Observe outside React

import { createHingeObserver } from 'react-native-hinges';

// Obtain this root's tag from RootTagContext or the native host.
const observer = createHingeObserver(rootTag);
const unsubscribe = observer.subscribe(() => {
  console.log(observer.get());
});
console.log(observer.get());

// Release when no longer needed.
unsubscribe();

Creation seeds the snapshot from the native cache; get() synchronously reads the JS-owned snapshot. Returned arrays and entries are immutable, and equivalent snapshots retain their identity. Before a native reading is available it returns [].

subscribe() starts observation for the selected root, which triggers a native replay of the current snapshot as an event; later updates also arrive with the native change event. Callbacks receive no arguments; read get() for the current value. Multiple subscriptions on this observer share one native subscription; separate observers are reference-counted natively. Unsubscribing the final consumer releases native observation and clears its native cache. The observer keeps its last delivered snapshot after unsubscribing.

Creating an observer or calling get() alone does not start native observation. Subscribe when readings must remain current. No process-wide root is selected implicitly.