feat(deno): Use interface for WidgetOptions for better JSR docs (#498)

Author: manzt

.changeset/brown-jokes-yell.md

@@ -0,0 +1,5 @@
+---
+"@anywidget/deno": patch
+---
+
+Prefer interface over type for WidgetOptions

packages/deno/deno.json

@@ -29,5 +29,8 @@
 		"@std/testing": "jsr:@std/testing@0.220.1",
 		"unzipit": "npm:unzipit@1.4",
 		"zod": "npm:zod@3.9"
+	},
+	"publish": {
+		"exclude": ["npm.README.md"]
 	}
 }

packages/deno/src/mod.ts

@@ -222,20 +222,22 @@ function to_esm<State>({
 	return `${imports}\nexport default { render: ${render.toString()} }`;
 }
 
+type Awaitable<T> = T | Promise<T>;
+
 /** The options bag to pass to the {@link widget} method. */
-export type WidgetOptions<State> = {
+export interface WidgetOptions<State> {
 	/** The initial widget state. */
 	state: State;
 	/** A function that renders the widget. This function is serialized and sent to the front end. */
 	render: (context: {
 		model: FrontEndModel<State>;
 		el: HTMLElement;
-	}) => unknown;
+	}) => Awaitable<(() => Awaitable<void>) | undefined>;
 	/** The imports required for the front-end function. */
 	imports?: string;
 	/** The version of the anywidget front end to use. */
 	version?: string;
-};
+}
 
 /**
  * Creates an anywidget for the Deno Jupyter kernel.