import { AriaAttributes } from 'react';
import type { CSSProperties, ReactElement } from 'react';
export type NativeProps<S extends string = never> = {
    className?: string;
    style?: CSSProperties & Partial<Record<S, string>>;
    tabIndex?: number;
} & AriaAttributes;
export declare function withNativeProps<P extends NativeProps>(props: P, element: ReactElement): any;
export declare function toCSSLength(val: string | number): string;
export declare const useIsomorphicUpdateLayoutEffect: typeof import("react").useEffect | typeof import("react").useLayoutEffect;
export declare function mergeProps<A, B>(a: A, b: B): B & A;
export declare function mergeProps<A, B, C>(a: A, b: B, c: C): C & B & A;