Bypass loop if there are no listeners

Author: markerikson

packages/action-listener-middleware/src/index.ts

@@ -247,6 +247,9 @@ export function createActionListenerMiddleware<
     }
 
     let stateBefore = api.getState()
+    if (listenerMap.size === 0) {
+      return next(action)
+    }
 
     let result: unknown
     for (const currentPhase of actualMiddlewarePhases) {
@@ -276,7 +279,6 @@ export function createActionListenerMiddleware<
         return result
       }
     }
-    return next(action)
   }
 
   type Unsubscribe = () => void

packages/action-listener-middleware/src/tests/listenerMiddleware.test.ts

@@ -69,6 +69,12 @@ describe('createActionListenerMiddleware', () => {
     expect(foundExtra).toBe(originalExtra)
   })
 
+  test('Passes through if there are no listeners', () => {
+    const originalAction = testAction1('a')
+    const resultAction = store.dispatch(originalAction)
+    expect(resultAction).toBe(originalAction)
+  })
+
   test('directly subscribing', () => {
     const listener = jest.fn((_: TestAction1) => {})