yieldify

yieldify

Transpiler for ES6 to ES5 with no runtime component. The design goals of this project are:

• Use the esprima parser rather than writing a custom parser. Using the harmony branch gives pretty good support, and if it turns out to be lacking, it can be patched.
• Produce output code that is as readable as possible.
• Produce output code that is as performant as the input code where possible.

Non goals include:

• Performance of the conversion, unless it gets unreasonably slow.
• Supporting features that can be "polyfilled"
• Supporting the entirety of ES6

In short, this gives you those helpful syntactic shortcuts without the bloat that often acompanies transpilers.

Features supported

• template strings I am a ${"template"} string
• classes class Dog extends Animal { constructor() { super('Dog') }}
• arrow functions var squares = [1, 2, 3, 4].map(x => x * x)

Ironically not yield a this stage :(

Installation

npm install yieldify

CLI

To compile from the CLI you can use a number of methods:

$ yieldify input.js > output.js
$ yieldify < input.js > output.js
$ yieldify input.js output.js
$ yieldify input.js | uglify-js --minify > output.js

You can also compile an entire directory

$ yieldify input output

API

Individual files:

var compile = require('yieldify')

fs.writeFileSync('output.js', compile('input.js', fs.readFileSync('input.js', 'utf8')))

Entire direcotries:

var compile = require('yieldify')

compile.folder(input, output)

License

MIT