Read and write APIs

readOnly and writeOnly exist for code that should not create a framework subscription.

readOnly()

readOnly() synchronously reads from the underlying store. You can pass a selector.

const current = useCounter.readOnly();
const count = useCounter.readOnly((state) => state.count);

Use it in event handlers, router guards, one-off effects, or tests. It does not make a component reactive.

writeOnly()

writeOnly() returns the writer without subscribing. In plain state it writes next state; in reducer state it dispatches actions.

const setCounter = useCounter.writeOnly();
setCounter((state) => ({ count: state.count + 1 }));

subscribe

Angular exposes subscribe in its result and adapter object. Svelte exposes subscribe as the standard Svelte store method. Other adapters subscribe internally for reactive reads.

Caveat

Do not call reactive adapter functions outside their lifecycle owner just to read current state. Use readOnly() instead; Vue, Solid, and Angular intentionally throw helpful lifecycle errors for that case.