diff --git a/error.js b/error.js
new file mode 100644
index 0000000..b83325b
--- /dev/null
+++ b/error.js
@@ -0,0 +1,32 @@
+import React, { useState } from 'react';
+
+function Demo(props) {
+  const [count, setCount] = useState('0');
+
+  function unusedFunc() {
+    return 'unused';
+  }
+
+  const name = props.username;
+
+  const arr = [1,2,3];
+  const list = arr.map(item => <li>{item}</li>);
+
+  const style = { color: 'red', fontWeight: 500 };
+
+  let result = value + 1;
+
+  setCount(count++);
+
+  return (
+    <div style={style}>
+      <span>Test</span>
+      {list}
+      <button onClick={() => setCount('abc')}>Click</button>
+      <p>{name}</p>
+    </div>
+    <h1>Unwrapped</h1>
+  )
+}
+
+export { Demo };
diff --git a/error.jsx b/error.jsx
new file mode 100644
index 0000000..7b3beeb
--- /dev/null
+++ b/error.jsx
@@ -0,0 +1,32 @@
+import React, { useState } from 'react';
+
+function MyComponent(props) {
+    const [count, setCount] = useState('0');
+
+    function unusedFunc() {
+        return 'unused';
+    }
+
+    const name = props.username;
+
+    const arr = [1,2,3];
+    const list = arr.map(item => <li>{item}</li>);
+
+    const style = { color: 'red', fontWeight: 500 };
+
+    let result = value + 1;
+
+    setCount(count++);
+
+    return (
+        <div style={style}>
+            <span>Test</span>
+            {list}
+            <button onClick={() => setCount('abc')}>Click</button>
+            <p>{name}</p>
+        </div>
+        <h1>Unwrapped</h1>
+    )
+}
+
+export { MyComponent };
diff --git a/error.php b/error.php
new file mode 100644
index 0000000..3b1cc4b
--- /dev/null
+++ b/error.php
@@ -0,0 +1,26 @@
+<?php
+
+use yii\base\Controller;
+
+class SiteController extends Controller {
+    function actionIndex() {
+        echo $title;
+
+        $id = $_GET['id'];
+        $user = Yii::$app->db->createCommand("SELECT * FROM user WHERE id = $id")->queryOne();
+
+        echo $user['name'];
+
+        echo '<form method="post"><input name="test"></form>';
+
+        $model = new \app\models\User();
+        $model->name = $_POST['name'];
+        $model->save();
+
+        require_once('/var/www/html/config.php');
+
+        throw new Exception('Error!');
+
+        return true;
+    }
+}
diff --git a/error.ts b/error.ts
new file mode 100644
index 0000000..241825b
--- /dev/null
+++ b/error.ts
@@ -0,0 +1,44 @@
+function add(a: number, b: number): number {
+    return a + b
+}
+
+const result = add('1', 2);
+console.log(result)
+
+let unusedVar: string;
+
+function getString(): number {
+    return "hello"
+}
+
+let neverUsed = 123;
+
+let x: any = "abc";
+let y: number = x as number;
+
+let a = 5;
+function shadow() {
+    let a = "shadowed";
+    return a;
+}
+
+function noReturnType() {
+    return true;
+}
+
+interface User {
+    name: string;
+    age: number;
+}
+const user: User = { name: "A", age: "20" };
+
+const arr: number[] = [1, "2", 3];
+
+function unreachable() {
+    return 1;
+    console.log("This will never run");
+}
+
+function useAny(a: any, b: any): any {
+    return a + b;
+}
diff --git a/error.tsx b/error.tsx
new file mode 100644
index 0000000..db9ecac
--- /dev/null
+++ b/error.tsx
@@ -0,0 +1,35 @@
+import React, { useState } from 'react';
+
+type Props = { title?: string };
+function App(props: Props) {
+    const [count, setCount] = useState<string>(0);
+
+    function unusedFunc(): string {
+        return 'unused';
+    }
+
+    const name = props.username;
+
+    const arr = [1,2,3];
+    const list = arr.map(item => <li>{item}</li>);
+
+    const style = { color: 'red', fontWeight: 500 };
+
+    let result = value + 1;
+
+    setCount(count++);
+
+    return (
+        <div style={style}>
+            <span>Hello World</span>
+            {list}
+            <button onClick={() => setCount('abc')}>Click</button>
+            <p>{name}</p>
+        </div>
+        <h1>Unwrapped</h1>
+    )
+}
+
+export { App };
+
+const unused = 123;