export declare namespace IsInView {
    interface Options {
        once: boolean;
        threshold: number;
    }
    interface Details {
        isAboveView: boolean;
        isInView: boolean;
        isBelowView: boolean;
    }
    type Callback = (target: Element, details: Details) => void;
    type Target = Element | NodeListOf<Element>;
    type CallbackRegistrar = (target: IsInView.Target, callback: IsInView.Callback, options?: Partial<IsInView.Options>) => void;
}
export declare function isSupported(): boolean;
export declare const isInView: IsInView.CallbackRegistrar;
export declare const isOutOfView: IsInView.CallbackRegistrar;