export declare function showIf(cond: boolean): {
    style?: React.CSSProperties;
};
/** Returns a CSS block to show the element only when marker name begins with `prefix` */
export declare function during(prefix: string): {
    "data-during": string;
};
/** Returns a CSS block to show the element when marker is in [first, last) */
export declare function from(first: string, last?: string): {
    "data-from-first": string;
    "data-from-last": string;
};