60 lines
2 KiB
TypeScript
60 lines
2 KiB
TypeScript
import type { ContextOptions, DateArg } from "./types.js";
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/**
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* The {@link closestTo} function options.
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*/
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export interface ClosestToOptions<DateType extends Date = Date>
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extends ContextOptions<DateType> {}
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/**
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* The {@link closestTo} function result type. It resolves the proper data type.
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* It uses the first argument date object type, starting from the date argument,
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* then the start interval date, and finally the end interval date. If
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* a context function is passed, it uses the context function return type.
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*/
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export type ClosestToResult<
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DateToCompare extends DateArg<Date>,
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DatesType extends DateArg<Date>[],
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Options extends ClosestToOptions | undefined,
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> =
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Options extends ClosestToOptions<infer DateType extends Date>
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? DateType
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: DateToCompare extends Date
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? DateToCompare
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: DatesType extends DateArg<infer DateType>[]
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? DateType
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: Date;
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/**
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* @name closestTo
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* @category Common Helpers
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* @summary Return a date from the array closest to the given date.
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*
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* @description
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* Return a date from the array closest to the given date.
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*
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* @typeParam DateToCompare - Date to compare argument type.
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* @typeParam DatesType - Dates array argument type.
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* @typeParam Options - Options type.
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*
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* @param dateToCompare - The date to compare with
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* @param dates - The array to search
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*
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* @returns The date from the array closest to the given date or undefined if no valid value is given
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*
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* @example
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* // Which date is closer to 6 September 2015: 1 January 2000 or 1 January 2030?
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* const dateToCompare = new Date(2015, 8, 6)
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* const result = closestTo(dateToCompare, [
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* new Date(2000, 0, 1),
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* new Date(2030, 0, 1)
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* ])
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* //=> Tue Jan 01 2030 00:00:00
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*/
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export declare function closestTo<
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DateToCompare extends DateArg<Date>,
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DatesType extends DateArg<Date>[],
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Options extends ClosestToOptions | undefined = undefined,
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>(
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dateToCompare: DateToCompare,
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dates: DatesType,
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options?: Options | undefined,
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): ClosestToResult<DateToCompare, DatesType, Options> | undefined;
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