David Khourshid

Add ability to spawn actor from any logic

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This PR adds the ability for any actor logic to spawn an actor, which is a core tenet of the actor model.

[v5] `stop()` for multiple actors

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You can now stop multiple actors in the `stop(...)` action creator: ```ts const machine = createMachine({ types: { context: {} as { actors: Array; } }, context: ({ spawn })...

[v5] Routable states

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This PR enables developers to mark states as "routes" by providing a `route` config, which is just a normal transition config without the target: ```ts const todoMachine = createMachine({ type:...

[v5] Resumable promise logic

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This PR introduces a `step(...)` wrapper to persist intermediate state in promises. The `step(name, promiseFn)` function executes the promise created by the `promiseFn` the first time, and persists its result...

we don't implement this in any of the integration packages yet - but this reminds me that we should make `input` required here when it's required _Originally posted by @Andarist...

Invariants (typestates) POC

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