diff --git a/src/@types/global.d.ts b/src/@types/global.d.ts
index 71c0c87b815..d7e7c76ac2d 100644
--- a/src/@types/global.d.ts
+++ b/src/@types/global.d.ts
@@ -29,20 +29,11 @@ declare global {
 
     namespace NodeJS {
         interface Global {
-            localStorage: Storage;
             // marker variable used to detect both the browser & node entrypoints being used at once
             __js_sdk_entrypoint: unknown;
         }
     }
 
-    interface Window {
-        webkitAudioContext: typeof AudioContext;
-    }
-
-    interface Crypto {
-        webkitSubtle?: Window["crypto"]["subtle"];
-    }
-
     interface MediaDevices {
         // This is experimental and types don't know about it yet
         // https://github.com/microsoft/TypeScript/issues/33232
@@ -76,40 +67,4 @@ declare global {
         // on webkit: we should check if we still need to do this
         webkitGetUserMedia: DummyInterfaceWeShouldntBeUsingThis;
     }
-
-    export interface ISettledFulfilled<T> {
-        status: "fulfilled";
-        value: T;
-    }
-    export interface ISettledRejected {
-        status: "rejected";
-        reason: any;
-    }
-
-    interface PromiseConstructor {
-        allSettled<T>(promises: Promise<T>[]): Promise<Array<ISettledFulfilled<T> | ISettledRejected>>;
-    }
-
-    interface RTCRtpTransceiver {
-        // This has been removed from TS
-        // (https://github.com/microsoft/TypeScript-DOM-lib-generator/issues/1029),
-        // but we still need this for MatrixCall::getRidOfRTXCodecs()
-        setCodecPreferences(codecs: RTCRtpCodecCapability[]): void;
-    }
-
-    interface RequestInit {
-        /**
-         * Specifies the priority of the fetch request relative to other requests of the same type.
-         * Must be one of the following strings:
-         *   high: A high priority fetch request relative to other requests of the same type.
-         *   low: A low priority fetch request relative to other requests of the same type.
-         *   auto: Automatically determine the priority of the fetch request relative to other requests of the same type (default).
-         *
-         * @see https://html.spec.whatwg.org/multipage/urls-and-fetching.html#fetch-priority-attribute
-         * @see https://github.com/microsoft/TypeScript/issues/54472
-         * @see https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API#browser_compatibility
-         * Not yet supported in Safari or Firefox
-         */
-        priority?: "high" | "low" | "auto";
-    }
 }
diff --git a/src/crypto/algorithms/base.ts b/src/crypto/algorithms/base.ts
index 37dae34bd77..2dda6e91efa 100644
--- a/src/crypto/algorithms/base.ts
+++ b/src/crypto/algorithms/base.ts
@@ -66,7 +66,6 @@ export abstract class EncryptionAlgorithm {
     protected readonly crypto: Crypto;
     protected readonly olmDevice: OlmDevice;
     protected readonly baseApis: MatrixClient;
-    protected readonly roomId?: string;
 
     /**
      * @param params - parameters
@@ -77,7 +76,6 @@ export abstract class EncryptionAlgorithm {
         this.crypto = params.crypto;
         this.olmDevice = params.olmDevice;
         this.baseApis = params.baseApis;
-        this.roomId = params.roomId;
     }
 
     /**
@@ -127,14 +125,12 @@ export abstract class DecryptionAlgorithm {
     protected readonly crypto: Crypto;
     protected readonly olmDevice: OlmDevice;
     protected readonly baseApis: MatrixClient;
-    protected readonly roomId?: string;
 
     public constructor(params: DecryptionClassParams) {
         this.userId = params.userId;
         this.crypto = params.crypto;
         this.olmDevice = params.olmDevice;
         this.baseApis = params.baseApis;
-        this.roomId = params.roomId;
     }
 
     /**