Function useBoundSyncExternalStore

useBoundSyncExternalStore<
    S extends { subscribe(onStoreChange: () => void): () => void },
    T,
>(
    store: S,
    getSnapshot: (store: S) => T,
): T
Like useSyncExternalStore, but for a store exposed as an object with methods rather than standalone functions. It calls store.subscribe(...) and the snapshot selector on the instance, so a normal this-centric class — whose methods are NOT pre-bound — works without the caller detaching its methods (which would strip this). The model stays a plain class; the one adaptation into useSyncExternalStore's function-value contract lives here.
Type Parameters
- S extends { subscribe(onStoreChange: () => void): () => void }
  The store type; must expose a subscribe(listener) method.
- T
  The snapshot value type.
Parameters
- store: S
- getSnapshot: (store: S) => T
Returns T

Remarks
Pass the store instance and a selector that reads the snapshot off it (s => s.getSelection()). subscribe is memoized on the store identity so it stays a stable reference across renders (a changed subscribe would resubscribe); the snapshot selector may be an inline arrow. The selector doubles as the SSR snapshot.

Contrast useOptionalSyncExternalStore, which takes pre-bound standalone functions and tolerates an absent (null) store.