import * as React from 'react';
import { InView } from './InView';
export { InView } from './InView';
export { useInView } from './useInView';
export { observe, defaultFallbackInView } from './observe';
export default InView;
declare type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
export declare type ObserverInstanceCallback = (inView: boolean, entry: IntersectionObserverEntry) => void;
interface RenderProps {
    inView: boolean;
    entry: IntersectionObserverEntry | undefined;
    ref: React.RefObject<any> | ((node?: Element | null) => void);
}
export interface IntersectionOptions extends IntersectionObserverInit {
    /** The IntersectionObserver interface's read-only `root` property identifies the Element or Document whose bounds are treated as the bounding box of the viewport for the element which is the observer's target. If the `root` is null, then the bounds of the actual document viewport are used.*/
    root?: Element | null;
    /** Margin around the root. Can have values similar to the CSS margin property, e.g. `10px 20px 30px 40px` (top, right, bottom, left). */
    rootMargin?: string;
    /** Number between `0` and `1` indicating the percentage that should be visible before triggering. Can also be an `array` of numbers, to create multiple trigger points. */
    threshold?: number | number[];
    /** Only trigger the inView callback once */
    triggerOnce?: boolean;
    /** Skip assigning the observer to the `ref` */
    skip?: boolean;
    /** Set the initial value of the `inView` boolean. This can be used if you expect the element to be in the viewport to start with, and you want to trigger something when it leaves. */
    initialInView?: boolean;
    /** Fallback to this inView state if the IntersectionObserver is unsupported, and a polyfill wasn't loaded */
    fallbackInView?: boolean;
    /** IntersectionObserver v2 - Track the actual visibility of the element */
    trackVisibility?: boolean;
    /** IntersectionObserver v2 - Set a minimum delay between notifications */
    delay?: number;
}
export interface IntersectionObserverProps extends IntersectionOptions {
    /**
     * Children expects a function that receives an object
     * contain an `inView` boolean and `ref` that should be
     * assigned to the element root.
     */
    children: (fields: RenderProps) => React.ReactNode;
    /** Call this function whenever the in view state changes */
    onChange?: (inView: boolean, entry: IntersectionObserverEntry) => void;
}
/**
 * Types specific to the PlainChildren rendering of InView
 * */
export declare type PlainChildrenProps = IntersectionOptions & {
    children?: React.ReactNode;
    /**
     * Render the wrapping element as this element.
     * @default `'div'`
     */
    as?: React.ReactType<any>;
    /**
     * Element tag to use for the wrapping component
     * @deprecated Replace with the 'as' prop
     */
    tag?: React.ReactType<any>;
    /** Call this function whenever the in view state changes */
    onChange?: (inView: boolean, entry: IntersectionObserverEntry) => void;
} & Omit<React.HTMLProps<HTMLElement>, 'onChange'>;
/**
 * The Hook response supports both array and object destructing
 */
export declare type InViewHookResponse = [
    (node?: Element | null) => void,
    boolean,
    IntersectionObserverEntry | undefined
] & {
    ref: (node?: Element | null) => void;
    inView: boolean;
    entry?: IntersectionObserverEntry;
};