babel-plugin-transform-class-properties

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

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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.
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

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

Usage

Via .babelrc (Recommended)

.babelrc
// without options
{
  "plugins": ["transform-class-properties"]
}

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

Via CLI

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

Via Node API

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