import type { DatePickerExtractionUnit, DatePickerOperator, DatePickerTruncationUnit, DatePickerUnit } from "./types";
export declare function isDatePickerOperator(operator: string): operator is DatePickerOperator;
export declare function isDatePickerUnit(unit: string): unit is DatePickerUnit;
export declare function isDatePickerTruncationUnit(unit: string): unit is DatePickerTruncationUnit;
export declare function isDatePickerExtractionUnit(unit: string): unit is DatePickerExtractionUnit;
