Global tablet CSS for NativeScript apps

nativescript-global-tablet-specific-styles.ts

import { NgModule } from "@angular/core";
import { DeviceType } from "ui/enums";
import { device } from "platform";
import * as application from "application";

const fs = require("file-system");

@NgModule({
  // ..
})

export class AppModule {
  constructor() {
    if (device.deviceType === DeviceType.Tablet) {
      let cssFileName = fs.path.join(fs.knownFolders.currentApp().path, "app.tablet.css");
      fs.File.fromPath(cssFileName).readText().then((result: string) => {
        application.addCss(result);
      });
    }
  }
}