move stuff around until it feels right

library/embed/embed-child.ts

@@ -0,0 +1,6 @@
+import { Node } from "../node.js"
+import type { EmbedOptions } from "./embed-options"
+
+export abstract class EmbedChildNode<Props> extends Node<Props> {
+  abstract modifyEmbedOptions(options: EmbedOptions): void
+}