feat(anywidget): expose model.widget_manager (#194)

Author: manzt

.changeset/selfish-dryers-flow.md

@@ -0,0 +1,6 @@
+---
+"anywidget": patch
+"@anywidget/types": patch
+---
+
+feat: expose the `IWidgetManager` from `@jupyter-widgets/base` to render function.

packages/anywidget/src/widget.js

@@ -118,6 +118,7 @@ function extract_context(view) {
 		off(name, callback) {
 			view.model.off(name, callback, view);
 		},
+		widget_manager: view.model.widget_manager,
 	};
 	return { model, el: view.el };
 }

packages/types/index.d.ts

@@ -1,3 +1,5 @@
+import type { IWidgetManager } from "@jupyter-widgets/base";
+
 type Awaitable<T> = T | Promise<T>;
 type ObjectHash = Record<string, any>;
 type ChangeEventHandler<Payload> = (_: unknown, value: Payload) => void;
@@ -39,6 +41,7 @@ export interface AnyModel<T extends ObjectHash = ObjectHash> {
 		callbacks?: any,
 		buffers?: ArrayBuffer[] | ArrayBufferView[],
 	): void;
+	widget_manager: IWidgetManager;
 }
 
 export interface RenderContext<T extends ObjectHash = ObjectHash> {