Add changeset

.changeset/neat-boxes-float.md

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+---
+'xstate': minor
+---
+
+All spawned and invoked actors now have a `.getSnapshot()` method, which allows you to retrieve the latest value emitted from that actor. That value may be `undefined` if no value has been emitted yet.
+
+```js
+const machine = createMachine({
+  context: {
+    promiseRef: null
+  },
+  initial: 'pending',
+  states: {
+    pending: {
+      entry: assign({
+        promiseRef: () => spawn(fetch(/* ... */), 'some-promise')
+      })
+    }
+  }
+});
+
+const service = interpret(machine)
+  .onTransition((state) => {
+    // Read promise value synchronously
+    const resolvedValue = state.context.promiseRef?.getSnapshot();
+    // => undefined (if promise not resolved yet)
+    // => { ... } (resolved data)
+  })
+  .start();
+
+// ...
+```