import m from 'mithril';
import { IAttrs } from '../../_shared';
export interface IPortalAttrs extends IAttrs {
    /** Callback invoked when the component is mounted */
    onContentMount?: (rootElement: HTMLElement) => void;
    /** Optional HTML element to mount to */
    container?: HTMLElement;
}
export declare class Portal implements m.Component<IPortalAttrs> {
    private rootElement;
    private content;
    oncreate({ attrs, children }: m.Vnode<IPortalAttrs>): void;
    onupdate({ attrs }: m.Vnode<IPortalAttrs>): void;
    onbeforeupdate({ children }: m.Vnode<IPortalAttrs>): false | undefined;
    onremove({ attrs }: m.Vnode<IPortalAttrs>): void;
    view(): m.Vnode<any, any>;
    private setStyles;
}