export declare const attachProps: (node: HTMLElement, newProps: any, oldProps?: any) => void;
export declare const getClassName: (classList: DOMTokenList, newProps: any, oldProps: any) => string;
/**
 * Checks if an event is supported in the current execution environment.
 * @license Modernizr 3.0.0pre (Custom Build) | MIT
 */
export declare const isCoveredByReact: (eventNameSuffix: string, doc: Document) => boolean;
export declare const syncEvent: (node: Element & {
    __events?: {
        [key: string]: ((e: Event) => any) | undefined;
    };
}, eventName: string, newEventHandler?: (e: Event) => any) => void;
