export interface PersistableAttachment {
    kind: "image" | "audio" | "file";
    dataUrl: string;
    mimeType?: string;
    name?: string;
    size?: number;
    path?: string;
}
export interface PersistableMessage {
    role: "user" | "assistant";
    attachments?: PersistableAttachment[];
}
type ParsedDataUrl = {
    mimeType: string;
    data: string;
};
export declare function persistAssistantImagesToDisk(input: {
    dbPath: string;
    sessionId: string;
    messages: PersistableMessage[];
}): void;
export declare function getSessionMediaDirectory(dbPath: string, sessionId: string): string;
export declare function removeSessionMediaDirectory(dbPath: string, sessionId: string): void;
export declare function parseBase64DataUrl(dataUrl: string): ParsedDataUrl | null;
export declare function resolveImageExtension(mimeType: string): string;
export {};