Use deferred

src/matrix/verification/SAS/channel/Channel.ts

@@ -23,6 +23,7 @@ import {makeTxnId} from "../../../common.js";
 import {CancelReason, VerificationEventTypes} from "./types";
 import {Disposables} from "../../../../utils/Disposables";
 import {VerificationCancelledError} from "../VerificationCancelledError";
+import {Deferred} from "../../../../utils/Deferred";
 
 const messageFromErrorType = {
     [CancelReason.UserCancelled]: "User declined",
@@ -71,7 +72,7 @@ export class ToDeviceChannel extends Disposables implements IChannel {
     private readonly deviceMessageHandler: DeviceMessageHandler;
     private readonly sentMessages: Map<VerificationEventTypes, any> = new Map();
     private readonly receivedMessages: Map<VerificationEventTypes, any> = new Map();
-    private readonly waitMap: Map<string, {resolve: any, reject: any, promise: Promise<any>}> = new Map();
+    private readonly waitMap: Map<string, Deferred<any>> = new Map();
     private readonly log: ILogItem;
     public otherUserDeviceId: string;
     public startMessage: any;
@@ -270,14 +271,9 @@ export class ToDeviceChannel extends Disposables implements IChannel {
         if (existingWait) {
             return existingWait.promise;
         }
-        let resolve, reject;
-        // Add to wait map
-        const promise = new Promise((_resolve, _reject) => {
-            resolve = _resolve;
-            reject = _reject;
-        });
-        this.waitMap.set(eventType, { resolve, reject, promise });
-        return promise;
+        const deferred = new Deferred(); 
+        this.waitMap.set(eventType, deferred);
+        return deferred.promise;
     }
 
     setStartMessage(event) {

src/utils/Deferred.ts

@@ -0,0 +1,40 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export class Deferred<T> {
+    public readonly promise: Promise<T>;
+    public readonly resolve: (value: T) => void;
+    public readonly reject: (err: Error) => void;
+    private _value?: T;
+
+    constructor() {
+        let resolve;
+        let reject;
+        this.promise = new Promise<T>((_resolve, _reject) => {
+            resolve = _resolve;
+            reject = _reject;
+        })
+        this.resolve = (value: T) => {
+            this._value = value;
+            resolve(value);
+        };
+        this.reject = reject;
+    }
+
+    get value(): T | undefined {
+        return this._value;
+    }
+}