Troubleshooting TypeScript issues in an Angular 4 tutorial demo

I recently started working on the Angular tutorial provided on the official website. However, I have encountered an issue that I am struggling to resolve.

After using Angular CLI to create the project, I came across the following code in app.component.ts:

import { Component } from '@angular/core';
import {Hero} from './hero';

const HEROES: Hero[] = [
  { id: 11, name: 'Mr. Nice' },
  { id: 12, name: 'Narco' },
  { id: 13, name: 'Bombasto' },
  { id: 14, name: 'Celeritas' },
  { id: 15, name: 'Magneta' },
  { id: 16, name: 'RubberMan' },
  { id: 17, name: 'Dynama' },
  { id: 18, name: 'Dr IQ' },
  { id: 19, name: 'Magma' },
  { id: 20, name: 'Tornado' }
];

@Component({
  selector: 'app-my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'app';
  selectedHero: Hero;
  heroes = HEROES;
  onSelect(hero: Hero): void {
    this.selectedHero = hero;
  }
}

This is the structure of the project files:

https://i.sstatic.net/1341b.png

When attempting to launch the application, I encountered the following TypeScript error:

Failed to compile.

/Users/name/Documents/workspaces/angular-tutorial1/firstapp/src/app/hero-detail.component.ts (3,12): Argument of type '{ selector: number; templateUrl: string; }' is not assignable to parameter of type 'Component'. Types of property 'selector' are incompatible. Type 'number' is not assignable to type 'string'.

Answer №1

Do you know if app-component.html contains a line that looks like this?

<app-hero-detail [hero]="selectedHero"></app-hero-detail> 

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