/**
 * Record classification for the JSONL store — pure, no I/O, no imports beyond types.
 *
 * WHY THIS FILE EXISTS
 *
 * These predicates decide what a line in the store IS. They were private to
 * jsonl-preservation.ts, which cannot be imported by a renderer because its first line
 * is `import fs`. So the read contract re-implemented them by hand — and got it wrong:
 * it dropped the legacy `type:"narrative_beat"` dialect this package still writes and
 * reads, losing real beats AND reporting them as corruption.
 *
 * Splitting them out costs nothing and means classification has exactly one definition.
 * jsonl-preservation.ts imports it, so the writer round-trips through these; contract.ts
 * imports it, so a reader classifies identically. They cannot drift, because there is
 * no second copy to drift from.
 */
import type { Entity, JsonlRecord } from './types.js';
export declare function isObject(value: unknown): value is Record<string, unknown>;
export declare function removeUndefined<T extends Record<string, unknown>>(record: T): T;
export declare function isEntityRecord(record: JsonlRecord): boolean;
/**
 * The older on-disk dialect: a beat written with `type:"narrative_beat"` at the top
 * level instead of `type:"entity"` + `entityType:"narrative_beat"`. Still present in
 * live stores, still round-tripped by serializeEntity, still asserted by
 * test-metadata-preservation.js. A reader that does not know this dialect silently
 * renders fewer beats than exist.
 */
export declare function isLegacyNarrativeBeatRecord(record: JsonlRecord): boolean;
export declare function isRelationRecord(record: JsonlRecord): boolean;
export declare function normalizeLegacyNarrativeBeat(record: JsonlRecord): Entity;