import { type ChatSummary, type SyncState } from "../chat/types.js";
import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Projects a global sync-event range into chats, removals, and product areas visible to one user.
 * Generation resets, retention bounds, paging, and current access checks are combined here so a client cannot retain revoked or invisible state.
 */
export declare function syncGetDifference(executor: DrizzleExecutor, input: {
    userId: string;
    generation: string;
    fromSequence: number;
    untilSequence?: number;
    limit: number;
}): Promise<{
    kind: "empty" | "difference" | "slice" | "reset";
    changedChats: ChatSummary[];
    removedChatIds: string[];
    areas: string[];
    state: SyncState;
    targetState: SyncState;
}>;
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