Node: SerialPort is not a constructor - node.js

Question

I'm trying to connect to my Raspberry pi's serialport via node but when i run the js file it comes up with this error:
var serialport = new SerialPort("/dev/ttyAMA0", {
^
TypeError: SerialPort is not a constructor
at Object.<anonymous> (/home/pi/exploringrpi/chp13/xbee/nodejs/test.js:12:18)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Function.Module.runMain (module.js:693:10)
at startup (bootstrap_node.js:191:16)
at bootstrap_node.js:612:3
node is at version 8.11.4
serialport is at version 7.0.2
This is the code:
// From the example code at www.npmjs.com/package/xbee-api
var util = require('util');
var SerialPort = require('serialport').SerialPort;
var xbee_api = require('xbee-api');
var C = xbee_api.constants;
var xbeeAPI = new xbee_api.XBeeAPI({
api_mode: 1
});
var serialport = new SerialPort("/dev/ttyAMA0", {
baudRate: 115200});
serialport.on("open", function() {
var frame_obj = { // AT Request to be sent to
type: C.FRAME_TYPE.AT_COMMAND, // Prepare for an AT command
command: "NI", // Node identifer command
commandParameter: [], // No parameters needed
};
serialport.write(xbeeAPI.buildFrame(frame_obj));
});
// The data frames are outputted by this function
xbeeAPI.on("frame_object", function(frame) {
console.log(">>", frame);
});
Hope you can help

Answer 1

You should probably remove the .SerialPort at the end of the require line:
var SerialPort = require('serialport').SerialPort;
The serial port documentation shows how it should be used, and it doesn't include that .SerialPort at the end:
var SerialPort = require('serialport');
var port = new SerialPort('/dev/ttyAMA0', {
baudRate: /dev/ttyAMA0
});

Answer 2

Another error was shown to me:
throw new TypeError("path" is not defined: ${settings.path});
I created the port object like this:
const sp = new SerialPort("/dev/ttyACM0", {baudRate: 4800});
It was wrong way.
Try to create port and define the path inside curl brackets:
const sp = new SerialPort({path: "/dev/ttyACM0", baudRate: 4800});
const SerialPort = require('serialport').SerialPort;
const sp = new SerialPort({path: "/dev/ttyACM0", baudRate: 4800});
const sent_data = '\x45';
sp.on("open", function() {
console.log("port has opened");
sp.write(sent_data, function(err){
if(err){
return console.log('Error on write', err.message);
}
console.log('Port.write: ', sent_data);
});
});
sp.on('data', function(data){
// decoding uint8Array to string
var enc = new TextDecoder();
var arr = new Uint8Array(data);
ready = enc.decode(arr)
console.log('Data received: ', ready);
});
// Read data that is available but keep the stream from entering "flowing mode"
sp.on('readable', function () {
console.log('Data2:', sp.read());
});