The Angular 5 application is encountering an error as it is unable to interpret the property 'apply' due to being

I encountered a peculiar issue with my Angular 5 app. Everything runs smoothly in test mode when using the ng serve command locally. However, upon deploying the application in production mode with the ng build --prod command, an unforeseen problem arises when accessing the app in a live environment as shown by these browser console screenshots from Google Chrome and Safari:

Google Chrome Console:

https://i.sstatic.net/dSeK1.png

Safari Console:

https://i.sstatic.net/OPUaV.png

Let's delve into the component associated with the mentioned error:

user-online-quote.component.html

<app-navbar [loggedIn]=loggedIn></app-navbar>
<app-dynamic-form [answers$]="answers$"></app-dynamic-form>

user-online-quote.component.ts

import { Component, OnInit } from '@angular/core';
import { DynamicFormService } from '../_services/dynamic-form.service';
import { RadioQuestion }  from '../shared/_shared/answer-radio';
import { Observable } from "rxjs/Rx";
import { AuthService } from '../_services/auth.service';
... (truncated for brevity) ...
@Component({
  selector: 'app-user-online-quote',
  templateUrl: './user-online-quote.component.html',
  styleUrls: ['./user-online-quote.component.css'],
  providers:  [DynamicFormService]
})
export class UserOnlineQuoteComponent implements OnInit {
  totalPage:number;
  actualPage:number;
  percentageCompletion:number;
  ... (more details omitted) ...
}

dinamic-form.component.html

<div class="space"></div>
<ngx-loading [show]="loading" [config]="{ backdropBorderRadius: '0px', fullScreenBackdrop:true }"></ngx-loading>
... (omitted code snippet) ...

dinamic-form.component.ts

import { Component, Input, OnInit, ChangeDetectorRef }  from '@angular/core';
import { FormGroup }                 from '@angular/forms';
import { AnswerBase }              from '../shared/_shared/answer-base';
import { AnswerControlService }    from '../_services/answer-control.service';
... (continue with truncated content)...

package.json

{
  "name": "front-end",
  ... (other dependencies listed) ...
}

The anomalous occurrence of this error only post-exporting the application raises curiosity. It comes as a surprise, especially considering no errors or warnings appear during the export process completion. Any suggestions on deciphering this strange behavior?

javascriptangulartypescript

Answer №1

It's possible that your code may not be compatible with AOT. You can test this by running ng build --prod --aot false to see if it resolves the issue, or try ng serve --aot to check for any errors.

Answer №2

When you compile your application in production mode (ng bull --prod), it thoroughly checks for any mistakes in your code. To avoid encountering this issue, you can take one of the following two steps.

  1. Ensure that when you define the object containing the 'apply' property, it is initialized with a value corresponding to its variable type.
  2. Prior to using the 'apply' property in your code, verify if it is undefined or null.

The first step may solve the problem during compilation time. However, if the issue persists during runtime, you should proceed with the second step.

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