Fixed an issue with state.tags not having correct values when resol…

…ving micro transitions (#3166)

.changeset/bright-humans-admire.md

@@ -0,0 +1,5 @@
+---
+'xstate': patch
+---
+
+Fixed an issue with `state.tags` not having correct values when resolving micro transitions (taken in response to raised events). This was creating issues when checking tags in guards.

packages/core/src/StateNode.ts

@@ -1341,7 +1341,7 @@ class StateNode<
       transitions: stateTransition.transitions,
       children,
       done: isDone,
-      tags: currentState?.tags,
+      tags: getTagsFromConfiguration(resolvedConfiguration),
       machine: this as any
     });
 
@@ -1415,10 +1415,6 @@ class StateNode<
     // Preserve original history after raised events
     maybeNextState.history = history;
 
-    maybeNextState.tags = getTagsFromConfiguration(
-      maybeNextState.configuration
-    );
-
     return maybeNextState;
   }
 

packages/core/test/guards.test.ts

@@ -1,4 +1,4 @@
-import { Machine, interpret } from '../src';
+import { Machine, interpret, createMachine, actions } from '../src';
 
 describe('guard conditions', () => {
   type LightMachineCtx = {
@@ -227,6 +227,36 @@ describe('guard conditions', () => {
       B: 'B4'
     });
   });
+
+  it('should be able to check source state tags when checking', () => {
+    const machine = createMachine({
+      initial: 'a',
+      states: {
+        a: {
+          on: {
+            MACRO: 'b'
+          }
+        },
+        b: {
+          entry: actions.raise('MICRO'),
+          tags: 'theTag',
+          on: {
+            MICRO: {
+              cond: (_ctx: any, _event: any, { state }: any) =>
+                state.hasTag('theTag'),
+              target: 'c'
+            }
+          }
+        },
+        c: {}
+      }
+    });
+
+    const service = interpret(machine).start();
+    service.send('MACRO');
+
+    expect(service.state.value).toBe('c');
+  });
 });
 
 describe('custom guards', () => {