import { Config } from './config';
export interface InViewportCheckFnOptions {
    /**
     *  Whether action was triggered programmatically.
     */
    force: boolean;
    /**
     *  When an action is triggered programmatically, this property will hold a simulated visibility state.
     */
    forcedValue?: boolean;
    /**
     *  Instance of a configuration object.
     */
    config: Config;
}
export interface InViewportCheckFn<T = any> {
    (entry: IntersectionObserverEntry | undefined, options: InViewportCheckFnOptions): T;
}
export declare class CheckFn<T = any> {
    #private;
    get value(): InViewportCheckFn<T> | undefined;
    get id(): string;
    constructor(value: InViewportCheckFn<T> | null | undefined);
}