Use covariant types for InventoryHolder and Container implementors

src/block/inventory/DoubleChestInventory.php

@@ -41,7 +41,7 @@ class DoubleChestInventory extends BaseInventory implements BlockInventory, Inve
 		parent::__construct();
 	}
 
-	public function getInventory(){
+	public function getInventory() : self{
 		return $this;
 	}
 

src/block/tile/Barrel.php

@@ -56,17 +56,11 @@ class Barrel extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return BarrelInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : BarrelInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return BarrelInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : BarrelInventory{
 		return $this->inventory;
 	}
 

src/block/tile/BrewingStand.php

@@ -112,17 +112,11 @@ class BrewingStand extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return BrewingStandInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : BrewingStandInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return BrewingStandInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : BrewingStandInventory{
 		return $this->inventory;
 	}
 

src/block/tile/Chest.php

@@ -114,20 +114,14 @@ class Chest extends Spawnable implements Container, Nameable{
 		$this->containerTraitBlockDestroyedHook();
 	}
 
-	/**
-	 * @return ChestInventory|DoubleChestInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : ChestInventory|DoubleChestInventory{
 		if($this->isPaired() && $this->doubleInventory === null){
 			$this->checkPairing();
 		}
 		return $this->doubleInventory instanceof DoubleChestInventory ? $this->doubleInventory : $this->inventory;
 	}
 
-	/**
-	 * @return ChestInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : ChestInventory{
 		return $this->inventory;
 	}
 

src/block/tile/Container.php

@@ -30,10 +30,7 @@ interface Container extends InventoryHolder{
 	public const TAG_ITEMS = "Items";
 	public const TAG_LOCK = "Lock";
 
-	/**
-	 * @return Inventory
-	 */
-	public function getRealInventory();
+	public function getRealInventory() : Inventory;
 
 	/**
 	 * Returns whether this container can be opened by an item with the given custom name.

src/block/tile/ContainerTrait.php

@@ -38,10 +38,7 @@ trait ContainerTrait{
 	/** @var string|null */
 	private $lock = null;
 
-	/**
-	 * @return Inventory
-	 */
-	abstract public function getRealInventory();
+	abstract public function getRealInventory() : Inventory;
 
 	protected function loadItems(CompoundTag $tag) : void{
 		if(($inventoryTag = $tag->getTag(Container::TAG_ITEMS)) instanceof ListTag && $inventoryTag->getTagType() === NBT::TAG_Compound){

src/block/tile/Furnace.php

@@ -104,17 +104,11 @@ abstract class Furnace extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return FurnaceInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : FurnaceInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return FurnaceInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : FurnaceInventory{
 		return $this->getInventory();
 	}
 

src/block/tile/Hopper.php

@@ -69,17 +69,11 @@ class Hopper extends Spawnable implements Container, Nameable{
 		return "Hopper";
 	}
 
-	/**
-	 * @return HopperInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : HopperInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return HopperInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : HopperInventory{
 		return $this->inventory;
 	}
 }

src/block/tile/ShulkerBox.php

@@ -93,17 +93,11 @@ class ShulkerBox extends Spawnable implements Container, Nameable{
 		$this->facing = $facing;
 	}
 
-	/**
-	 * @return ShulkerBoxInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : ShulkerBoxInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return ShulkerBoxInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : ShulkerBoxInventory{
 		return $this->inventory;
 	}
 

src/entity/Human.php

@@ -189,10 +189,7 @@ class Human extends Living implements ProjectileSource, InventoryHolder{
 		return min(100, 7 * $this->xpManager->getXpLevel());
 	}
 
-	/**
-	 * @return PlayerInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : PlayerInventory{
 		return $this->inventory;
 	}
 

src/inventory/InventoryHolder.php

@@ -25,10 +25,5 @@ namespace pocketmine\inventory;
 
 interface InventoryHolder{
 
-	/**
-	 * Get the object related inventory
-	 *
-	 * @return Inventory
-	 */
-	public function getInventory();
+	public function getInventory() : Inventory;
 }