es6-module-transpiler

    0.10.0 • Public • Published

    ES6 Module Transpiler Build Status

    ES6 Module Transpiler is an experimental compiler that allows you to write your JavaScript using a subset of the ES6 module syntax, and compile it into AMD or CommonJS modules.

    This compiler provides a way to experiment with ES6 syntax in real world scenarios to see how the syntax holds up. It also provides a nicer, more declarative way to write AMD (or CommonJS) modules.

    See the CHANGELOG for the latest updates.

    Usage

    Build tools

    The easiest way to use the transpiler is from an existing build tool. There several plugins developed for different build tools:

    Executable

    The transpiler can be used directly from the command line:

    $ npm install -g es6-module-transpiler
    $ compile-modules convert foo.js
    

    Here is the basic usage:

    compile-modules convert -I lib -o out FILE [FILE…]
    

    Library

    You can also use the transpiler as a library:

    var transpiler = require('es6-module-transpiler');
    var Container = transpiler.Container;
    var FileResolver = transpiler.FileResolver;
    var BundleFormatter = transpiler.formatters.bundle;
     
    var container = new Container({
      resolvers: [new FileResolver(['lib/'])],
      formatter: new BundleFormatter()
    });
     
    container.getModule('index');
    container.write('out/mylib.js');

    Supported ES6 Module Syntax

    Named Exports

    There are two types of exports. Named exports like the following:

    // foobar.js
    var foo = 'foo', bar = 'bar';
     
    export { foo, bar };

    This module has two named exports, foo and bar.

    You can also write this form as:

    // foobar.js
    export var foo = 'foo';
    export var bar = 'bar';

    Either way, another module can then import your exports like so:

    import { foo, bar } from 'foobar';
     
    console.log(foo);  // 'foo'

    Default Exports

    You can also export a default export. For example, an ES6ified jQuery might look like this:

    // jquery.js
    var jQuery = function() {};
     
    jQuery.prototype = {
      // ...
    };
     
    export default jQuery;

    Then, an app that uses jQuery could import it with:

    import $ from 'jquery';

    The default export of the "jquery" module is now aliased to $.

    A default export makes the most sense as a module's "main" export, like the jQuery object in jQuery. You can use default and named exports in parallel.

    Other Syntax

    import "foo";

    A "bare import" that doesn't import any identifiers is useful for executing side effects in a module. For example:

    // alerter.js
    alert("alert! alert!");
     
    // alertee.js
    import "alerter";  // will pop up alert box

    Compiled Output

    Default Exports

    This is super important:

    Default exports bind to an identifier on the module called default!

    Internally, the transpiler will use this default identifer when importing, but any outside consumer needs to be aware that it should use the default key and not the module itself. For example, a CommonJS consumer should look like this:

    var $ = require('jquery')['default'];

    Installation

    Add this project to your application's package.json by running this:

    $ npm install --save es6-module-transpiler
    

    Or install it globally:

    $ npm install -g es6-module-transpiler
    

    Acknowledgements

    Thanks to Yehuda Katz for js_module_transpiler, the library on which this one is based. Thanks to Dave Herman for his work on ES6 modules. Thanks to Erik Bryn for providing the initial push to write this library. Thanks to Domenic Denicola, Jo Liss, & Thomas Boyt for their efforts to make this project even better. And finally thanks to the JavaScript community at Square for helping to write and release this library.

    Contributing

    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-module-transpiler 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.

    Thanks, and enjoy living in the ES6 future!

    Install

    npm i es6-module-transpiler

    DownloadsWeekly Downloads

    261

    Version

    0.10.0

    License

    Apache-2.0

    Last publish

    Collaborators

    • akolyte01
    • amoghk
    • jguze-sq
    • xiao-square
    • joanc
    • square-owner
    • adrw
    • square-developers
    • matahwoosh
    • hirokiosame
    • bmishkin
    • dpapastrat
    • maxbeatty
    • linnea
    • pretzelhammer
    • alexandersmanning
    • eventualbuddha
    • tboyt