1. Very first, you need to below command into your Angular 9 application:

npm install select2
 npm install jquery --save

2. Now you need to add below code into your angular.json file:

 "styles": [
       "node_modules/select2/dist/css/select2.min.css",
              ...
          ],
"scripts": [
       "node_modules/jquery/dist/jquery.min.js", 
       "node_modules/select2/dist/js/select2.min.js"
              ...
      ]

3. Now you need to add below code into your app.module.ts file:

...
import { HttpClientModule } from '@angular/common/http';
...
imports: [

  HttpClientModule,
  ...
  ],

#angular 8 #angular 9 #laravel 7 #laravel 7.2 #laravel