move stuff around until it feels right

library/text.ts

@@ -0,0 +1,8 @@
+import type { MessageOptions } from "./message"
+import { Node } from "./node.js"
+
+export class TextNode extends Node<string> {
+  override modifyMessageOptions(options: MessageOptions) {
+    options.content = (options.content ?? "") + this.props
+  }
+}