import type { Checkpoint, EditSession, UpdateMeta } from '../types.js';
/** The gap that ends an edit session. Five minutes, per `04-crdt-and-history.md`. */
export declare const DEFAULT_SESSION_GAP_MS = 300000;
/**
 * Group op-log rows into sessions: same actor, gap under `gap_ms`, and no
 * checkpoint between them.
 *
 * Sessions are **derived at read time and never stored**. That is a deliberate
 * design choice rather than a shortcut: the grouping gap is a UI tuning knob,
 * and storing the grouping would turn "make sessions 3 minutes instead of 5"
 * into a data migration over every document that ever existed.
 *
 * The input is metadata only — the caller reads `seq, actor, frontier,
 * byte_size, created_at` with `LENGTH(update_blob)` computed in SQLite — so
 * listing a document's whole history never pulls an update blob into the
 * isolate. That is what makes the history rail cheap enough to open on every
 * document.
 */
export declare function deriveSessions(updates: readonly UpdateMeta[], checkpoints: readonly Checkpoint[], gap_ms?: number): EditSession[];
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