Issues with the Injector arise during the Angular 2 RC5 to RC6 migration

After smoothly running my Angular2 RC5 application, I decided to upgrade to RC6. However, upon doing so, my application ceased functioning and displayed the following error message:

Error: Can't resolve all parameters for LoginComponent: (?, ?).

My Angular2 setup is fairly standard. Below is the code snippet for the LoginComponent, with each injected parameter in the constructor being annotated with @Injectable().

import {AuthService} from "../../auth/auth-service";

import {ActivatedRoute, Router} from "@angular/router";
import {Component, Inject, OnInit} from '@angular/core';

@Component({
  selector: 'login-component',
  templateUrl: 'login/login.html',
  styleUrls: ['login/login.css']
})
export class LoginComponent {
    private model = {login: '', password: ''};

    constructor(private authService: AuthService, private router: Router) {
    }

    protected doLogin(event: Event) {
        this.authService.login(this.model.login, this.model.password).then(() => {
            this.router.navigate(['/landing']);
        });
    }
}

Below is the app-module:

import {NgModule} from '@angular/core';
import {HttpModule} from '@angular/http';
import {BrowserModule} from '@angular/platform-browser';
import {FormsModule} from '@angular/forms';

import {AppService} from './app-service'
import {AuthService} from "./auth/auth-service";
import {RouterModule} from '@angular/router';
import {AppComponent} from "./component/app-component";
import {ChessComponent} from './component/chess/chess-component';
import {LoginComponent} from "./component/login/login-component";
import {LandingComponent} from "./component/landing/landing-component";
import {AuthGuardService} from "./auth/auth-guard-service";
import {GuidService} from "./shared/guid-service";
import {EchoService} from "./io/echo-service";
import {PermissionsService} from "./permissions-service";
import {
    EnumerateSetValuesPipe, EnumerateMapPipe, EnumerateMapKeysPipe, EnumerateMapValuesPipe,
    EnumerateObjectPipe, EnumerateObjectKeysPipe, EnumerateObjectValuesPipe,
    NeighbouringValuesPipe
} from "./shared/pipes";

import { TinyComponent } from "./component/tiny/tiny";
import {HtmlService} from "./component/docs/html-service";
import {DocsComponent} from "./component/docs/docs-component";

@NgModule({
    imports: [
        HttpModule,
        FormsModule,
        BrowserModule,
        RouterModule.forRoot([{
            path: '',
            redirectTo: '/landing',
            pathMatch: 'full'
        }, {
            path: 'login',
            component: LoginComponent
        }, {
            path: 'docs',
            component: DocsComponent,
            canActivate: [AuthGuardService]
        }, {
            path: 'chess',
            component: ChessComponent,
            canActivate: [AuthGuardService]
        }, {
            path: 'landing',
            component: LandingComponent,
        }])
    ],
    providers: [
        AppService,
        AuthService,
        GuidService,
        EchoService,
        HtmlService,
        AuthGuardService,
        PermissionsService
    ],
    declarations: [
        AppComponent,
        TinyComponent,
        ChessComponent,
        LoginComponent,
        LandingComponent,

        EnumerateSetValuesPipe,
        EnumerateMapPipe,
        EnumerateMapKeysPipe,
        EnumerateMapValuesPipe,
        EnumerateObjectPipe,
        EnumerateObjectKeysPipe,
        EnumerateObjectValuesPipe,
        NeighbouringValuesPipe
    ],
    bootstrap: [
        AppComponent
    ]
})
export class AppModule {
    public constructor() {

    }
}

I'm unsure how to troubleshoot this issue. Any insights or suggestions?

Answer №1

Encountering a similar issue with one of my components prompted me to investigate further. Interestingly, while the same component functions without errors in another application, it seems that the error stems from how it is implemented or connected through modules.

Coincidentally, I observed that a similar error occurs when the source file for the component is not properly loaded (incorrect file path).

Answer №2

The issue arose from the declaration of @Injector, it seems to have previously worked despite being declared as @Injectable instead of @Injectable().

Using @Injectable to decorate your class resulted in a misunderstanding of the decorator.

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