The module 'AppModule' has encountered an unexpected declaration of 'AnyComponent'

Question

The module 'AppModule' has encountered an unexpected declaration of 'AnyComponent'

Hi there, I'm currently working with Angular2 and am facing an issue when trying to use two classes in the same Typescript file.

During compile time, no errors are shown. However, when attempting to run the page, the console.log displays the following error:

Error: BaseException@http://www.my.app/panel-module/node_modules/@angular/compiler//bundles/compiler.umd.js:5116:27
    CompileMetadataResolver</CompileMetadataResolver.prototype.getNgModuleMetadata/<@http://www.my.app/panel-module/node_modules/@angular/compiler//bundles/compiler.umd.js:13274:35
    ...

Below is the content of my component's typescript file.

// MyComponent.ts

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

@Component({
  selector: 'my-app',
  templateUrl: '/path/to/view',
})

export class MyObject {
  id: number;
}

export class MyComponent {
   obj: MyObject;

   // additional code here
}

angular typescript

Answer 1

Answer №1

To avoid any issues with having multiple classes in the same file, be sure to rearrange the order of your classes accordingly. In this scenario, the @Component decorator is inadvertently applied to the wrong class MyObject, when it should actually be used for MyComponent!

Remember that the @Component decorator must directly precede the Component definition!

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

export class MyObject1 {
  id: number;
}

@Component({
  selector: 'my-app',
  templateUrl: '/path/to/view',
})
export class MyComponent {
   obj: MyObject;

   // unnecessary code
}

export class MyObject2 {
  id: number;
}

Answer 2

To avoid any issues with having multiple classes in the same file, be sure to rearrange the order of your classes accordingly. In this scenario, the @Component decorator is inadvertently applied to the wrong class MyObject, when it should actually be used for MyComponent!

Remember that the @Component decorator must directly precede the Component definition!

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

export class MyObject1 {
  id: number;
}

@Component({
  selector: 'my-app',
  templateUrl: '/path/to/view',
})
export class MyComponent {
   obj: MyObject;

   // unnecessary code
}

export class MyObject2 {
  id: number;
}

Answer 3

Answer №2

Here is the solution that worked for me:

I placed MyObject in its own file and imported it.

// MyObject.ts

export class MyObject {
  id: number;
}

// MyComponent.ts

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

@Component({
  selector: 'my-app',
  templateUrl: '/path/to/view',
})

export class MyComponent {
   obj: MyObject;

   // unnecessary code
}

Answer 4

Here is the solution that worked for me:

I placed MyObject in its own file and imported it.

// MyObject.ts

export class MyObject {
  id: number;
}

// MyComponent.ts

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

@Component({
  selector: 'my-app',
  templateUrl: '/path/to/view',
})

export class MyComponent {
   obj: MyObject;

   // unnecessary code
}

Answer 5

Answer №3

Just a heads up, in my situation I had to tweak some JavaScript logic where it couldn't be.

<my-tag [HTML]="sourcesHtml ? sourcesHtml[i] : ''">

After changing it to

<my-tag [HTML]="sourcesHtml[i]">

The error disappeared

Answer 6

Just a heads up, in my situation I had to tweak some JavaScript logic where it couldn't be.

<my-tag [HTML]="sourcesHtml ? sourcesHtml[i] : ''">

After changing it to

<my-tag [HTML]="sourcesHtml[i]">

The error disappeared

The module 'AppModule' has encountered an unexpected declaration of 'AnyComponent'

Answer №1

Answer №2

Answer №3

Similar questions

The deno bundle operation failed due to the absence of the 'getIterator' property on the type 'ReadableStream<R>'

Upgrading to Angular 2: Utilizing ElementRef in ES5

Securing Your Subscription Key in Azure API Management

Who is responsible for ensuring that the data has been successfully stored in the state?

Tips for showcasing information from a nested array and modifying data in an Angular application

Calculating the annual total in angular 4 - a step-by-step guide

Encountered an error: When trying to install styled-components using npm, there was an issue reading properties of null, specifically 'edgesOut'

How can a callback function be connected to a specific route within an Angular routing module?

Is it possible to showcase a variety of values in mat-select?

Encountering difficulties with Bootstrap toggle functionality in Angular 2.0 following the establishment of a MEAN stack

Using Iframe for WooCommerce integration and implementing Facebook login within an Ionic application

Transferring data from two child components back to the parent component

A multidimensional array featuring a variety of data types in TypeScript

Implementing `block eval() in Content Security Policy header for an Angular 8 project

Ways to indicate a mat-checkbox as selected in Angular 7

Tips for storing information without using ngModel in template-driven methodology

How to retrieve information from JSON files utilizing arrays

Obtaining data from a Nested Json file in Angular 5

The use of credentials is not allowed when the ‘Access-Control-Allow-Origin’ CORS header is set to ‘*’

Declaring a function in TypeScript triggers an error notification