openFacebookApp.js

import { available } from "nativescript-appavailability";
import { isAndroid, isIOS, device, screen } from "tns-core-modules/platform";
import * as utils from "tns-core-modules/utils/utils";

export function onOpenLink(args){
    let link: LinkItem = args.view.bindingContext;

    if (link.domain == "facebook.com") {
        //FACEBOOK APP
        const fbScheme = isIOS ? "fb://" : "com.facebook.katana";
        available(fbScheme).then(available => {
            if (available) {
                if (isIOS) { 
                    openUrl(`fb://profile?id=${link.username}`);
                } else {
                    var url = `fb://facewebmodal/f?href=https://www.facebook.com/${link.username}`; 
                    openUrl(url);
                }
            } else {
                // open in the default browser
                var webLink = `https://www.facebook.com/${link.username}`;
                openUrl(webLink);
            }
        });
    } else {
        //DEFAULT ROUTE
        utils.openUrl(link.url);  
    }
}