this._reader = null;
     this._textDivProperties = textDivProperties || new WeakMap();
     this._canceled = false;
-    this._capability = createPromiseCapability();
+    this._capability = new PromiseCapability();
     this._layoutTextParams = {
       prevFontSize: null,
       prevFontFamily: null,
@@ -417,7 +417,7 @@ class TextLayerRenderTask {
    * @private
    */
   _render() {
-    const capability = createPromiseCapability();
+    const capability = new PromiseCapability();
     let styleCache = Object.create(null);
 
     if (this._isReadableStream) {
diff --git a/src/display/transport_stream.js b/src/display/transport_stream.js
index b27dbaf7d..9a634c3af 100644
--- a/src/display/transport_stream.js
+++ b/src/display/transport_stream.js
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { assert, createPromiseCapability } from "../shared/util.js";
+import { assert, PromiseCapability } from "../shared/util.js";
 import { isPdfFile } from "./display_utils.js";
 
 /** @implements {IPDFStream} */
@@ -235,7 +235,7 @@ class PDFDataTransportStreamReader {
     if (this._done) {
       return { value: undefined, done: true };
     }
-    const requestCapability = createPromiseCapability();
+    const requestCapability = new PromiseCapability();
     this._requests.push(requestCapability);
     return requestCapability.promise;
   }
@@ -300,7 +300,7 @@ class PDFDataTransportStreamRangeReader {
     if (this._done) {
       return { value: undefined, done: true };
     }
-    const requestCapability = createPromiseCapability();
+    const requestCapability = new PromiseCapability();
     this._requests.push(requestCapability);
     return requestCapability.promise;
   }
diff --git a/src/pdf.js b/src/pdf.js
index e2162ee11..36c5615da 100644
--- a/src/pdf.js
+++ b/src/pdf.js
@@ -30,7 +30,6 @@ import {
   AnnotationEditorType,
   AnnotationMode,
   CMapCompressionType,
-  createPromiseCapability,
   createValidAbsoluteUrl,
   FeatureTest,
   InvalidPDFException,
@@ -39,6 +38,7 @@ import {
   OPS,
   PasswordResponses,
   PermissionFlag,
+  PromiseCapability,
   shadow,
   UnexpectedResponseException,
   Util,
@@ -88,7 +88,6 @@ export {
   AnnotationMode,
   build,
   CMapCompressionType,
-  createPromiseCapability,
   createValidAbsoluteUrl,
   FeatureTest,
   getDocument,
@@ -109,6 +108,7 @@ export {
   PDFWorker,
   PermissionFlag,
   PixelsPerInch,
+  PromiseCapability,
   RenderingCancelledException,
   renderTextLayer,
   setLayerDimensions,
diff --git a/src/shared/message_handler.js b/src/shared/message_handler.js
index 894332ac6..8770d2889 100644
--- a/src/shared/message_handler.js
+++ b/src/shared/message_handler.js
@@ -16,9 +16,9 @@
 import {
   AbortException,
   assert,
-  createPromiseCapability,
   MissingPDFException,
   PasswordException,
+  PromiseCapability,
   UnexpectedResponseException,
   UnknownErrorException,
   unreachable,
@@ -190,7 +190,7 @@ class MessageHandler {
    */
   sendWithPromise(actionName, data, transfers) {
     const callbackId = this.callbackId++;
-    const capability = createPromiseCapability();
+    const capability = new PromiseCapability();
     this.callbackCapabilities[callbackId] = capability;
     try {
       this.comObj.postMessage(
@@ -228,7 +228,7 @@ class MessageHandler {
     return new ReadableStream(
       {
         start: controller => {
-          const startCapability = createPromiseCapability();
+          const startCapability = new PromiseCapability();
           this.streamControllers[streamId] = {
             controller,
             startCall: startCapability,
@@ -252,7 +252,7 @@ class MessageHandler {
         },
 
         pull: controller => {
-          const pullCapability = createPromiseCapability();
+          const pullCapability = new PromiseCapability();
           this.streamControllers[streamId].pullCall = pullCapability;
           comObj.postMessage({
             sourceName,
@@ -268,7 +268,7 @@ class MessageHandler {
 
