/**
 * This module contains type guards that can be used to determine which
 * plot data type you have when `UnionOfPlotDataTypes` is allowed.
 */
import { NumberOrDate, TimeUnit, TimeDelta, NumberOrTimeDelta } from './general';
import { FacetedData, FacetedPlotRef, HistogramData, PiePlotData, PlotRef, UnionOfPlotDataTypes } from './plots';
import { LinePlotData } from './plots/lineplot';
/** Determine if data is for a histogram plot. */
export declare function isHistogramData(data: UnionOfPlotDataTypes): data is HistogramData;
/** Determine if data is for a pie plot. */
export declare function isPiePlotData(data: UnionOfPlotDataTypes): data is PiePlotData;
/** Determine if data is for a line plot. */
export declare function isLinePlotData(data: UnionOfPlotDataTypes): data is LinePlotData;
/** WARNING - THIS IS NOT A GOOD TEST. Date("22") is a valid date
 * luckily it's not used in any production code
 */
/** Determine if a NumberOrDate variable is a string that can be converted to a date */
export declare function isDate(date: NumberOrDate): date is string;
export declare function isNumber(x: any): x is number;
/** Determine if a date/time quantity is a TimeUnit */
export declare function isTimeUnit(maybeTimeUnit: string): maybeTimeUnit is TimeUnit;
/** Determine if a NumberOrTimeDelta is a TimeDelta */
export declare function isTimeDelta(maybeTimeDelta: NumberOrTimeDelta): maybeTimeDelta is TimeDelta;
/** Is data faceted or not? */
export declare function isFaceted<T>(maybeFacetedData?: T | FacetedData<T>): maybeFacetedData is FacetedData<T>;
/** Is this plot ref a FacetedPlotRef? */
export declare function isFacetedPlotRef(maybeFacetedPlotRef?: FacetedPlotRef | PlotRef): maybeFacetedPlotRef is FacetedPlotRef;
export declare function isArrayOfNumbers(array: string[] | number[]): array is number[];
export declare function isArrayOfNumbersOrNulls(array: (string | number | null)[]): array is (number | null)[];
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