Class extends value undefined is not a constructor or null using library in Angular 7

[drenda]

Hi,
I'm trying to use the library into my Angular 7 project.

I created a service like this:

import {Injectable} from '@angular/core';
const AmiClient = require('asterisk-ami-client');

@Injectable()
export class AsteriskPbxService {
  client = new AmiClient();

  constructor() {
  }

  start(){
    this.client.connect('manager', 'xxxxxxx', {host: 'localhost', port: 5038})
        .then(amiConnection => {

          this.client
              .on('connect', () => console.log('connect'))
              .on('event', event => console.log(event))
              .on('data', chunk => console.log(chunk))
              .on('response', response => console.log(response))
              .on('disconnect', () => console.log('disconnect'))
              .on('reconnection', () => console.log('reconnection'))
              .on('internalError', error => console.log(error))
              .action({
                Action: 'Ping'
              });

          setTimeout(() => {
            this.client.disconnect();
          }, 5000);

        })
        .catch(error => console.log(error));
  }

  
  destroy() {
  if(this.client){
     this.client.disconnect();
   }
  }
}

I added it to my providers. Unfortunately when the project starts I've this error:

AmiEventsStream.js:16 Uncaught TypeError: Class extends value undefined is not a constructor or null
    at Object../node_modules/asterisk-ami-events-stream/lib/AmiEventsStream.js (AmiEventsStream.js:16)
    at __webpack_require__ (bootstrap:83)
    at Object../node_modules/asterisk-ami-connector/lib/AmiConnection.js (AmiConnection.js:10)
    at __webpack_require__ (bootstrap:83)
    at Object../node_modules/asterisk-ami-connector/lib/index.js (index.js:11)
    at __webpack_require__ (bootstrap:83)
    at Object../node_modules/asterisk-ami-client/lib/AmiClient.js (AmiClient.js:10)
    at __webpack_require__ (bootstrap:83)
    at Module../src/app/_service/pbx/asteriskPbx.service.ts (asteriskPbx.service.ts:2)
    at __webpack_require__ (bootstrap:83)

Am I doing something wrong? Do I need something to make the library work in Angular 7?
Thanks