/**
 * Calls the Gemini API to generate a set of image prompts based on seed prompts and a theme.
 *
 * @param seedSet - Array of seed prompt strings.
 * @param theme - The overall theme.
 * @param apiKey - The Google Generative AI API key (optional).
 * @returns A Promise resolving to an array of generated prompt strings.
 */
export declare function generateSeedPrompts(seedSet: string[], theme: string, apiKey?: string): Promise<string[]>;