         cancel: reason => {
           assert(reason instanceof Error, "cancel must have a valid reason");
-          const cancelCapability = createPromiseCapability();
+          const cancelCapability = new PromiseCapability();
           this.streamControllers[streamId].cancelCall = cancelCapability;
           this.streamControllers[streamId].isClosed = true;
           comObj.postMessage({
@@ -305,7 +305,7 @@ class MessageHandler {
         // so when it changes from positive to negative,
         // set ready as unresolved promise.
         if (lastDesiredSize > 0 && this.desiredSize <= 0) {
-          this.sinkCapability = createPromiseCapability();
+          this.sinkCapability = new PromiseCapability();
           this.ready = this.sinkCapability.promise;
         }
         comObj.postMessage(
@@ -349,7 +349,7 @@ class MessageHandler {
         });
       },
 
-      sinkCapability: createPromiseCapability(),
+      sinkCapability: new PromiseCapability(),
       onPull: null,
       onCancel: null,
       isCancelled: false,
diff --git a/src/shared/util.js b/src/shared/util.js
index ede1ee62c..b6cafbdca 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -975,42 +975,41 @@ function getModificationDate(date = new Date()) {
   return buffer.join("");
 }
 
-/**
- * Promise Capability object.
- *
- * @typedef {Object} PromiseCapability
- * @property {Promise<any>} promise - A Promise object.
- * @property {boolean} settled - If the Promise has been fulfilled/rejected.
- * @property {function} resolve - Fulfills the Promise.
- * @property {function} reject - Rejects the Promise.
- */
+class PromiseCapability {
+  #settled = false;
 
-/**
- * Creates a promise capability object.
- * @alias createPromiseCapability
- *
- * @returns {PromiseCapability}
- */
-function createPromiseCapability() {
-  const capability = Object.create(null);
-  let isSettled = false;
+  constructor() {
+    /**
+     * @type {Promise<any>} The Promise object.
+     */
+    this.promise = new Promise((resolve, reject) => {
+      /**
+       * @type {function} Fulfills the Promise.
+       */
+      this.resolve = data => {
+        this.#settled = true;
+        resolve(data);
+      };
 
-  Object.defineProperty(capability, "settled", {
-    get() {
-      return isSettled;
-    },
-  });
-  capability.promise = new Promise(function (resolve, reject) {
-    capability.resolve = function (data) {
-      isSettled = true;
-      resolve(data);
-    };
-    capability.reject = function (reason) {
-      isSettled = true;
-      reject(reason);
-    };
-  });
-  return capability;
+      /**
+       * @type {function} Rejects the Promise.
+       */
+      this.reject = reason => {
+        if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
+          assert(reason instanceof Error, 'Expected valid "reason" argument.');
+        }
+        this.#settled = true;
+        reject(reason);
+      };
+    });
+  }
+
+  /**
+   * @type {boolean} If the Promise has been fulfilled/rejected.
+   */
+  get settled() {
+    return this.#settled;
+  }
 }
 
 let NormalizeRegex = null;
@@ -1052,7 +1051,6 @@ export {
   BASELINE_FACTOR,
   bytesToString,
   CMapCompressionType,
-  createPromiseCapability,
   createValidAbsoluteUrl,
   DocumentActionEventType,
   FeatureTest,
@@ -1078,6 +1076,7 @@ export {
   PasswordException,
   PasswordResponses,
   PermissionFlag,
+  PromiseCapability,
   RenderingIntentFlag,
   setVerbosityLevel,
   shadow,
diff --git a/test/driver.js b/test/driver.js
index 124bdf1e9..3d88918b7 100644
--- a/test/driver.js
+++ b/test/driver.js
@@ -17,10 +17,10 @@
 const {
   AnnotationLayer,
   AnnotationMode,
-  createPromiseCapability,
   getDocument,
   GlobalWorkerOptions,
   PixelsPerInch,
+  PromiseCapability,
   renderTextLayer,
   shadow,
   XfaLayer,
@@ -922,7 +922,7 @@ class Driver {
   }
 
   _send(url, message) {
-    const capability = createPromiseCapability();
+    const capability = new PromiseCapability();
     this.inflight.textContent = this.inFlightRequests++;
 
     fetch(url, {
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index 2ab1a8ebc..319012fbe 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -17,7 +17,6 @@ import {
   AnnotationEditorType,
   AnnotationMode,
   AnnotationType,
-  createPromiseCapability,
   ImageKind,
   InvalidPDFException,
   MissingPDFException,
@@ -26,6 +25,7 @@ import {
   PasswordException,
   PasswordResponses,
   PermissionFlag,
+  PromiseCapability,
   UnknownErrorException,
 } from "../../src/shared/util.js";
 import {
@@ -137,7 +137,7 @@ describe("api", function () {
       const loadingTask = getDocument(basicApiGetDocumentParams);
       expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
 
