an optional function that will be called when the node is registered in a realm. Can be used to create subscriptions and define relationships to other nodes. Any referred nodes will be registered in the realm automatically.
const foo$ = Action((r) => {
r.sub(foo$, () => console.log('foo action'))
})
const r = new Realm()
r.pub(foo$)
An action is just a signal with void value. It can be used to trigger side effects.
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Defines a new stateless, valueless node and returns a reference to it. Once a realm instance publishes or subscribes to the node, an instance of that node it will be registered in the realm.