Trace: turning on the framework's own diagnostics

@nativescript/core logs rich internals — binding failures, layout passes, navigation, native lifecycle — but only when you enable BOTH the switch and the categories:

import { Trace } from '@nativescript/core';

Trace.enable();                       // step 1 — alone this prints NOTHING
Trace.addCategories(
  Trace.categories.concat(            // step 2 — pick categories
    Trace.categories.Binding,
    'BindingError',                   // see the All caveat below
    Trace.categories.Layout,
    Trace.categories.Navigation,
  ),
);

The full category list: Accessibility, VisualTreeEvents, Layout, Style, ViewHierarchy, NativeLifecycle, Debug, Navigation, Test, Binding, BindingError, Error, Animation, Transition, Livesync, ModuleNameResolver, MediaQuery.