-      const progressReportedCapability = createPromiseCapability();
+      const progressReportedCapability = new PromiseCapability();
       // Attach the callback that is used to report loading progress;
       // similarly to how viewer.js works.
       loadingTask.onProgress = function (progressData) {
@@ -199,7 +199,7 @@ describe("api", function () {
       const loadingTask = getDocument(typedArrayPdf);
       expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
 
-      const progressReportedCapability = createPromiseCapability();
+      const progressReportedCapability = new PromiseCapability();
       loadingTask.onProgress = function (data) {
         progressReportedCapability.resolve(data);
       };
@@ -229,7 +229,7 @@ describe("api", function () {
       const loadingTask = getDocument(arrayBufferPdf);
       expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
 
-      const progressReportedCapability = createPromiseCapability();
+      const progressReportedCapability = new PromiseCapability();
       loadingTask.onProgress = function (data) {
         progressReportedCapability.resolve(data);
       };
@@ -291,8 +291,8 @@ describe("api", function () {
       const loadingTask = getDocument(buildGetDocumentParams("pr6531_1.pdf"));
       expect(loadingTask instanceof PDFDocumentLoadingTask).toEqual(true);
 
-      const passwordNeededCapability = createPromiseCapability();
-      const passwordIncorrectCapability = createPromiseCapability();
+      const passwordNeededCapability = new PromiseCapability();
+      const passwordIncorrectCapability = new PromiseCapability();
       // Attach the callback that is used to request a password;
       // similarly to how the default viewer handles passwords.
       loadingTask.onPassword = function (updatePassword, reason) {
diff --git a/test/unit/message_handler_spec.js b/test/unit/message_handler_spec.js
index 25c06910b..09745a10d 100644
--- a/test/unit/message_handler_spec.js
+++ b/test/unit/message_handler_spec.js
@@ -15,7 +15,7 @@
 
 import {
   AbortException,
-  createPromiseCapability,
+  PromiseCapability,
   UnknownErrorException,
 } from "../../src/shared/util.js";
 import { LoopbackPort } from "../../src/display/api.js";
@@ -338,7 +338,7 @@ describe("message_handler", function () {
     it("should ignore any pull after close is called", async function () {
       let log = "";
       const port = new LoopbackPort();
-      const capability = createPromiseCapability();
+      const capability = new PromiseCapability();
       const messageHandler2 = new MessageHandler("worker", "main", port);
       messageHandler2.on("fakeHandler", (data, sink) => {
         sink.onPull = function () {
diff --git a/test/unit/util_spec.js b/test/unit/util_spec.js
index 43ee82883..ed6936e1a 100644
--- a/test/unit/util_spec.js
+++ b/test/unit/util_spec.js
@@ -15,10 +15,10 @@
 
 import {
   bytesToString,
-  createPromiseCapability,
   createValidAbsoluteUrl,
   getModificationDate,
   isArrayBuffer,
+  PromiseCapability,
   string32,
   stringToBytes,
   stringToPDFString,
@@ -212,9 +212,9 @@ describe("util", function () {
     });
   });
 
-  describe("createPromiseCapability", function () {
+  describe("PromiseCapability", function () {
     it("should resolve with correct data", async function () {
-      const promiseCapability = createPromiseCapability();
+      const promiseCapability = new PromiseCapability();
       expect(promiseCapability.settled).toEqual(false);
 
       promiseCapability.resolve({ test: "abc" });
@@ -225,7 +225,7 @@ describe("util", function () {
     });
 
     it("should reject with correct reason", async function () {
-      const promiseCapability = createPromiseCapability();
+      const promiseCapability = new PromiseCapability();
       expect(promiseCapability.settled).toEqual(false);
 
