export declare const MEET_DM_TOPIC_THREAD_PREFIX = "meetdm_b64_";
export declare function isEncodedMeetDmTopicThreadId(threadId?: string | null): boolean;
export declare function encodeMeetDmTopicId(raw?: string | null): string | undefined;
export declare function decodeMeetDmTopicThreadId(threadId?: string | null): string | undefined;