import { type RefObject } from 'react';
import { CoinflowIFrameExposedFunctions } from './CoinflowIFrame';
export declare function useOverlay(iframeRef: RefObject<CoinflowIFrameExposedFunctions | null> | null): {
    messageReceived: boolean;
    showOverlay: boolean;
    opacity: number;
    display: string;
};