1npm install ngx-toastr --save
2npm install @angular/animations --save
3
4// angular.json
5"styles": [
6  "styles.scss",
7  "node_modules/ngx-toastr/toastr.css" // try adding '../' if you're 
8  										// using angular cli before 6
9]
10
11// app.module
12import { CommonModule } from '@angular/common';
13import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
14import { ToastrModule } from 'ngx-toastr';
15
16imports: [
17    CommonModule,
18    BrowserAnimationsModule, // required animations module
19    ToastrModule.forRoot(), // ToastrModule added
20  ],
21  
22// component
23import { ToastrService } from 'ngx-toastr';
24
25constructor(private toastr: ToastrService) {}
26
27showSuccess() {
28  this.toastr.success('Hello world!', 'Toastr fun!');
29}

1npm install ngx-toastr --save