import type { HistoryRecord } from "@gryt/crypto";
import type { HistoryArchive, HistoryCursor } from "./interfaces.js";
export declare const dayOf: (sentAt: number) => number;
/** Negative when `a` is newer: by time, then by message id, the same order the archive pages in. */
export declare function newerFirst(a: HistoryCursor, b: HistoryCursor): number;
/** A's archive one UTC day at a time, newest day first across every conversation and server. */
export declare function archiveByDay(archive: HistoryArchive, pageSize?: number): AsyncGenerator<HistoryRecord[]>;