const luainjs = require(luainjs)
// or
import luainjs from 'luainjs'

const luaEnv = luainjs.createEnv()

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
})

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

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

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)