es6-default-params

es6-default-params

Compiles JavaScript written using ES6 default function parameters to use ES5-compatible function syntax. For example, this:

function add(x=0, y=0) {
  return x + y;
}

compiles to this:

function add() {
  var x = (arguments[0] !== void 0 ? arguments[0] : 0);
  var y = (arguments[1] !== void 0 ? arguments[1] : 0);
  return x + y;
}

This project is part of esnext, a project to compile the syntax of the next version of JavaScript to today's JavaScript environments.

For more information about the proposed syntax, see the wiki page on default params.

Install

$ npm install es6-default-params

Usage

$ node
> var es6defaultParams = require('es6-default-params')
> es6defaultParams.compile(codeWithDefaultParams)
{ "code": ..., "map": ... }
> es6defaultParams.transform(anAst)
anotherAst

Browserify

Browserify support is built in.

$ npm install es6-default-params  # install local dependency
$ browserify -t es6-default-params $file

Contributing

Setup

First, install the development dependencies:

$ npm install

Then, try running the tests:

$ npm test

To run specific example files:

$ node test/runner test/examples/my-example.js test/examples/other-example.js

Pull Requests

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Any contributors to the master es6-default-params repository must sign the Individual Contributor License Agreement (CLA). It's a short form that covers our bases and makes sure you're eligible to contribute.

When you have a change you'd like to see in the master repository, send a pull request. Before we merge your request, we'll make sure you're in the list of people who have signed a CLA.