fix(nodes): use forward declarations for InvocationServices

Also use `TYPE_CHECKING` to get IDE hints.

invokeai/app/services/invocation_services.py

@@ -1,18 +1,17 @@
 # Copyright (c) 2022 Kyle Schouviller (https://github.com/kyle0654) and the InvokeAI Team
+from __future__ import annotations
 from typing import TYPE_CHECKING
-from logging import Logger
-
-from invokeai.app.services.images import ImageService
-from invokeai.backend import ModelManager
-from .events import EventServiceBase
-from .latent_storage import LatentsStorageBase
-from .restoration_services import RestorationServices
-from .invocation_queue import InvocationQueueABC
-from .item_storage import ItemStorageABC
-from .config import InvokeAISettings
-
 
 if TYPE_CHECKING:
+    from logging import Logger
+    from invokeai.app.services.images import ImageService
+    from invokeai.backend import ModelManager
+    from invokeai.app.services.events import EventServiceBase
+    from invokeai.app.services.latent_storage import LatentsStorageBase
+    from invokeai.app.services.restoration_services import RestorationServices
+    from invokeai.app.services.invocation_queue import InvocationQueueABC
+    from invokeai.app.services.item_storage import ItemStorageABC
+    from invokeai.app.services.config import InvokeAISettings
     from invokeai.app.services.graph import GraphExecutionState, LibraryGraph
     from invokeai.app.services.invoker import InvocationProcessorABC
 
@@ -20,32 +19,33 @@ if TYPE_CHECKING:
 class InvocationServices:
     """Services that can be used by invocations"""
 
-    events: EventServiceBase
-    latents: LatentsStorageBase
-    queue: InvocationQueueABC
-    model_manager: ModelManager
-    restoration: RestorationServices
-    configuration: InvokeAISettings
-    images: ImageService
+    # TODO: Just forward-declared everything due to circular dependencies. Fix structure.
+    events: "EventServiceBase"
+    latents: "LatentsStorageBase"
+    queue: "InvocationQueueABC"
+    model_manager: "ModelManager"
+    restoration: "RestorationServices"
+    configuration: "InvokeAISettings"
+    images: "ImageService"
 
     # NOTE: we must forward-declare any types that include invocations, since invocations can use services
-    graph_library: ItemStorageABC["LibraryGraph"]
-    graph_execution_manager: ItemStorageABC["GraphExecutionState"]
+    graph_library: "ItemStorageABC"["LibraryGraph"]
+    graph_execution_manager: "ItemStorageABC"["GraphExecutionState"]
     processor: "InvocationProcessorABC"
 
     def __init__(
         self,
-        model_manager: ModelManager,
-        events: EventServiceBase,
-        logger: Logger,
-        latents: LatentsStorageBase,
-        images: ImageService,
-        queue: InvocationQueueABC,
-        graph_library: ItemStorageABC["LibraryGraph"],
-        graph_execution_manager: ItemStorageABC["GraphExecutionState"],
+        model_manager: "ModelManager",
+        events: "EventServiceBase",
+        logger: "Logger",
+        latents: "LatentsStorageBase",
+        images: "ImageService",
+        queue: "InvocationQueueABC",
+        graph_library: "ItemStorageABC"["LibraryGraph"],
+        graph_execution_manager: "ItemStorageABC"["GraphExecutionState"],
         processor: "InvocationProcessorABC",
-        restoration: RestorationServices,
-        configuration: InvokeAISettings = None,
+        restoration: "RestorationServices",
+        configuration: "InvokeAISettings",
     ):
         self.model_manager = model_manager
         self.events = events