Merge branch 'master' of https://github.com/react-component/util

Author: zombieJ

src/Dom/shadow.ts

@@ -0,0 +1,7 @@
+export function inShadow(ele: Node) {
+  return ele?.getRootNode() !== ele?.ownerDocument;
+}
+
+export function getShadowRoot(ele: Node) {
+  return inShadow(ele) ? ele?.getRootNode() : null;
+}

tests/shadow.test.tsx

@@ -0,0 +1,23 @@
+import { getShadowRoot } from '../src/Dom/shadow';
+
+describe('shadow', () => {
+  describe('getShadowRoot', () => {
+    it('show work', () => {
+      const shadowRoot = document.createElement('div');
+      document.body.appendChild(shadowRoot);
+
+      const shadow = shadowRoot.attachShadow({ mode: 'open' });
+      const inShadowButton = document.createElement('button');
+      shadow.appendChild(inShadowButton);
+
+      expect(getShadowRoot(inShadowButton)).toBe(shadow);
+    });
+
+    it('show return null', () => {
+      const button = document.createElement('button');
+      document.body.appendChild(button);
+
+      expect(getShadowRoot(button)).toBeNull();
+    });
+  });
+});