import { DurationString } from './duration';
export type UnixTimeMs = number;
export type DateTimeFormat = number | string;
export interface AbsoluteTimeRange {
    start: Date;
    end: Date;
}
export interface RelativeTimeRange {
    end?: Date;
    pastDuration: DurationString;
}
export type TimeRangeValue = AbsoluteTimeRange | RelativeTimeRange;
/**
 * Determine whether a given time range is relative
 */
export declare function isRelativeTimeRange(timeRange: TimeRangeValue): timeRange is RelativeTimeRange;
/**
 * Determine whether a given time range is absolute
 */
export declare function isAbsoluteTimeRange(timeRange: TimeRangeValue): timeRange is AbsoluteTimeRange;
/**
 * Returns an absolute time range from a RelativeTimeRange.
 */
export declare function toAbsoluteTimeRange(timeRange: RelativeTimeRange): AbsoluteTimeRange;
/**
 * Round interval to clearer increments
 */
export declare function roundStepInterval(stepMs: number): number;
/**
 * Gets a suggested step/interval size for a time range based on the width of a visual component.
 */
export declare function getSuggestedStepMs(timeRange: AbsoluteTimeRange, width: number): number;
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