Google Cloud Functions Datastore Emulator local connection with functions -

i've launched local datastore emulatior , although wrote , test gcf remote datastore instance (not emulated one). i'm trying use locally launched datastore instance testing puprposes, requests still going cloud instance of datastore.

here code.

const db = require("@google-cloud/datastore")();  exports.signup = (req, res) => {     if(!req.body.firstname || !req.body.lastname || !req.body.email) {         res.status(400).send("incorrect user data passed");     } else {         let key = db.key("user");         console.log("key: ", key);         db.insert({             key: key,             data: {                 firsname: req.body.firsname,                 lastname: req.body.lastname,                 email: req.body.email             }         }, (err, apiresponse) => {             console.log(apiresponse);             if(err) {                 res.status(400).json({                     message: "error occured during creation"                 });             } else {                 res.status(200).json({                     message: `created under ${apiresponse}`                 });             }         });     } }; 

i know apiendpoint (link on documentation) parameter in datastore instance configuration object. should passed explicitly in code? though there should environment variable tell default configuration search datastore emulator first, , try use cloud one.