react-day-picker/dist/esm/utils/addToRange.js

Customizable Date Picker for React

import { dateLib as defaultDateLib } from "../lib/index.js";
/**
 * Add a day to an existing range.
 *
 * The returned range takes in account the `undefined` values and if the added
 * day is already present in the range.
 *
 * @group Utilities
 */
export function addToRange(date, range, 
/** @ignore */
dateLib = defaultDateLib) {
    const { from, to } = range || {};
    const { isSameDay, isAfter, isBefore } = dateLib;
    if (from && to) {
        if (isSameDay(to, date) && isSameDay(from, date)) {
            return { from: undefined, to: undefined };
        }
        if (isSameDay(to, date)) {
            return { from: to, to: undefined };
        }
        if (isSameDay(from, date)) {
            return { from: undefined, to: undefined };
        }
        if (isAfter(from, date)) {
            return { from: date, to };
        }
        return { from, to: date };
    }
    if (to) {
        if (isAfter(date, to)) {
            return { from: to, to: date };
        }
        return { from: date, to };
    }
    if (from) {
        if (isBefore(date, from)) {
            return { from: date, to: from };
        }
        if (isSameDay(date, from)) {
            return { from: undefined, to: undefined };
        }
        return { from, to: date };
    }
    return { from: date, to: undefined };
}
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