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.changeset/nice-pugs-shout.md

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+---
+'xstate': minor
+---
+
+You can now know if an event will cause a state change by using the new `state.can(event)` method, which will return `true` if the machine will change the state when sent the `event`, or `false` otherwise:
+
+```js
+const machine = createMachine({
+  initial: 'inactive',
+  states: {
+    inactive: {
+      on: {
+        TOGGLE: 'active'
+      }
+    },
+    active: {
+      on: {
+        DO_SOMETHING: { actions: ['something'] }
+      }
+    }
+  }
+});
+
+const state = machine.initialState;
+
+state.can('TOGGLE'); // true
+state.can('DO_SOMETHING'); // false
+
+// Also takes in full event objects:
+state.can({
+  type: 'DO_SOMETHING',
+  data: 42
+}); // false
+```