The definition of Angular2 Component is missing

I've been working on an Angular2 app, but I'm having trouble compiling my files correctly.

I have come across some similar issues, but none of the solutions seem to be working for me.

The error I am getting in the console is:

(index):19 Error: (SystemJS) ReleasesComponent is not defined
ReferenceError: ReleasesComponent is not defined
    at eval (http://localhost:3000/app/app.component.js:21:26)
    at Object.eval (http://localhost:3000/app/app.component.js:27:2)
    at eval (http://localhost:3000/app/app.component.js:30:4)
    at eval (http://localhost:3000/app/app.component.js:31:3)
    at eval (<anonymous>)
    at Object.eval (http://localhost:3000/app/app.module.js:15:23)
    at eval (http://localhost:3000/app/app.module.js:48:4)
    at eval (http://localhost:3000/app/app.module.js:49:3)
    at eval (<anonymous>)
Evaluating http://localhost:3000/app/app.component.js
Evaluating http://localhost:3000/app/app.module.js
Evaluating http://localhost:3000/app/main.js
Error loading http://localhost:3000/app/main.js
    at eval (http://localhost:3000/app/app.component.js:21:26)
    at Object.eval (http://localhost:3000/app/app.component.js:27:2)
    at eval (http://localhost:3000/app/app.component.js:30:4)
    at eval (http://localhost:3000/app/app.component.js:31:3)
    at eval (<anonymous>)
    at Object.eval (http://localhost:3000/app/app.module.js:15:23)
    at eval (http://localhost:3000/app/app.module.js:48:4)
    at eval (http://localhost:3000/app/app.module.js:49:3)
    at eval (<anonymous>)
Evaluating http://localhost:3000/app/app.component.js
Evaluating http://localhost:3000/app/app.module.js
Evaluating http://localhost:3000/app/main.js
Error loading http://localhost:3000/app/main.js

app.module.ts

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

import { AppComponent }  from './app.component';
import { HomeComponent } from './home/home.component';
import { ReleasesComponent } from './releases/releases.component';
import { DistroComponent } from './distro/distro.component';
import { ContactsComponent } from './contacts/contacts.component';
import { routing } from './app.routes';


@NgModule({
  imports: [ 
    BrowserModule,
    FormsModule,
    HttpModule,
    JsonpModule,
    routing
  ],

  declarations: [ 
    AppComponent,
    HomeComponent,
    ReleasesComponent,
    DistroComponent,
    ContactsComponent
  ],

   bootstrap: [ AppComponent ]
 }) 
export class AppModule { }

releases.component.ts

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

@Component({
  selector: 'releases',
  templateUrl: 'app/releases/releases.component.html',
  providers: [ReleasesService]
})

export class ReleasesComponent implements OnInit {
 releases: Observable<Array<string>>;

constructor(private releasesService: ReleasesService) { 
}

ngOnInit() { 
  this.releases = this.releasesService.getReleases();
 }
}

tsconfig.json

{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": [ "es2015", "dom" ],
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
 }
}

index.html

<!DOCTYPE html>
<html>
<head>
<base href="/">
<title>PR PR PR</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="app/assets/flex.css">
<link rel="stylesheet" href="app/assets/styles.css">

<!-- 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/systemjs/dist/system.src.js"></script>

<script src="systemjs.config.js"></script>
<script>
  System.import('app').catch(function(err){ console.error(err); });
</script>
</head>

<body>
<my-app>Loading AppComponent content here ...</my-app>
</body>
</html>

app.component.ts

import { Component } from '@angular/core';
import { Http } from '@angular/http';
import { ReleasesComponent } from './releases/releases.component';
import { ReleasesService } from './releases/releases.service';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  directives: [ReleasesComponent],
  providers: [Http, ReleasesService]
})
export class AppComponent  { name = 'My name'; }

Folders structure https://i.sstatic.net/smRqP.png https://i.sstatic.net/sKoOZ.png

Answer №1

Your path name is incorrect. Please refer to the following code snippet:

import { Component } from '@angular/core';
import { Http } from '@http/client';
//updating the lines below
import { ReleasesComponent } from './app/releases/releases.component';
import { ReleasesService } from './app/releases/releases.service';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  directives: [ReleasesComponent],
  providers: [Http, ReleasesService]
})
export class AppComponent  { name = 'My name'; }

Make sure to replace these imports with the correct paths for both ReleasesComponent and ReleasesService.

Another option is to use the following approach:

import { ReleasesComponent } from './../app/releases/releases.component';
import { ReleasesService } from './../app/releases/releases.service';

Answer №2

It appears that the NgModule reference is not included. Ensure to import NgModule and FormsModule in your app.module.ts file.

import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Guide to automatically opening a webview upon launching an ionic application

After encountering difficulties opening a login page from the desktop site with webview when my ionic app launches, I decided to create a separate page named login-check.page. On this page, I included a button that successfully opens the desktop login page ...

Utilizing dependency injection within an Angular 1 TypeScript application

Seeking assistance with integrating angular-jwt with typescript in my angular1 project. The angular-jwt package was installed using the following command: typings install dt~angular-jwt --global The package is located in typings>globals>angular-jwt ...

