Added new hooks to context hook typings

Author: jeffreylanters

module/source/types/unity-context-hook.ts

@@ -88,6 +88,19 @@ type UnityContextHook = EventSystemHook & {
    * @returns A promise that resolves when the UnityInstance has been unloaded.
    */
   readonly unload: () => Promise<void>;
+
+  /**
+   * Detatches the Unity Instance from the React DOM, by doing so, the Unity
+   * Instance can be unloaded from the memory while the Unity component can be
+   * unmounted safely.
+   *
+   * Warning! This is a workaround for the fact that the Unity WebGL instances
+   * which are build with Unity 2021.2 and newer cannot be unmounted before the
+   * Unity Instance is unloaded.
+   * @see https://github.com/jeffreylanters/react-unity-webgl/issues/22
+   * @returns A promise that resolves when the UnityInstance has been detached.
+   */
+  readonly UNSAFE__detachAndUnloadImmediate: () => Promise<void>;
 };
 
 export type { UnityContextHook };