https://www.npmjs.com/package/ng-select2
u angular.json sam makao iz teme skripte
"scripts": [
              "src/assets/js/custom-maps.js",
              "src/assets/js/dashboard.js"
prije updatea angular cli, na ovim verzijama mi je radio angular za backend
@angular-devkit/architect       0.1202.15
@angular-devkit/build-angular   12.2.15
@angular-devkit/core            12.2.15
@angular-devkit/schematics      12.2.15
@angular/cli                    12.2.15
@schematics/angular             12.2.15
rxjs                            6.6.7
typescript                      4.3.5




Angular CLI: 12.2.11
Node: 16.13.2 (Unsupported)
Package Manager: npm 8.1.2
OS: win32 x64

Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1202.11 (cli-only)
@angular-devkit/core         12.2.11 (cli-only)
@angular-devkit/schematics   12.2.11 (cli-only)
@schematics/angular          12.2.11 (cli-only)

https://www.npmjs.com/package/@ng-select/ng-select