export type ContinuationEntry = {
    conversationId: string;
    messageId: string;
    model: string;
    sessionId?: string;
    createdAt: number;
};
export type ContinuationExpectation = {
    sessionId?: string;
};
export declare function putContinuation(responseId: string, entry: Omit<ContinuationEntry, "createdAt">): void;
/**
 * Look up a continuation entry. Entries expire after a TTL (default 6h,
 * override CHATGPT_WEB_CONTINUATION_TTL_MS) and are validated against the
 * requesting session when both sides carry a session id — a response id from
 * one OpenCode session must not resume another session's ChatGPT conversation.
 * Model switches are allowed: ChatGPT web supports changing models within a
 * conversation and OpenCode sessions can switch models mid-thread.
 */
export declare function getContinuation(responseId: string, expect?: ContinuationExpectation): ContinuationEntry | undefined;
export declare function clearContinuation(responseId: string): void;
export declare function clearContinuationsForSession(sessionId: string): void;
export declare function clearAllContinuations(): void;
/** Testing helper */
export declare function continuationSize(): number;
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