Troubleshooting: Angular 2 component directive malfunctioning

I am new to Angular 2 and I'm trying to get my first app up and running using TypeScript. I have the app.component.ts file where I created a directive to another component called todos.component, but I'm encountering this error during compilation:

[0] app/app.component.ts(7,3): error TS2345: Argument of type '{ moduleId: string; selector: string; directives: typeof TodosComponent[]; templateUrl: string; s ...' is not assignable to parameter of type 'Component'.
[0]   Object literal may only specify known properties, and 'directives' does not exist in type 'Component'.

This is my code:

index.html

<html>
  <head>
    <title>Angular 2 QuickStart</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">
    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="node_modules/core-js/client/shim.min.js"></script>
    <script src="node_modules/zone.js/dist/zone.js"></script>
    <script src="node_modules/reflect-metadata/Reflect.js"></script>
    <script src="node_modules/systemjs/dist/system.src.js"></script>
    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>
  <body>
    <app-root>Loading...</app-root>
  </body>
</html>

app.component.ts

import { Component } from '@angular/core';
import {TodosComponent} from './todos/todos.component';

@Component({
  moduleId : module.id,
  selector: 'app-root',
  directives: [TodosComponent],
  templateUrl : 'app.component.html',
  styleUrls : ['app.component.css']
})

export class AppComponent {
    title: string = "Does it work?";
}

app.component.html:

<h1> Angular 2 application</h1>
{{title}}
<app-todos></app-todos>

todos.component.ts

import { Component, OnInit } from '@angular/core';

@Component({
  moduleId : module.id,
  selector: 'app-todos',
  template: '<h2>Todo List</h2>'
})

export class TodosComponent {
    title: string = "You have to do the following today:";    
}

The app runs smoothly without the directive. Any assistance would be greatly appreciated!

Thank you in advance!

Answer №1

If you are working with the app.component.ts, make sure to note that in RC6, the directive property has been removed from the @Component() decorator.

To resolve this issue, follow these steps:

  1. Create an NgModule.
  2. Declare the TodosComponent inside the declarations: [] array.

For a clear example, check out AppModule at the following link:

https://angular.io/docs/ts/latest/tutorial/toh-pt3.html

Answer №2

Originally, the usage of module.id was prominent during Angular 2's beta phase. However, with the introduction of new versions and Angular CLI support, the need for adding moduleId:module.id in .ts files has diminished.

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