# babel-plugin-transform-class-properties

> This plugin transforms static class properties as well as properties declared with the property initializer syntax

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

## Install

```sh
npm install babel-plugin-transform-class-properties
pnpm add babel-plugin-transform-class-properties
yarn add babel-plugin-transform-class-properties
bun add babel-plugin-transform-class-properties
```

## 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 | 4 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 43993 |
| Maintainers | amasad, hzoo, jmm, loganfsmyth, sebmck, thejameskyle |
| Keywords | babel-plugin |

## Links

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

## Dependencies (4)

- [babel-runtime](https://npm.io/package/babel-runtime.md) ^6.22.0
- [babel-template](https://npm.io/package/babel-template.md) ^6.24.1
- [babel-helper-function-name](https://npm.io/package/babel-helper-function-name.md) ^6.24.1
- [babel-plugin-syntax-class-properties](https://npm.io/package/babel-plugin-syntax-class-properties.md) ^6.8.0

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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
- … 33 more at https://npm.io/package/babel-plugin-transform-class-properties/versions

## README

# babel-plugin-transform-class-properties

> This plugin transforms es2015 static class properties as well as properties declared with the es2016 property initializer syntax.

## Example

Below is a class with four class properties which will be transformed.

```js
  class Bork {
    //Property initializer syntax
    instanceProperty = "bork";
    boundFunction = () => {
      return this.instanceProperty;
    }

    //Static class properties
    static staticProperty = "babelIsCool";
    static staticFunction = function() {
      return Bork.staticProperty;
    }
  }

  let myBork = new Bork;

  //Property initializers are not on the prototype.
  console.log(myBork.prototype.boundFunction); // > undefined

  //Bound functions are bound to the class instance.
  console.log(myBork.boundFunction.call(undefined)); // > "bork"

  //Static function exists on the class.
  console.log(Bork.staticFunction()); // > "babelIsCool"
```


## Installation

```sh
npm install --save-dev babel-plugin-transform-class-properties
```

## Usage

### Via `.babelrc` (Recommended)

**.babelrc**

```json
// without options
{
  "plugins": ["transform-class-properties"]
}

// with options
{
  "plugins": [
    ["transform-class-properties", { "spec": true }]
  ]
}
```

### Via CLI

```sh
babel --plugins transform-class-properties script.js
```

### Via Node API

```javascript
require("babel-core").transform("code", {
  plugins: ["transform-class-properties"]
});
```

## Options

### `spec`

`boolean`, defaults to `false`.

Class properties are compiled to use `Object.defineProperty`. Static fields are now defined even if they are not initialized.

## References

* [Proposal: ES Class Fields & Static Properties](https://github.com/jeffmo/es-class-static-properties-and-fields)

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