Function default parameters compiled to ES5.

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1210.4.39 years ago10 years agoMinified + gzip package size for es6-default-params in KB


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 esnextesnext, 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.


$ npm install es6-default-params


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


Browserify support is built in.
$ npm install es6-default-params  # install local dependency
$ browserify -t es6-default-params $file


Build Status


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)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.