How to check for isBrowser in Angular 4

by 
import { PLATFORM_ID, Inject } from '@angular/core';
import { isPlatformBrowser} from '@angular/common';
...
export class MyComponent {
...
    testBrowser: boolean;
    constructor(
        @Inject(PLATFORM_ID) platformId: string) {
            this.testBrowser = isPlatformBrowser(platformId);
            if (this.testBrowser) {
                //this is only executed on the browser
            }
    }
...

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