[IMP] add support for top level comments

src/blockdom/index.ts

@@ -4,7 +4,7 @@ export { toggler } from "./toggler";
 export { createBlock } from "./block_compiler";
 export { list } from "./list";
 export { multi } from "./multi";
-export { text } from "./text";
+export { text, comment } from "./text";
 export { html } from "./html";
 
 export interface VNode<T = any> {

src/blockdom/text.ts

@@ -8,18 +8,17 @@ const nodeInsertBefore = nodeProto.insertBefore;
 const characterDataSetData = getDescriptor(characterDataProto, "data").set!;
 const nodeRemoveChild = nodeProto.removeChild;
 
-class VText {
+abstract class VSimpleNode {
   text: string;
   parentEl?: HTMLElement | undefined;
-  el?: Text;
+  el?: any;
 
   constructor(text: string) {
     this.text = text;
   }
 
-  mount(parent: HTMLElement, afterNode: Node | null) {
+  mountNode(node: Node, parent: HTMLElement, afterNode: Node | null) {
     this.parentEl = parent;
-    const node = document.createTextNode(toText(this.text));
     nodeInsertBefore.call(parent, node, afterNode);
     this.el = node;
   }
@@ -29,14 +28,6 @@ class VText {
     nodeInsertBefore.call(this.parentEl, this.el!, target);
   }
 
-  patch(other: VText) {
-    const text2 = other.text;
-    if (this.text !== text2) {
-      characterDataSetData.call(this.el!, toText(text2));
-      this.text = text2;
-    }
-  }
-
   beforeRemove() {}
 
   remove() {
@@ -52,10 +43,36 @@ class VText {
   }
 }
 
+class VText extends VSimpleNode {
+  mount(parent: HTMLElement, afterNode: Node | null) {
+    this.mountNode(document.createTextNode(toText(this.text)), parent, afterNode);
+  }
+
+  patch(other: VText) {
+    const text2 = other.text;
+    if (this.text !== text2) {
+      characterDataSetData.call(this.el!, toText(text2));
+      this.text = text2;
+    }
+  }
+}
+
+class VComment extends VSimpleNode {
+  mount(parent: HTMLElement, afterNode: Node | null) {
+    this.mountNode(document.createComment(toText(this.text)), parent, afterNode);
+  }
+
+  patch() {}
+}
+
 export function text(str: string): VNode<VText> {
   return new VText(str);
 }
 
+export function comment(str: string): VNode<VComment> {
+  return new VComment(str);
+}
+
 export function toText(value: any): string {
   switch (typeof value) {
     case "string":