I haven't touched JS in a while and see that there is a lot of use of the @ sign in node.js servers.
E.G.
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { AngularFireModule } from '@angular/fire';
import { environment } from '../environments/environment';
What do the @ signs mean? or if its for formatting, why is it set as that?