import { CSSProperties, ReactElement } from 'react';
type Timeout = number | {
    enter?: number;
    exit?: number;
};
export interface FadeProps {
    in?: boolean;
    timeout?: Timeout;
    appear?: boolean;
    children: ReactElement;
    onEnter?: () => void;
    onExited?: () => void;
    style?: CSSProperties;
}
/**
 * Opacity transition (replaces MUI `Fade`). Clones its single child and runs a CSS keyframe on
 * enter/exit, keeping the child mounted through the exit tween before calling `onExited` (so a
 * parent `Popper` can unmount it). Public props preserved (DEC-003). TASK-403.
 */
export declare const Fade: ({ in: inProp, timeout, children, onExited, style, }: FadeProps) => JSX.Element | null;
export {};