/**
 * Time Scale Validation
 *
 * Prevents ChartJS from crashing when a time unit is incompatible with the data range.
 * Example: timeUnit="day" with data spanning 1600-2020 (420 years) would generate
 * ~153,000 ticks, exceeding ChartJS's 100,000 limit and causing a hard crash.
 */
import type { DataFrame } from 'types';
import type { TimeCartesianAxisConfiguration } from './types';
export type TimeUnit = NonNullable<TimeCartesianAxisConfiguration['timeUnit']>;
/**
 * Checks if a time unit is safe to use with the given min/max values.
 * Used by the Platform to filter available timescale options in the UI.
 *
 * @example
 * isTimeUnitCompatible("1600-01-01", "2024-01-01", "day")   // false (424 years!)
 * isTimeUnitCompatible("1600-01-01", "2024-01-01", "year")  // true
 * isTimeUnitCompatible("2024-01-01", "2024-12-31", "day")   // true
 */
export declare function isTimeUnitCompatible(min: unknown, max: unknown, unit: TimeUnit): boolean;
/**
 * Returns a safe time unit for ChartJS, or undefined to let it auto-detect.
 * Used internally by scales.ts to prevent crashes.
 *
 * @param dataFrame - The chart data
 * @param requestedUnit - The user-configured time unit (may be undefined)
 * @param labelColumn - The column containing date values (default: 'x')
 */
export declare function getSafeTimeUnit(dataFrame: DataFrame, requestedUnit: TimeUnit | undefined, labelColumn?: string): TimeUnit | undefined;