import type { Message } from "@kenkaiiii/gg-ai";
/**
 * Minimal session persistence for `ggeditor continue`.
 *
 * Each TUI run writes its rolling message buffer to ~/.gg/editor/last.json
 * after every turn. `ggeditor continue` reads this file and hydrates a new
 * Agent with the prior messages.
 *
 * No multi-session support yet — just "the most recent conversation". Pairs
 * with the `priorMessages` option added to gg-agent.
 */
export declare const SESSIONS_DIR: string;
export declare const LAST_SESSION_FILE: string;
export interface PersistedSession {
    /** Format version for future compatibility. */
    v: 1;
    /** ISO timestamp of the last update. */
    updatedAt: string;
    /** Provider used for this session. */
    provider: string;
    /** Model used for this session. */
    model: string;
    /** Working directory at start. */
    cwd: string;
    /** Host name in use ("resolve" / "premiere" / "none"). */
    host: string;
    /** Full message buffer EXCLUDING the system prompt. */
    messages: Message[];
}
export declare function saveSession(snapshot: Omit<PersistedSession, "v" | "updatedAt">): Promise<void>;
export declare function loadLastSession(): Promise<PersistedSession | null>;
export declare function hasLastSession(): Promise<boolean>;
/**
 * Drop the system message from a saved messages array. Saved sessions
 * intentionally exclude the system prompt (which gets rebuilt fresh per run
 * to reflect current host caps), but if a future format change includes it,
 * we strip it defensively.
 */
export declare function stripSystem(messages: Message[]): Message[];
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