fix(runtime): dom functions in circular dependency

packages/runtime/dom/dom.ts

@@ -1,5 +1,96 @@
 import { VNode } from "../v-dom";
-import { createElement, updateElement } from "./elements";
+import { camelToDash } from "../utils/others";
+
+/**
+ * Create a dom node according to the tag name of the vnode.
+ *
+ * 1. Create a dom node according to the tag name of the vnode.
+ * 2. Set the attributes of the dom node.
+ * 3. Create the child nodes of the dom node.
+ *
+ * @param node the vnode
+ */
+export function createElement(node: VNode): Node {
+	// create a dom node according to the tag name of the vnode
+	const el =
+		node.tagName === "Fragment"
+			? document.createDocumentFragment()
+			: document.createElement(node.tagName);
+
+	// set the attributes of the dom node
+	const attributes = node.attributes;
+	for (const key in attributes) {
+		if (key.startsWith("on")) {
+			const eventName = key.slice(2).toLowerCase();
+			el.addEventListener(eventName, attributes[key]);
+		} else {
+			node.tagName === "Fragment"
+				? null
+				: // @ts-ignore
+				  el.setAttribute(camelToDash(key), attributes[key]);
+		}
+	}
+
+	// create the child nodes of the dom node
+	if (node.children) {
+		for (const child of node.children) {
+			if (typeof child === "string") {
+				el.appendChild(document.createTextNode(child));
+				continue;
+			}
+			el.appendChild(createElement(child));
+		}
+	}
+	return el;
+}
+
+/**
+ * Update the attributes of the dom node.
+ *
+ * 1. Get the dom node of the vnode.
+ * 2. Get the attributes of the vnode.
+ * 3. Update the attributes of the dom node.
+ * 4. Update the child nodes of the dom node.
+ *
+ * @param node the vnode
+ */
+export function updateElement(oldNode: VNode, newNode: VNode) {
+	// get the dom node of the vnode
+	const el = newNode.el! as HTMLElement;
+
+	// get the attributes of the vnode
+	const attributes = newNode.attributes;
+
+	// update the attributes of the dom node
+	for (const key in attributes) {
+		if (key.startsWith("on")) {
+			if (typeof oldNode?.attributes[key] === "function") {
+				const eventName = key.slice(2).toLowerCase();
+				el.removeEventListener(eventName, oldNode.attributes[key]);
+				el.addEventListener(eventName, attributes[key]);
+			}
+		} else {
+			el.setAttribute(camelToDash(key), attributes[key]);
+		}
+	}
+
+	for (const child of newNode.children) {
+		if (typeof child === "string") {
+			el.appendChild(document.createTextNode(child));
+			continue;
+		}
+		el.appendChild(createElement(child));
+	}
+
+	// update the child nodes of the dom node
+	if (newNode.children) {
+		for (const child of Object.values(newNode.children)) {
+			updateDOM(undefined, child);
+		}
+	}
+
+	return el;
+}
 
 /**
  * Update the dom tree.

packages/runtime/dom/index.ts

@@ -1,3 +1,2 @@
 export * from "./attrs";
 export * from "./dom";
-export * from "./elements";

packages/runtime/v-dom/patch.ts

@@ -1,5 +1,6 @@
+import { createElement } from "../dom";
 import { updateAttributes } from "../dom/attrs";
-import { createElement } from "../dom/elements";
+
 import { VNode } from "./vnode";
 
 export function patch(host: Node, vnode: VNode, old: VNode, index: number) {