/**
 *
 * @param label the label to check for undefined, null or empty
 * @param unknownLabel default: NAN_REPLACEMENT; the label to return if the input label is undefined, null or empty
 * @returns the label if it is not undefined, null or empty, otherwise NAN_REPLACEMENT (Unknown)
 */
export declare function getLabelOrUnknown(label: string | number | null | undefined, unknownLabel?: string): string;
/**
 *
 * @param values the actual values of the data
 * @param colors the colors to assign to the values
 * @param color default: VIS_NEUTRAL_COLOR; the color to assign to null / undefined / empty values
 * @returns an array of colors with the same length as values, with the color assigned to null values
 */
export declare const assignColorToNullValues: (values: string[], colors: string[], color?: string) => string[];
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