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+# @babel/plugin-transform-classes
+
+> Compile ES2015 classes to ES5
+
+## Caveats
+
+When extending a native class (e.g., `class extends Array {}`), the super class
+needs to be wrapped. This is needed to workaround two problems:
+- Babel transpiles classes using `SuperClass.apply(/* ... */)`, but native
+  classes aren't callable and thus throw in this case.
+- Some built-in functions (like `Array`) always return a new object. Instead of
+  returning it, Babel should treat it as the new `this`.
+
+The wrapper works on IE11 and every other browser with `Object.setPrototypeOf` or `__proto__` as fallback.
+There is **NO IE <= 10 support**. If you need IE <= 10 it's recommended that you don't extend natives.
+
+## Examples
+
+**In**
+
+```javascript
+class Test {
+  constructor(name) {
+    this.name = name;
+  }
+
+  logger () {
+    console.log("Hello", this.name);
+  }
+}
+```
+
+**Out**
+
+```javascript
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var Test = function () {
+  function Test(name) {
+    _classCallCheck(this, Test);
+
+    this.name = name;
+  }
+
+  Test.prototype.logger = function logger() {
+    console.log("Hello", this.name);
+  };
+
+  return Test;
+}();
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-transform-classes
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```js
+// without options
+{
+  "plugins": ["@babel/plugin-transform-classes"]
+}
+
+// with options
+{
+  "plugins": [
+    ["@babel/plugin-transform-classes", {
+      "loose": true
+    }]
+  ]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-transform-classes script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/plugin-transform-classes"]
+});
+```
+
+## Options
+
+### `loose`
+
+`boolean`, defaults to `false`.
+
+#### Method enumerability
+
+Please note that in loose mode class methods **are** enumerable. This is not in line
+with the spec and you may run into issues.
+
+#### Method assignment
+
+Under loose mode, methods are defined on the class prototype with simple assignments
+instead of being defined. This can result in the following not working:
+
+```javascript
+class Foo {
+  set bar() {
+    throw new Error("foo!");
+  }
+}
+
+class Bar extends Foo {
+  bar() {
+    // will throw an error when this method is defined
+  }
+}
+```
+
+When `Bar.prototype.foo` is defined it triggers the setter on `Foo`. This is a
+case that is very unlikely to appear in production code however it's something
+to keep in mind.