import { DatumByKey } from '../XYChart/types';
import { ChartData } from '../types';
export declare const isPositiveModifierKey: (key: string) => boolean;
export declare const getPercentage: ({ original, test }: {
    original: number;
    test: number;
}) => number;
export declare const round2DemicalPlacesAtMost: (value: number) => number;
export declare const getPreviousDatumValueFromNearestDatum: ({ nearestDatum, chartData, }: {
    nearestDatum: DatumByKey;
    chartData: ChartData;
}) => {
    standardDatumValue: any;
    positiveDiffValue: any;
} | null;
export declare const getPositiveDiffAndStandardValues: (datum: ChartData) => {
    standardDatumValue: any;
    positiveDiffValue: any;
};
export declare const getFirstStepDatumValue: (firstStepDatum: ChartData) => any;
export declare const getStandardDatumKeyFromModifier: ({ positiveDiffDatumKey }: {
    positiveDiffDatumKey: string;
}) => string | null;
