1import * as React from "react";
2import { ValidationMap } from "../../common/context";
3import { Props } from "../../common/props";
4export declare type PortalProps = IPortalProps;
5export interface IPortalProps extends Props {
6    /**
7     * Callback invoked when the children of this `Portal` have been added to the DOM.
8     */
9    onChildrenMount?: () => void;
10    /**
11     * The HTML element that children will be mounted to.
12     *
13     * @default document.body
14     */
15    container?: HTMLElement;
16}
17export interface IPortalState {
18    hasMounted: boolean;
19}
20export interface IPortalContext {
21    /** Additional CSS classes to add to all `Portal` elements in this React context. */
22    blueprintPortalClassName?: string;
23}
24/**
25 * This component detaches its contents and re-attaches them to document.body.
26 * Use it when you need to circumvent DOM z-stacking (for dialogs, popovers, etc.).
27 * Any class names passed to this element will be propagated to the new container element on document.body.
28 */
29export declare class Portal extends React.Component<IPortalProps, IPortalState> {
30    static displayName: string;
31    static contextTypes: ValidationMap<IPortalContext>;
32    static defaultProps: IPortalProps;
33    context: IPortalContext;
34    state: IPortalState;
35    private portalElement;
36    render(): React.ReactPortal | null;
37    componentDidMount(): void;
38    componentDidUpdate(prevProps: IPortalProps): void;
39    componentWillUnmount(): void;
40    private createContainerElement;
41    private unstableRenderNoPortal;
42}
43