import type { ChatMessage, JsonObject } from "./types.js";
declare const SCHEMA_VERSION = 1;
export interface SessionHeader {
    schema: typeof SCHEMA_VERSION;
    sessionId: string;
    createdAt: string;
    lastUsedAt: string;
    model: string;
    messageCount: number;
}
export interface SessionState {
    schema: number;
    header: SessionHeader;
    messages: ChatMessage[];
}
export declare function newSession(model: string): SessionState;
/**
 * Paperclip `AdapterSessionCodec` implementation.
 * - `serialize` turns the in-memory session into a plain JSON object
 *   that Paperclip persists in JSONB.
 * - `deserialize` is the inverse: a JSON object (or null) back into
 *   the session.
 * - `getDisplayId` returns the short session id for the UI.
 */
export declare const sessionCodec: {
    serialize(params: Record<string, unknown> | null): Record<string, unknown> | null;
    deserialize(raw: unknown): Record<string, unknown> | null;
    getDisplayId(params: Record<string, unknown> | null): string | null;
};
export declare function defaultSessionDir(workspacePath?: string): string;
export declare function appendTranscript(state: SessionState, event: JsonObject): void;
export {};
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