Reactivity in Depth

Signals are getter/setter pairs. Effects subscribe to signals and store properties read while they run, update those dependencies on subsequent runs, and can be stopped. Notifications are batched during one signal/store update. computed() is an effect-backed getter.

The optional sprig-framework/store add-on's createStore() recursively wraps plain objects and arrays. Reads, key enumeration, and presence checks are tracked; writes, deletion, and array mutators notify subscribers. Class instances, Map, and Set are not recursively proxied. Roots and effect runs own cleanup callbacks; see Reactivity Fundamentals for examples.