       promiseCapability.reject(new Error("reason"));
diff --git a/web/app.js b/web/app.js
index 6153a4e44..75a10cd61 100644
--- a/web/app.js
+++ b/web/app.js
@@ -36,7 +36,6 @@ import {
 import {
   AnnotationEditorType,
   build,
-  createPromiseCapability,
   FeatureTest,
   getDocument,
   getFilenameFromUrl,
@@ -49,6 +48,7 @@ import {
   MissingPDFException,
   OPS,
   PDFWorker,
+  PromiseCapability,
   shadow,
   UnexpectedResponseException,
   version,
@@ -156,7 +156,7 @@ class DefaultExternalServices {
 
 const PDFViewerApplication = {
   initialBookmark: document.location.hash.substring(1),
-  _initializedCapability: createPromiseCapability(),
+  _initializedCapability: new PromiseCapability(),
   appConfig: null,
   pdfDocument: null,
   pdfLoadingTask: null,
diff --git a/web/password_prompt.js b/web/password_prompt.js
index ba8ac4c9e..01251a1f8 100644
--- a/web/password_prompt.js
+++ b/web/password_prompt.js
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { createPromiseCapability, PasswordResponses } from "pdfjs-lib";
+import { PasswordResponses, PromiseCapability } from "pdfjs-lib";
 
 /**
  * @typedef {Object} PasswordPromptOptions
@@ -69,7 +69,7 @@ class PasswordPrompt {
     if (this.#activeCapability) {
       await this.#activeCapability.promise;
     }
-    this.#activeCapability = createPromiseCapability();
+    this.#activeCapability = new PromiseCapability();
 
     try {
       await this.overlayManager.open(this.dialog);
diff --git a/web/pdf_attachment_viewer.js b/web/pdf_attachment_viewer.js
index c138a34b3..be8588878 100644
--- a/web/pdf_attachment_viewer.js
+++ b/web/pdf_attachment_viewer.js
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { createPromiseCapability, getFilenameFromUrl } from "pdfjs-lib";
+import { getFilenameFromUrl, PromiseCapability } from "pdfjs-lib";
 import { BaseTreeViewer } from "./base_tree_viewer.js";
 import { waitOnEventOrTimeout } from "./event_utils.js";
 
@@ -50,7 +50,7 @@ class PDFAttachmentViewer extends BaseTreeViewer {
     if (!keepRenderedCapability) {
       // The only situation in which the `_renderedCapability` should *not* be
       // replaced is when appending FileAttachment annotations.
-      this._renderedCapability = createPromiseCapability();
+      this._renderedCapability = new PromiseCapability();
     }
     this._pendingDispatchEvent = false;
   }
diff --git a/web/pdf_document_properties.js b/web/pdf_document_properties.js
index 8761b08d6..b2799cda0 100644
--- a/web/pdf_document_properties.js
+++ b/web/pdf_document_properties.js
@@ -13,8 +13,8 @@
  * limitations under the License.
  */
 
-import { createPromiseCapability, PDFDateString } from "pdfjs-lib";
 import { getPageSizeInches, isPortraitOrientation } from "./ui_utils.js";
+import { PDFDateString, PromiseCapability } from "pdfjs-lib";
 
 const DEFAULT_FIELD_CONTENT = "-";
 
@@ -201,7 +201,7 @@ class PDFDocumentProperties {
     this.pdfDocument = null;
 
     this.#fieldData = null;
-    this._dataAvailableCapability = createPromiseCapability();
+    this._dataAvailableCapability = new PromiseCapability();
     this._currentPageNumber = 1;
     this._pagesRotation = 0;
   }
diff --git a/web/pdf_find_controller.js b/web/pdf_find_controller.js
index 5a725b85d..d070e9c91 100644
--- a/web/pdf_find_controller.js
+++ b/web/pdf_find_controller.js
@@ -19,7 +19,7 @@
 
 import { binarySearchFirstItem, scrollIntoView } from "./ui_utils.js";
 import { getCharacterType, getNormalizeWithNFKC } from "./pdf_find_utils.js";
-import { createPromiseCapability } from "pdfjs-lib";
+import { PromiseCapability } from "pdfjs-lib";
 
 const FindState = {
   FOUND: 0,
@@ -582,7 +582,7 @@ class PDFFindController {
     clearTimeout(this._findTimeout);
     this._findTimeout = null;
 
-    this._firstPageCapability = createPromiseCapability();
+    this._firstPageCapability = new PromiseCapability();
   }
 
