Added the ?CheckoutSubject return type to Checkout::getCart()

Changelog.md

@@ -29,7 +29,8 @@
 - Added the `units_sold` and the `last_sale_at` attributes to the master product model (SUM/MAX from variants)
 - Added the `Stockable` interface (Contracts)
 - Added the `Stockable` interface to the `Product` and `MasterProductVariant` models
-- Added the `backorder` field to products and product variants
+- Added the `backorder` field to products and product variants 
+- BC: Added the `?CheckoutSubject` return type to the `getCart()` method of the `Checkout` interface
 - Fixed possible null return type on Billpayer::getName() when is_organization is true but the company name is null
 
 ## 3.x Series

src/Checkout/Changelog.md

@@ -9,6 +9,7 @@
 - Dropped Laravel 9 Support
 - Dropped Enum v3 Support
 - Changed minimal Enum requirement to v4.1
+- BC: Added the `?CheckoutSubject` return type to the `getCart()` method of the `Checkout` interface
 
 ## 3.x Series
 

src/Checkout/CheckoutManager.php

@@ -52,7 +52,7 @@ public function __get(string $name)
     /**
      * @inheritDoc
      */
-    public function getCart()
+    public function getCart(): ?CheckoutSubject
     {
         return $this->store->getCart();
     }

src/Checkout/Contracts/Checkout.php

@@ -20,12 +20,7 @@
 
 interface Checkout
 {
-    /**
-     * Returns the cart
-     * @todo add typehint in v4
-     * @return CheckoutSubject|null
-     */
-    public function getCart();
+    public function getCart(): ?CheckoutSubject;
 
     /**
      * Set the cart for the checkout

src/Checkout/Drivers/BaseCheckoutStore.php

@@ -56,7 +56,7 @@ public function __construct(
     ) {
     }
 
-    public function getCart()
+    public function getCart(): ?CheckoutSubject
     {
         return $this->cart;
     }

src/Checkout/Tests/Example/MemoryStore.php

@@ -46,7 +46,7 @@ public function __get(string $name)
         }
     }
 
-    public function getCart()
+    public function getCart(): ?CheckoutSubject
     {
         return $this->cart;
     }