import { Component, InjectionToken, Input } from "@angular/core";

const BOUND_COMPONENT = new InjectionToken<any>("BoundComponent");

export function Bind() {
  return function(target: any) {
    console.log("Bound", target);
  };
}

@Bind()
@Component({
  selector: "hello",
  template: `
    <h1>Hello {{ name }}!</h1>
  `,
  providers: [{ provide: BOUND_COMPONENT, useExisting: HelloComponent }],
  styles: [
    `
      h1 {
        font-family: Lato;
      }
    `
  ]
})
export class HelloComponent {
  @Input() name: string;
}

will give an runtime error as you can see in stackblitz

Error in /~/src/app/hello.component.ts
HelloComponent_1 is not defined

ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 10.0.8
Node: 12.18.4
OS: win32 x64

Angular: 10.0.5
... animations, common, compiler, compiler-cli, core, forms
... router
Ivy Workspace: 

Package                             Version
-------------------------------------------------------------
@angular-devkit/architect           0.1000.8
@angular-devkit/build-angular       0.1000.8
@angular-devkit/build-ng-packagr    0.1000.8
@angular-devkit/build-optimizer     0.1000.8
@angular-devkit/build-webpack       0.1000.8
@angular-devkit/core                10.0.8
@angular-devkit/schematics          10.0.8
@angular/cdk                        10.1.0
@angular/cli                        10.0.8
@angular/flex-layout                10.0.0-beta.32
@angular/http                       8.0.0-beta.10
@angular/language-service           10.2.0
@angular/localize                   10.2.0
@angular/material                   10.1.0
@angular/material-moment-adapter    10.1.0
@angular/platform-browser           10.2.0
@angular/platform-browser-dynamic   10.2.0
@angular/upgrade                    10.0.14
@ngtools/webpack                    10.0.8
@schematics/angular                 10.0.8
@schematics/update                  0.1000.8
ng-packagr                          10.1.2
rxjs                                6.6.0
typescript                          3.9.7
webpack                             4.43.0