import type { LLMMessage } from '../llm/llm-provider.js';
import type { SessionStore, SessionMeta } from './session.js';
export interface JsonlSessionStoreConfig {
    dir: string;
    maxSessions?: number;
}
export declare class JsonlSessionStore implements SessionStore {
    private readonly dir;
    private readonly maxSessions;
    constructor(config: JsonlSessionStoreConfig);
    private encodedSessionStem;
    private decodeSessionStem;
    private sessionPath;
    private ensureDir;
    private enqueueWrite;
    private appendLineDurably;
    /**
     * Atomic full-file rewrite: write a temp file in the same directory, fsync,
     * then rename over the target. `rename` is atomic on POSIX, so a crash leaves
     * either the previous file or the new one — never a partial truncate. Used by
     * `replaceMessages` to prune accumulated dead lines (prior `state_replace`
     * snapshots and superseded `message` lines) instead of appending yet another
     * full snapshot, which made the session file grow without bound over a long
     * session: every `replaceMessages` appended the full history while replay
     * ignored everything before the latest `state_replace`, so dead bytes
     * accumulated ~ (history size) × (number of replaces).
     */
    private rewriteFileDurably;
    private deriveTitle;
    private replayMessagesFromContent;
    loadMessages(sessionKey: string): Promise<LLMMessage[]>;
    appendMessage(sessionKey: string, message: LLMMessage): Promise<void>;
    replaceMessages(sessionKey: string, messages: LLMMessage[]): Promise<void>;
    private fileExists;
    private pruneOldestSessions;
    listSessions(): Promise<SessionMeta[]>;
    deleteSession(sessionKey: string): Promise<void>;
    exists(sessionKey: string): Promise<boolean>;
}
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