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react-day-picker

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Customizable Date Picker for React

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import type { DateLib } from "../classes/DateLib.js"; import type { DateAfter, DateBefore, DateInterval, DateRange, DayOfWeek } from "../types/index.js"; /** * Checks if the given value is of type {@link DateInterval}. * * @param matcher - The value to check. * @returns `true` if the value is a {@link DateInterval}, otherwise `false`. * @group Utilities */ export function isDateInterval(matcher: unknown): matcher is DateInterval { return Boolean( matcher && typeof matcher === "object" && "before" in matcher && "after" in matcher ); } /** * Checks if the given value is of type {@link DateRange}. * * @param value - The value to check. * @returns `true` if the value is a {@link DateRange}, otherwise `false`. * @group Utilities */ export function isDateRange(value: unknown): value is DateRange { return Boolean(value && typeof value === "object" && "from" in value); } /** * Checks if the given value is of type {@link DateAfter}. * * @param value - The value to check. * @returns `true` if the value is a {@link DateAfter}, otherwise `false`. * @group Utilities */ export function isDateAfterType(value: unknown): value is DateAfter { return Boolean(value && typeof value === "object" && "after" in value); } /** * Checks if the given value is of type {@link DateBefore}. * * @param value - The value to check. * @returns `true` if the value is a {@link DateBefore}, otherwise `false`. * @group Utilities */ export function isDateBeforeType(value: unknown): value is DateBefore { return Boolean(value && typeof value === "object" && "before" in value); } /** * Checks if the given value is of type {@link DayOfWeek}. * * @param value - The value to check. * @returns `true` if the value is a {@link DayOfWeek}, otherwise `false`. * @group Utilities */ export function isDayOfWeekType(value: unknown): value is DayOfWeek { return Boolean(value && typeof value === "object" && "dayOfWeek" in value); } /** * Checks if the given value is an array of valid dates. * * @private * @param value - The value to check. * @param dateLib - The date utility library instance. * @returns `true` if the value is an array of valid dates, otherwise `false`. */ export function isDatesArray( value: unknown, dateLib: DateLib ): value is Date[] { return Array.isArray(value) && value.every(dateLib.isDate); }