import { StateDatabase } from "./database.js";
import { type JsonValue } from "./json.js";
export declare const VIEWER_DELTA_RETENTION = 256;
export declare const VIEWER_PAGE_SIZE = 256;
export type ViewerTargetType = "summary" | "graph" | "replay" | "timeline" | "conversation" | "inspector";
export type ViewerPatchOperation = {
    op: "add" | "replace";
    path: string;
    value: JsonValue;
} | {
    op: "remove";
    path: string;
} | {
    op: "append";
    path: string;
    value: JsonValue[];
};
export type ViewerDeltaDraft = {
    targetType: ViewerTargetType;
    targetKey?: string;
    patch?: ViewerPatchOperation[];
};
export type ViewerTailItem = JsonValue;
export type ViewerDeltaRecord = {
    runId: string;
    presentationRevision: number;
    deltaIndex: number;
    targetType: ViewerTargetType;
    targetKey: string;
    patch: ViewerPatchOperation[];
    recordedAt: number;
};
export type ViewerCursorResult = {
    kind: "deltas";
    currentRevision: number;
    retainedFromRevision: number;
    deltas: ViewerDeltaRecord[];
} | {
    kind: "snapshot_required";
    currentRevision: number;
    retainedFromRevision: number;
};
export declare function initializeViewerRun(state: StateDatabase, runId: string, now: number): number;
export declare function recordViewerDeltas(state: StateDatabase, runId: string, drafts: readonly ViewerDeltaDraft[], now?: number): number;
export declare function viewerTailPatch(oldTotal: number, items: readonly ViewerTailItem[]): ViewerPatchOperation[];
export declare function readViewerDeltas(state: StateDatabase, runId: string, afterRevision: number): ViewerCursorResult;