node-binance-api: unable to run any method

I’m just trying to get this up and running, but done of the example works.

i get the following:

const publicRequest = function(url, data, callback, method = "GET") {
	                                                           ^

SyntaxError: Unexpected token =
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:387:25)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Module.require (module.js:367:17)
    at require (internal/module.js:16:19)
    at Object.<anonymous> (/Users/chungtinhlakho/Desktop/thaison/ct/app.js:4:17)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)