# babel-plugin-transform-es2015-classes

> Compile ES2015 classes to ES5

Latest version **6.24.1** (published 2017-04-07) · MIT license · 0 weekly downloads

## Install

```sh
npm install babel-plugin-transform-es2015-classes
pnpm add babel-plugin-transform-es2015-classes
yarn add babel-plugin-transform-es2015-classes
bun add babel-plugin-transform-es2015-classes
```

## Health

**Score 35/100 (D)** — status: abandoned.

Positive: no vulnerabilities; high maintenance score; popular repo.

Warnings: low downloads; no types; no esm support.

Negative: abandoned.

## Facts

| | |
|---|---|
| Version | 6.24.1 |
| Published | 2017-04-07 |
| First published | 2015-10-29 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 9 |
| Known vulnerabilities | 0 (+1 in 1 direct dependencies) |
| Install scripts | no |
| GitHub stars | 43990 |
| Maintainers | amasad, hzoo, jmm, loganfsmyth, sebmck, thejameskyle |
| Keywords | babel-plugin |

## Links

- npm: https://www.npmjs.com/package/babel-plugin-transform-es2015-classes
- Repository: https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-es2015-classes
- npm.io page: https://npm.io/package/babel-plugin-transform-es2015-classes

## Dependencies (9)

- [babel-types](https://npm.io/package/babel-types.md) ^6.24.1
- [babel-runtime](https://npm.io/package/babel-runtime.md) ^6.22.0
- [babel-messages](https://npm.io/package/babel-messages.md) ^6.23.0
- [babel-template](https://npm.io/package/babel-template.md) ^6.24.1
- [babel-traverse](https://npm.io/package/babel-traverse.md) ^6.24.1
- [babel-helper-define-map](https://npm.io/package/babel-helper-define-map.md) ^6.24.1
- [babel-helper-function-name](https://npm.io/package/babel-helper-function-name.md) ^6.24.1
- [babel-helper-replace-supers](https://npm.io/package/babel-helper-replace-supers.md) ^6.24.1
- [babel-helper-optimise-call-expression](https://npm.io/package/babel-helper-optimise-call-expression.md) ^6.24.1

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## Recent versions

- 6.24.1 (latest) — 2017-04-07
- 7.0.0-beta.3 (next) — 2017-10-15
- 7.0.0-beta.2 — 2017-09-26
- 7.0.0-beta.1 — 2017-09-19
- 7.0.0-beta.0 — 2017-09-12
- 7.0.0-alpha.20 — 2017-08-30
- 7.0.0-alpha.19 — 2017-08-07
- 7.0.0-alpha.18 — 2017-08-03
- 7.0.0-alpha.17 — 2017-07-26
- 7.0.0-alpha.16 — 2017-07-25
- 7.0.0-alpha.15 — 2017-07-12
- 7.0.0-alpha.14 — 2017-07-12
- 7.0.0-alpha.12 — 2017-05-31
- 7.0.0-alpha.11 — 2017-05-31
- 7.0.0-alpha.10 — 2017-05-25
- … 38 more at https://npm.io/package/babel-plugin-transform-es2015-classes/versions

## README

# babel-plugin-transform-es2015-classes

> Compile ES2015 classes to ES5

## Caveats

Built-in classes such as `Date`, `Array`, `DOM` etc cannot be properly subclassed
due to limitations in ES5 (for the [es2015-classes](http://babeljs.io/docs/plugins/transform-es2015-classes) plugin).
You can try to use [babel-plugin-transform-builtin-extend](https://github.com/loganfsmyth/babel-plugin-transform-builtin-extend) based on `Object.setPrototypeOf` and `Reflect.construct`, but it also has some limitations.

## Installation

```sh
npm install --save-dev babel-plugin-transform-es2015-classes
```

## Usage

### Via `.babelrc` (Recommended)

**.babelrc**

```js
// without options
{
  "plugins": ["transform-es2015-classes"]
}

// with options
{
  "plugins": [
    ["transform-es2015-classes", {
      "loose": true
    }]
  ]
}
```

### Via CLI

```sh
babel --plugins transform-es2015-classes script.js
```

### Via Node API

```javascript
require("babel-core").transform("code", {
  plugins: ["transform-es2015-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.

---
_Source: https://npm.io/package/babel-plugin-transform-es2015-classes · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._