Initial commit

.gitignore

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+node_modules
+npm-debug.log
+dist
+README.md
+package-lock.json

package.json

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+{
+  "name": "preact-shadow-root",
+  "amdName": "Shadow",
+  "version": "1.0.0",
+  "description": "Render a Preact subtree into the Shadow DOM.",
+  "source": "preact-shadow-root.js",
+  "main": "dist/preact-shadow-root.js",
+  "module": "dist/preact-shadow-root.es.js",
+  "umd:main": "dist/preact-shadow-root.umd.js",
+  "scripts": {
+    "build": "microbundle",
+    "prepare": "npm run -s build",
+    "test": "eslint src && npm run -s build"
+  },
+  "eslintConfig": {
+    "extends": "eslint-config-developit"
+  },
+  "files": [
+    "preact-shadow-root.js",
+    "dist"
+  ],
+  "keywords": [
+    "preact",
+    "component",
+    "shadow root",
+    "shadow dom"
+  ],
+  "author": "Jason Miller <jason@developit.ca>",
+  "license": "MIT",
+  "devDependencies": {
+    "eslint": "^4.6.1",
+    "eslint-config-developit": "^1.1.1",
+    "microbundle": "^0.3.1"
+  },
+  "peerDependencies": {
+    "preact": "*"
+  }
+}

preact-shadow-root.js

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+import { render } from 'preact';
+
+/* Shadow Root component */
+export default class Shadow {
+	shouldComponentUpdate(nextProps) {
+		this.update(nextProps);
+		return false;
+	}
+	componentDidMount() {
+		let parent = this.base && this.base.parentNode;
+		if (parent) {
+			this.shadow = parent.attachShadow({ mode: 'open' });
+			this.update(this.props);
+		}
+	}
+	update(props) {
+		render(props.children[0], this.shadow, this.shadow.firstChild);
+	}
+	render() {}
+}