import { AxisConfig } from "../models/index.js";
import { ChartsAxisProps } from "../models/axis.js";
/**
 * Checks if the provided data array contains Date objects.
 * @param data The data array to check.
 * @returns A type predicate indicating if the data is an array of Date objects.
 */
export declare const isDateData: (data?: readonly any[]) => data is Date[];
/**
 * Creates a formatter function for date values.
 * @param axis The axis configuration.
 * @param range The range for the time scale.
 * @returns A formatter function for date values.
 */
export declare function createDateFormatter(axis: AxisConfig<'band' | 'point', any, ChartsAxisProps>, range: number[]): AxisConfig<'band' | 'point', any, ChartsAxisProps>['valueFormatter'];