import { type AttributeReactiveClass } from '../../element-reactive/index.js';
export declare class ImageSrc implements InstanceType<AttributeReactiveClass<typeof HTMLElement>> {
    #private;
    static observedAttributes: string[];
    _handleSrc: (this: void, newVal: string | null) => void;
    _preloadPlaceholder(newVal: string | null): void;
    _handleBlurRadius: (this: void, newVal: string | null) => void;
    _handleCrossorigin: (this: void, newVal: string | null) => void;
    _handleReferrerpolicy: (this: void, newVal: string | null) => void;
    constructor(dom: HTMLElement);
    connectedCallback(): void;
}