From 90fdf4db795a6fc8bb6339174a5fb4586d873054 Mon Sep 17 00:00:00 2001
From: mrholek <lukasz@holeczek.pl>
Date: Tue, 14 Jul 2026 02:20:15 +0200
Subject: [PATCH] fix: avoid Array.prototype.at() to support the declared
 browser range

Array.prototype.at() requires Chrome 92 / Safari 15.4 / iOS 15.4, but
.browserslistrc declares Chrome >= 60 and Safari >= 12, and the build does not
polyfill (no useBuiltIns). Replace .at(-1) with index access so ChipInput,
ChipSet and the calendar util run on the supported browsers.
---
 js/src/chip-input.js    | 8 ++++----
 js/src/chip-set.js      | 2 +-
 js/src/util/calendar.js | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/js/src/chip-input.js b/js/src/chip-input.js
index 585638da9..19ac7719f 100644
--- a/js/src/chip-input.js
+++ b/js/src/chip-input.js
@@ -166,7 +166,7 @@ class ChipInput extends ChipSet {
       // direction is mirrored in RTL.
       if (event.key === (isRTL() ? 'ArrowLeft' : 'ArrowRight')) {
         const chips = this._getFocusableChips()
-        if (chips.length > 0 && chips.at(-1).contains(event.target)) {
+        if (chips.length > 0 && chips[chips.length - 1].contains(event.target)) {
           event.preventDefault()
           this._input.focus()
           return
@@ -271,7 +271,7 @@ class ChipInput extends ChipSet {
           const chips = this._getChipElements()
 
           if (chips.length > 0) {
-            chips.at(-1).focus()
+            chips[chips.length - 1].focus()
           }
         }
 
@@ -292,7 +292,7 @@ class ChipInput extends ChipSet {
           const chips = this._getChipElements()
 
           if (chips.length > 0) {
-            chips.at(-1).focus()
+            chips[chips.length - 1].focus()
           }
         }
 
@@ -323,7 +323,7 @@ class ChipInput extends ChipSet {
         this.add(part.trim())
       }
 
-      this._input.value = parts.at(-1)
+      this._input.value = parts[parts.length - 1]
     }
 
     this._setInputSize()
diff --git a/js/src/chip-set.js b/js/src/chip-set.js
index a6b072e42..808c58d78 100644
--- a/js/src/chip-set.js
+++ b/js/src/chip-set.js
@@ -428,7 +428,7 @@ class ChipSet extends BaseComponent {
 
   _navigateToEdge(targetIndex) {
     const chips = this._getFocusableChips()
-    chips.at(targetIndex)?.focus()
+    chips[targetIndex < 0 ? chips.length + targetIndex : targetIndex]?.focus()
   }
 
   _handleSelectionChange(event) {
diff --git a/js/src/util/calendar.js b/js/src/util/calendar.js
index f4a1049da..7bb077f9f 100644
--- a/js/src/util/calendar.js
+++ b/js/src/util/calendar.js
@@ -859,13 +859,13 @@ export const getMonthDetails = (year, month, firstDayOfWeek) => {
 
     if ((index + 1) % 7 === 0) {
       const { weekNumber, year } = getISOWeekNumberAndYear(day.date)
-      const lastWeek = weeks.at(-1)
+      const lastWeek = weeks[weeks.length - 1]
       if (lastWeek) {
         lastWeek.week = { number: weekNumber, year }
       }
     }
 
-    const lastWeek = weeks.at(-1)
+    const lastWeek = weeks[weeks.length - 1]
     if (lastWeek) {
       lastWeek.days.push(day)
     }