The file path and installed npm package intellisense does not appear in VS Code until I press Ctrl + space for TypeScript

Before pressing ctrl + space, intellisense shows: click here for image description After pressing ctrl + space, intellisense displays: click here for image description Upon updating to vs code version 1.11.0 and opening my project, I encountered an issu ...

Tips for implementing a guard feature using a modal window

I am looking to implement a dialog window with yes and no responses when clicking on a router link. If the user selects 'yes', I want to pass through the canActivate guard. The issue arises when returning to the same router with the guard in pla ...

An error occurred: The property 'toUpperCase' cannot be read of an undefined Observable in an uncaught TypeError

Encountering an issue during the development of a mobile app using the ionic framework for a movie application. After finding an example on Github, I attempted to integrate certain functions and designs into my project. The problem arises with the 'S ...

Changing the Redux state within a custom hook will not trigger a re-render

I recently created a custom wrapper-hook for a Redux slice to avoid using the "{ type: x, payload: y }" syntax :p) Below is the code for the slice: // polycanvas.ts (Redux) export const polycanvas = createSlice({ name: 'polycanvas', initial ...

The error at events.js:154 was not properly handled and caused an 'error' event to be thrown

Encountered an error while creating an Angular 2 application. I followed the instructions from this link to create a sample application. Upon running npm start Received the following error, events.js:154 throw er; // Unhandled 'error' even ...

Guide on deploying Angular 9 SSR app on Internet Information Services

After upgrading my Angular 7 project to Angular 9, I successfully executed the commands "ng add @nguniversal/express-engine", “npm run build:ssr" and "npm run serve:ssr” in my local environment. The deployment to IIS on the web server created a "dist" ...

The functionality allows users to scan multiple barcodes simultaneously and will display the results on the screen once the scanning is complete and save the results for future reference

I'm currently developing a mobile barcode scanning app using Ionic 3, targeting Android and iOS devices. However, I've encountered a roadblock. Originally, the app was designed to scan and display one product barcode. Now, a new requirement has b ...

Customizing Tab Navigation in React using TypeScript Parameters

Currently, my project involves developing projects using Typescript in conjunction with the React Native library. One specific task I am working on is creating a Custom Tab Bar and the necessary parameters include state, descriptors, and navigation. When ...

The specified property is not found on the type 'DetailedHTMLProps<ImgHTMLAttributes<HTMLImageElement>, HTMLImageElement>'

Trying to display an image in React using TypeScript is proving challenging. ... <img src="(ommitted for clarity)" width="400" heigth="400"/> ... An error is being encountered: Type '{ width: string; heigth: string; }' is not assignable ...

Trouble securing an undefined value in a union type

Encountering an error with the code below that seems unexpected. TypeScript is flagging rules[name] as not being callable, which is true since it can be undefined. Even after guarding against this case, the same error persists. The issue is elaborated in t ...

What are the steps to fix errors when deploying a MEAN stack application on Heroku?

Upon building my Angular app with a Node.js API and deploying it on Heroku, I encountered an error. Despite this, the app runs smoothly with no errors when tested on my local server. Below are the logs from Heroku: C:\Users\PC>heroku logs -a= ...

Issue NG5002: Error in Parsing: ===Symbol Not Recognized

Having trouble in Angular with a micro-frontend project. When running the angular 16 project, we encountered the following error: Error NG5002: Parser Error - Unexpected token === https://i.sstatic.net/LwivL.png ...

Dealing with mistakes in an Angular service

I've been grappling with error handling in Angular. I attempted to handle errors within a service, but I'm uncertain if that's the correct approach. @Injectable({ providedIn: 'root', }) export class CaseListService { public con ...

What is the process for incorporating personalized data into an Angular route?

My typical route declaration looks like this: { path: 'datasel/:datasel', component: aComponent, resolve: { model: AWATranslationLoaderResolver }, data: { resolvedata: 'Assets', reuse: true }, } Can we include writable data ...

Verify the rendering process in the ForwardRef's render method

I have implemented the code exactly as provided in the example from https://material-ui.com/components/bottom-navigation/: // code in app.tsx: import React from 'react'; import { makeStyles } from '@material-ui/core/styles'; import Bo ...

Ensure that the string functions as the primary interface

I'm working with an interface that looks like this interface Cat { color: string, weight: number, cute: Boolean, // even though all cats are cute! } Currently, I need to accomplish something similar to this const kitten: Cat = ... Object. ...

Angular 2 - One-Stop Form Component for Creating and Modifying

Seeking advice on how to efficiently reuse my Form Component. Data Model: class Contact { id?: String; name: String; } When a new Contact is created, the id is optional in the model as it doesn't exist at that point. When editing a Contac ...

Integrating Video.js with the latest version of Angular, Angular

Looking to integrate Video.js into my Angular 6 project and retrieve the current play time and video duration. I came across the @types/video.js library but unsure of the correct way to utilize it. Any advice on how to properly implement it? ...