import { StatCardChange, ChartDataPoint } from './types';
/**
 * Calculates whether the chart data is trending down (first value > last value)
 * @param chartData - Array of chart data points
 * @returns true if trending down, false otherwise
 */
export declare const calculateTrend: (chartData?: ChartDataPoint[]) => boolean;
/**
 * Calculates delta change from chart data (first vs last value)
 * @param chartData - Array of chart data points
 * @returns Calculated change object with value and valueType, or null if calculation is not possible
 */
export declare const calculateChangeFromChartData: (chartData?: ChartDataPoint[]) => Pick<StatCardChange, "value" | "valueType"> | null;
/**
 * Gets the effective change to use for display
 * Uses provided change prop if available, otherwise calculates from chartData
 * @param change - Optional change prop from component
 * @param chartData - Array of chart data points
 * @returns Effective change object or null
 */
export declare const getEffectiveChange: (change?: StatCardChange | null | undefined, chartData?: ChartDataPoint[]) => StatCardChange | Pick<StatCardChange, "value" | "valueType"> | null;
/**
 * Determines if decrease color should be shown
 * Uses effectiveChange valueType if available, otherwise falls back to trend calculation
 * @param effectiveChange - The effective change object (from prop or calculated)
 * @param isTrendingDown - Whether chart data is trending down
 * @returns true if decrease color should be shown, false for increase
 */
export declare const shouldShowDecreaseColor: (effectiveChange: StatCardChange | Pick<StatCardChange, "value" | "valueType"> | null, isTrendingDown: boolean) => boolean;