import type { PathwayChunkStore, PathwayChunkStoreResult, StorePathwayChunkPartInput } from "./types.js";
/**
 * In-memory implementation of {@link PathwayChunkStore}.
 *
 * Single-process only: parts held here are invisible to other instances and are
 * lost on restart. Use {@link PostgresPathwayChunkStore} in production.
 */
export declare class InternalPathwayChunkStore implements PathwayChunkStore {
    /** Default time-to-live for incomplete chunks (1 hour) */
    private static readonly DEFAULT_TTL_MS;
    private readonly chunks;
    private readonly ttlMs;
    constructor(options?: {
        ttlMs?: number;
    });
    storePart(input: StorePathwayChunkPartInput): Promise<PathwayChunkStoreResult>;
    deleteChunk(chunkId: string): Promise<void>;
    private cleanupExpired;
}
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