import type { ChartFocusFilter, ChartMark, ChartValue } from './types.js';
export declare function whenFocused<TDatum, TXPointValue extends ChartValue, TYPointValue extends ChartValue, TXScaleValue extends ChartValue, TYScaleValue extends ChartValue>(mark: ChartMark<TDatum, TXPointValue, TYPointValue, TXScaleValue, TYScaleValue>, options?: ChartFocusFilter): ChartMark<TDatum, TXPointValue, TYPointValue, TXScaleValue, TYScaleValue>;