import { type ChatSummary, type MessageSummary } from "../chat/types.js";
import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Reconciles one accessible chat from a membership epoch and points cursor, including affected message projections.
 * Reset, retention, slicing, and future-cursor decisions live here so clients advance chat state without skipping durable updates.
 */
export declare function chatSyncGetDifference(executor: DrizzleExecutor, input: {
    userId: string;
    chatId: string;
    membershipEpoch: string;
    fromPts: number;
    untilPts?: number;
    limit: number;
}): Promise<{
    kind: "empty" | "difference" | "slice" | "reset" | "tooLong";
    updates: Array<{
        pts: string;
        ptsCount: 1;
        kind: string;
        entityId?: string;
    }>;
    messages: MessageSummary[];
    chat: ChatSummary;
    state: {
        membershipEpoch: string;
        pts: string;
    };
    targetState: {
        membershipEpoch: string;
        pts: string;
    };
}>;
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