export type AssistantChatHistoryDate = string | number | Date;
export interface AssistantChatHistoryVersion {
    id: string;
    createdAt: AssistantChatHistoryDate;
    editable?: boolean;
    chatContext?: {
        threadId?: string;
        runId?: string;
        turnId?: string;
        phase?: "start" | "end";
    };
}
export declare function coerceAssistantChatHistoryDate(value: unknown): Date | null;
export declare function isAssistantChatHistoryVersion(value: unknown): value is AssistantChatHistoryVersion;