Reading and writing

The store’s own API, for code outside a component. Inside one, use the hooks in In components instead - they subscribe for you.

store.set('$/services/list', services);
store.get<Service[]>('$/services/list');
store.read('$/config/timeout', 30);          // with a fallback
store.update<number>('$/counter', (n) => (n ?? 0) + 1);
store.patch('$/config', { timeout: 60 });    // shallow merge
store.patchMany({ '$/a': 1, '$/b': 2 });     // one notification pass
store.delete('$/scratch');

batch coalesces every write inside it into a single notification pass:

store.batch(() => {
  for (const service of services) store.set(`$/services/byId/${service.id}`, service);
});

Subscriptions

store.subscribe('$/services/list', (value) => {});                    // exact
store.subscribe('$/metrics', (value) => {}, { subtree: true });       // and below
store.subscribe('$/services/*/status', (value) => {});                // wildcard
store.subscribe('$/theme', fn, { immediate: true });                  // fire now too

An exact subscriber also fires when something below it changes, because a write to $/a/b does change the object at $/a.