dk00/livescript-next

Enable latest ES features for LiveScript

livescript-next

Enable latest ES features for LiveScript.

Try it here

This project implements a bridge from LiveScript to modern JavaScript, by converting the LiveScript AST into Babel AST and then using the Babel toolchain to generate JS:

LS code -> LiveScript parser -> convert -> Babel AST -> Babel transform -> JS

ES modules can be used without JS code literals, use import and export instead, just like using require!:

import name, name1: alias
import module: {name0, name1: alias1}
export {name, default: name, alias: name}

import name from "name";
import alias from "name1";
import { name0, name1 as alias1 } from "module";
export { name, name as default, name as alias };

See wiki for what are added and what are going to be added.

Usage with babel in node

Install required packages:

npm i --save-dev livescript livescript-next babel-plugin-preset-stage-0 transform-es2015-modules-commonjs

Set babel options(or specify this in .babelrc):

babel-options =
  presets: <[stage-0]>
  plugins: <[transform-es2015-modules-commonjs]>
  parser-opts: parser: \livescript-next

Register require hook and require the entry file:

require \livescript
delete require.extensions\.ls
require \babel-register <| babel-options
require \./index.ls

Features

• Module
  • Named import and export
  • Export declaration
  • Import only side-effect
• ES Destructuring assignment/parameter output
  • Basic support
  • With default value
  • Spread operator
  • Named destructing
• External helper
• Async function
• Arrow function
• Class

API

• convert :: ast -> ast Convert from LiveScript AST to babel AST
• parse :: code -> ast Parse LiveScript code and convert it to babel AST
• compile :: code -> {code, map}

Require hook for node

See examples