/**
 * 图片加载工具函数
 */
export interface ImageInfo {
    src: string;
    alt: string;
    width: number;
    height: number;
}
/**
 * 预加载图片并获取尺寸信息
 */
export declare const preloadImage: (src: string) => Promise<ImageInfo>;
/**
 * 批量预加载图片
 */
export declare const preloadImages: (srcs: string[]) => Promise<ImageInfo[]>;
/**
 * 检查图片URL是否有效
 */
export declare const isValidImageUrl: (url: string) => boolean;
/**
 * 获取图片的缩略图URL（如果支持）
 */
export declare const getThumbnailUrl: (url: string, size?: number) => string;
/**
 * 生成图片的唯一标识符
 */
export declare const generateImageId: (src: string, alt: string) => string;