import { type ChatSummary, type MutationHint } from "./types.js";
import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Stores the normalized topic on the authorized chats channel and records the resulting channel change point.
 * Treating topic text as a channel mutation keeps header state and change history ordered with messages and membership events.
 */
export declare function channelTopicUpdate(executor: DrizzleExecutor, actorUserId: string, chatId: string, topic: string | undefined): Promise<{
    chat: ChatSummary;
    hint: MutationHint;
}>;
//# sourceMappingURL=channelTopicUpdate.d.ts.map