   /**
@@ -849,7 +849,7 @@ class PDFFindController {
     let promise = Promise.resolve();
     const textOptions = { disableNormalization: true };
     for (let i = 0, ii = this._linkService.pagesCount; i < ii; i++) {
-      const extractTextCapability = createPromiseCapability();
+      const extractTextCapability = new PromiseCapability();
       this._extractTextPromises[i] = extractTextCapability.promise;
 
       promise = promise.then(() => {
diff --git a/web/pdf_outline_viewer.js b/web/pdf_outline_viewer.js
index 42ac42c6c..31d0e125a 100644
--- a/web/pdf_outline_viewer.js
+++ b/web/pdf_outline_viewer.js
@@ -14,7 +14,7 @@
  */
 
 import { BaseTreeViewer } from "./base_tree_viewer.js";
-import { createPromiseCapability } from "pdfjs-lib";
+import { PromiseCapability } from "pdfjs-lib";
 import { SidebarView } from "./ui_utils.js";
 
 /**
@@ -89,7 +89,7 @@ class PDFOutlineViewer extends BaseTreeViewer {
    * @private
    */
   _dispatchEvent(outlineCount) {
-    this._currentOutlineItemCapability = createPromiseCapability();
+    this._currentOutlineItemCapability = new PromiseCapability();
     if (
       outlineCount === 0 ||
       this._pdfDocument?.loadingParams.disableAutoFetch
@@ -308,7 +308,7 @@ class PDFOutlineViewer extends BaseTreeViewer {
     if (this._pageNumberToDestHashCapability) {
       return this._pageNumberToDestHashCapability.promise;
     }
-    this._pageNumberToDestHashCapability = createPromiseCapability();
+    this._pageNumberToDestHashCapability = new PromiseCapability();
 
     const pageNumberToDestHash = new Map(),
       pageNumberNesting = new Map();
diff --git a/web/pdf_scripting_manager.js b/web/pdf_scripting_manager.js
index cac4cc68e..befbdeb9b 100644
--- a/web/pdf_scripting_manager.js
+++ b/web/pdf_scripting_manager.js
@@ -16,7 +16,7 @@
 /** @typedef {import("./event_utils").EventBus} EventBus */
 
 import { apiPageLayoutToViewerModes, RenderingStates } from "./ui_utils.js";
-import { createPromiseCapability, shadow } from "pdfjs-lib";
+import { PromiseCapability, shadow } from "pdfjs-lib";
 
 /**
  * @typedef {Object} PDFScriptingManagerOptions
@@ -357,7 +357,7 @@ class PDFScriptingManager {
       visitedPages = this._visitedPages;
 
     if (initialize) {
-      this._closeCapability = createPromiseCapability();
+      this._closeCapability = new PromiseCapability();
     }
     if (!this._closeCapability) {
       return; // Scripting isn't fully initialized yet.
@@ -443,7 +443,7 @@ class PDFScriptingManager {
    * @private
    */
   _createScripting() {
-    this._destroyCapability = createPromiseCapability();
+    this._destroyCapability = new PromiseCapability();
 
     if (this._scripting) {
       throw new Error("_createScripting: Scripting already exists.");
diff --git a/web/pdf_viewer.js b/web/pdf_viewer.js
index b8ce37400..0f3272415 100644
--- a/web/pdf_viewer.js
+++ b/web/pdf_viewer.js
@@ -28,9 +28,9 @@ import {
   AnnotationEditorType,
   AnnotationEditorUIManager,
   AnnotationMode,
-  createPromiseCapability,
   PermissionFlag,
   PixelsPerInch,
+  PromiseCapability,
   version,
 } from "pdfjs-lib";
 import {
@@ -1025,9 +1025,9 @@ class PDFViewer {
     this._location = null;
     this._pagesRotation = 0;
     this._optionalContentConfigPromise = null;
-    this._firstPageCapability = createPromiseCapability();
-    this._onePageRenderedCapability = createPromiseCapability();
-    this._pagesCapability = createPromiseCapability();
+    this._firstPageCapability = new PromiseCapability();
+    this._onePageRenderedCapability = new PromiseCapability();
+    this._pagesCapability = new PromiseCapability();
     this._scrollMode = ScrollMode.VERTICAL;
     this._previousScrollMode = ScrollMode.UNKNOWN;
     this._spreadMode = SpreadMode.NONE;