fix phpstan

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest]
         php: [8.3, 8.2, 8.1]
         stability: [prefer-lowest, prefer-stable]
-        carbon: [2.72, 3.0]
+        carbon: [2.72, 3.2]
 
     name: P${{ matrix.php }} - ${{ matrix.stability }} - Carbon ${{ matrix.carbon }}
 

src/Countries/Ecuador.php

@@ -3,6 +3,7 @@
 namespace Spatie\Holidays\Countries;
 
 use Carbon\CarbonImmutable;
+use Carbon\CarbonInterface;
 use Spatie\Holidays\Concerns\Observable;
 use Spatie\Holidays\Concerns\Translatable;
 use Spatie\Holidays\Contracts\HasTranslations;
@@ -29,7 +30,7 @@ protected function allHolidays(int $year): array
         ], $this->variableHolidays($year));
     }
 
-    public function nearestDay(int $year, int $month, int $day): CarbonImmutable
+    public function nearestDay(int $year, int $month, int $day): CarbonInterface
     {
         $date = CarbonImmutable::createFromDate($year, $month, $day);
 
@@ -42,22 +43,26 @@ public function nearestDay(int $year, int $month, int $day): CarbonImmutable
         }
 
         if ($date->is('Wednesday') || $date->is('Thursday')) {
-            return $date->next(CarbonImmutable::FRIDAY);
+            return $date->next(CarbonInterface::FRIDAY);
         }
 
         return $date;
     }
 
-    public function getChristmasHoliday(int $year): CarbonImmutable
+    public function getChristmasHoliday(int $year): CarbonInterface
     {
         if ($year === 2022) {
-            return $this->sundayToNextMonday('12-25', $year);
+            $observedChristmasDay = $this->sundayToNextMonday('12-25', $year);
+
+            if ($observedChristmasDay !== null ) {
+                return $observedChristmasDay;
+            }
         }
 
         return CarbonImmutable::createFromDate($year, 12, 25);
     }
 
-    /** @return array<string, CarbonImmutable> */
+    /** @return array<string, CarbonInterface> */
     protected function variableHolidays(int $year): array
     {
         $easter = $this->easter($year);