chore: align with libdatachannel

Author: achingbrain

src/lib/index.ts

@@ -8,7 +8,7 @@ export function preload(): void { nodeDataChannel.preload(); }
 export function initLogger(level: LogLevel): void { nodeDataChannel.initLogger(level); }
 export function cleanup(): void { nodeDataChannel.cleanup(); }
 export function setSctpSettings(settings: SctpSettings): void { nodeDataChannel.setSctpSettings(settings); }
-export function listenIceUdpMux(port: number, cb?: (req: { ufrag: string, host: string, port: number }) => void, host?: string): void { nodeDataChannel.listenIceUdpMux(port, cb, host); }
+export function listenIceUdpMux(port: number, cb?: (req: { ufrag: string, host: string, port: number }) => void | null, host?: string | null): void { nodeDataChannel.listenIceUdpMux(port, cb, host); }
 
 export interface Audio {
     addAudioCodec(payloadType: number, codec: string, profile?: string): void;