/**
 * Retrieves the Gemini API key.
 * Prefers the key passed as an argument, falls back to the environment variable.
 *
 * @param cliKey - The API key passed via CLI argument (optional).
 * @returns The API key string, or undefined if not found in either source.
 */
export declare function getGeminiApiKey(cliKey?: string): string | undefined;
/**
 * Retrieves the Retro Diffusion API key.
 * Prefers the key passed as an argument, falls back to the environment variable.
 *
 * @param cliKey - The API key passed via CLI argument (optional).
 * @returns The API key string, or undefined if not found in either source.
 */
export declare function getRetroDiffusionApiKey(cliKey?: string): string | undefined;