import { ComponentClass, JSXElementConstructor } from 'react';
/** Return a React component with MainContent, overlayed by OverlayContent when `PluginCustomState(this.plugin).events?.isBusy` last emitted value is true. */
export declare function WithLoadingOverlay(MainContent: JSXElementConstructor<{}>, OverlayContent?: JSXElementConstructor<{}>): ComponentClass<{}>;