import { InViewportDirection } from '../enums';
import { InViewportCheckFn } from './check-fn';
export declare const checkFnId: unique symbol;
export declare const configHash: unique symbol;
export declare class Config {
    #private;
    get root(): Element | null;
    get rootMargin(): string;
    get threshold(): readonly number[];
    get partial(): boolean;
    get direction(): `${InViewportDirection}`;
    get checkFn(): InViewportCheckFn | undefined;
    get [checkFnId](): string;
    get [configHash](): string;
    constructor(options?: (IntersectionObserverInit & {
        partial?: boolean;
        direction?: `${InViewportDirection}`;
        checkFn?: InViewportCheckFn;
    }) | null | undefined);
}