export declare const noop: () => void;
export declare type State = {
    width: number;
    height: number;
    running: boolean;
};
export declare type ObserverProps = {
    id: string;
    onResize?: (args: Pick<State, "width" | "height">) => void;
    onExit?: (args: Pick<State, "width" | "height">) => void;
};