From e875b471aa2b1ed9262dc823ccdb7f9e876d5e22 Mon Sep 17 00:00:00 2001
From: Tim Cheung <tim@cheung.io>
Date: Tue, 6 Sep 2016 11:06:12 +0200
Subject: [PATCH 1/2] Omit payload on undefined only

---
 src/__tests__/createAction-test.js | 3 ++-
 src/createAction.js                | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/__tests__/createAction-test.js b/src/__tests__/createAction-test.js
index 1265dd9a..22332534 100644
--- a/src/__tests__/createAction-test.js
+++ b/src/__tests__/createAction-test.js
@@ -95,7 +95,8 @@ describe('createAction()', () => {
 
       const explictNullAction = createAction(type)(null);
       expect(explictNullAction).to.deep.equal({
-        type
+        type,
+        payload: null
       });
 
       const baz = '1';
diff --git a/src/createAction.js b/src/createAction.js
index 5a4eab5b..e6e706de 100644
--- a/src/createAction.js
+++ b/src/createAction.js
@@ -1,4 +1,5 @@
 import identity from 'lodash/identity';
+import isUndefined from 'lodash/isUndefined';
 
 export default function createAction(type, payloadCreator, metaCreator) {
   const finalPayloadCreator = typeof payloadCreator === 'function'
@@ -13,7 +14,7 @@ export default function createAction(type, payloadCreator, metaCreator) {
     };
 
     const payload = hasError ? args[0] : finalPayloadCreator(...args);
-    if (!(payload === null || payload === undefined)) {
+    if (!isUndefined(payload)) {
       action.payload = payload;
     }
 

From fbfcab1b78e538742830cd8408e210ecbc44a782 Mon Sep 17 00:00:00 2001
From: Tim Cheung <tim@cheung.io>
Date: Tue, 27 Sep 2016 11:57:24 +0200
Subject: [PATCH 2/2] remove obsolete test

---
 src/__tests__/createAction-test.js | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/src/__tests__/createAction-test.js b/src/__tests__/createAction-test.js
index 22332534..bce3cc54 100644
--- a/src/__tests__/createAction-test.js
+++ b/src/__tests__/createAction-test.js
@@ -93,12 +93,6 @@ describe('createAction()', () => {
         type
       });
 
-      const explictNullAction = createAction(type)(null);
-      expect(explictNullAction).to.deep.equal({
-        type,
-        payload: null
-      });
-
       const baz = '1';
       const actionCreator = createAction(type, null, () => ({ bar: baz }));
       expect(actionCreator()).to.deep.equal({