import { PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';
 
...
constructor(public store: Store<any>,
                @Inject(PLATFORM_ID) private _platformId: object) {
        isPlatformBrowser(this._platformId);
    }
ngOnInit() {
        if (isPlatformBrowser(this._platformId)) {
            // INITIAL BROWSER CODE
        }

        if (isPlatformServer(this._platformId)) {
            console.log('server');
        }
    }