/**
 * Generation parameter interface.
 */
export interface GenerateImageParams {
    prompt: string;
    nsfw_checker?: boolean;
    callBackUrl?: string;
}
/**
 * AI image generation helper class using the GPT Image-2 API.
 */
export declare class ImageGenerator {
    private readonly apiKey;
    private readonly createTaskUrl;
    private readonly queryTaskUrl;
    private readonly defaultModel;
    constructor(apiKey: string, model?: string);
    /**
     * Create an image generation task.
     * @param params Generation parameters.
     */
    createTask(params: GenerateImageParams): Promise<string>;
    /**
     * Query task status.
     * @param taskId Task ID.
     */
    queryTask(taskId: string): Promise<any>;
    /**
     * Generate an image with the complete flow: create task + poll status, with timeout control.
     * @param params Generation parameters.
     * @param onProgress Progress callback.
     * @param timeoutSeconds Timeout in seconds. Defaults to 2 seconds.
     * @returns Image URL on success, or the task ID when the timeout is reached.
     */
    generateImageWithTimeout(params: GenerateImageParams, onProgress?: (message: string, elapsedSeconds: number) => void, timeoutSeconds?: number): Promise<{
        success: true;
        imageUrl: string;
    } | {
        success: false;
        taskId: string;
        reason: 'timeout';
    }>;
}
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