Fix durabilityUsed for items with components

Fixes #121

Update `durabilityUsed` getter to support items with components.

* Modify `durabilityUsed` getter in `index.js` to check the `components` array for the `damage` component.
* Use the `damage` component value for `durabilityUsed` if found.
* Fall back to checking the `Damage` field in `nbt` or `metadata` if the `damage` component is not found.
* Add test cases in `test/basic.test.js` to verify `durabilityUsed` returns the correct value for items with and without the `damage` component.

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/PrismarineJS/prismarine-item/issues/121?shareId=XXXX-XXXX-XXXX-XXXX).

Author: rom1504

index.js

@@ -330,9 +330,20 @@ function loader (registryOrVersion) {
     get durabilityUsed () {
       const where = registry.supportFeature('whereDurabilityIsSerialized')
       let ret
-      if (where === 'Damage') ret = this.nbt?.value?.Damage?.value
-      else if (where === 'metadata') ret = this.metadata
-      else throw new Error('unknown durability location')
+
+      if (this.components && this.components.length > 0) {
+        const damageComponent = this.components.find(component => component.type === 'damage')
+        if (damageComponent) {
+          ret = damageComponent.data
+        }
+      }
+
+      if (ret === undefined) {
+        if (where === 'Damage') ret = this.nbt?.value?.Damage?.value
+        else if (where === 'metadata') ret = this.metadata
+        else throw new Error('unknown durability location')
+      }
+
       return ret ?? (this.maxDurability ? 0 : null)
     }
 

test/basic.test.js

@@ -447,3 +447,41 @@ describe('use Item.equal', () => {
     expect(Item.equal(itemOne, itemTwo)).toStrictEqual(false)
   })
 })
+
+describe('durabilityUsed with damage component', () => {
+  const Item = require('prismarine-item')('1.20.5')
+
+  it('should return correct durabilityUsed for item with damage component', () => {
+    const item = new Item(830, 1, 0, {
+      type: 'compound',
+      name: '',
+      value: {
+        Damage: {
+          type: 'int',
+          value: 0
+        }
+      }
+    })
+    item.components = [
+      {
+        type: 'damage',
+        data: 15
+      }
+    ]
+    expect(item.durabilityUsed).toBe(15)
+  })
+
+  it('should return correct durabilityUsed for item without damage component', () => {
+    const item = new Item(830, 1, 0, {
+      type: 'compound',
+      name: '',
+      value: {
+        Damage: {
+          type: 'int',
+          value: 10
+        }
+      }
+    })
+    expect(item.durabilityUsed).toBe(10)
+  })
+})