import { type ChatSummary, type MutationHint, type NotificationLevel } from "../chat/types.js";
import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Upserts the actor's per-chat notification mode in userChatPreferences after confirming the chat remains accessible.
 * The personal sync sequence makes mute or mention-only behavior converge across devices before future badges are interpreted.
 */
export declare function chatNotificationPreferenceSet(executor: DrizzleExecutor, input: {
    actorUserId: string;
    chatId: string;
    notificationLevel?: NotificationLevel;
    mutedUntil?: string | null;
    showMessagePreviews?: boolean;
}): Promise<{
    chat: ChatSummary;
    hint: MutationHint;
}>;
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