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!:

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

`js
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):

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

Register require hook and require the entry file:

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

Features

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