lua-in-js

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A Lua to JS transpiler/runtime. This library is a rewrite of Starlight with a lot of improvements.

Install

npm i lua-in-js

API

Import

import * as luainjs from 'lua-in-js'

const luainjs = require('lua-in-js')

Create the lua environment

Lua environments are isolated from each other (they got different global scopes)

const luaEnv = luainjs.createEnv()

A config object can be passed in for extra functionality

const luaEnv = luainjs.createEnv({
    LUA_PATH,   // default value of package.path
    fileExists, // function that takes in a path and returns a boolean
    loadFile,   // function that takes in a path and returns the content of a file
    stdin,      // string representing the standard input
    stdout,     // function representing the standard output
    osExit      // function called by os.exit
})

Execute a script or file

const luaScript = luaEnv.parse('print(\'Hello world!\')')
const returnValue = luaScript.exec()

const luaScript = luaEnv.parseFile('somefile.lua')
const returnValue = luaScript.exec()

parseFile uses config.fileExists and config.loadFile

Create a global library

Creating a global library allows you write APIs that you can use in the Lua environment.

function helloBuilder(name) {
    const NAME = luainjs.utils.coerceArgToString(name, 'sayHi', 1)
    return `Hello ${NAME}!`
}

const myLib = new luainjs.Table({ helloBuilder })
luaEnv.loadLib('myLib', myLib)

const helloStr = luaEnv.parse(`return myLib.helloBuilder('John')`).exec()
console.log(helloStr)

Check out the math lib for a more extensive example.

Example

Check out the test runner for a concrete example.

Missing functionality

• coroutine library
• debug library
• utf8 library
• io library
• package.cpath
• package.loadlib
• string.dump
• string.pack
• string.packsize
• string.unpack
• os.clock
• os.execute
• os.getenv
• os.remove
• os.rename
• os.tmpname