> ## Documentation Index
> Fetch the complete documentation index at: https://docs.summerengine.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SummerInventoryChange

> One immutable inventory projection change.

**Class:** `SummerInventoryChange` · **Inherits:** RefCounted

One immutable inventory projection change.

Describes one replacement or removal applied to an inventory projection. Changes are lossy freshness hints over the monotonic projection, never ownership truth; a missed change triggers an engine-owned refresh. Replacements carry the already-applied [`item`](/api-reference/gdscript/types/inventory-change#item); removals carry only identity and sequence.

## Properties

| Property | Type | Access | Description |
| - | - | - | - |
| <a id="as_of_event_sequence" />`as_of_event_sequence` | int | read-only, `get_as_of_event_sequence()` | Monotonic platform event sequence of this change. |
| <a id="item" />`item` | [`SummerInventoryItem`](/api-reference/gdscript/types/inventory-item) | read-only, `get_item()` | The replaced item value after the change, or `null` for removals. |
| <a id="item_id" />`item_id` | String | read-only, `get_item_id()` | Opaque platform item identity this change addresses. |
| <a id="kind" />`kind` | [`SummerInventoryChange.Kind`](/api-reference/gdscript/types/inventory-change#kind) | read-only, `get_kind()` | Whether the item was replaced or removed. |
| <a id="revision" />`revision` | int | read-only, `get_revision()` | Monotonic per-item revision after the change. |

## Enums and constants

### Kind

| Name | Value | Description |
| - | - | - |
| `KIND_REPLACED` | `0` | The item value was replaced at a newer revision. |
| `KIND_REMOVED` | `1` | The item left the projection. |

***

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