isPlatformWorkerApp( platformId );

import { Component, Inject } from '@angular/core';
import { PLATFORM_ID } from '@angular/core';
import { isPlatformWorkerUi } from '@angular/common';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
    isWorker: boolean;
    
    constructor( @Inject(PLATFORM_ID) platformId: Object) {
      this.isWorker = isPlatformWorkerUi(platformId);
      console.log(this.isWorker);
    }
  }

import { Component, Inject } from '@angular/core';
import { PLATFORM_ID } from '@angular/core';
import { isPlatformWorkerUi } from '@angular/common';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
    isWorker: boolean;
    
    constructor( @Inject(PLATFORM_ID) platformId: Object) {
      this.isWorker = isPlatformWorkerUi(platformId);
    }
  }

<div *ngIf = 'isWorker==false'>
      platform id does not represents a web worker UI platform.
</div>