Fix bug where text, props diffs were not exposed

Author: wooorm

index.js

@@ -46,7 +46,7 @@ function walk(left, right, patch, index) {
 
 function diffText(apply, left, right) {
   return left.value === right.value ?
-    undefined :
+    apply :
     append(apply, {type: 'text', left: left, right: right});
 }
 
@@ -84,7 +84,7 @@ function diffChildren(apply, left, right, patch, offset) {
 
 function diffProperties(apply, left, right) {
   var diff = diffObjects(left, right);
-  return diff ? append(apply, {type: 'props', left: left, right: diff}) : undefined;
+  return diff ? append(apply, {type: 'props', left: left, right: diff}) : apply;
 }
 
 function diffObjects(left, right) {

test.js

@@ -54,7 +54,7 @@ test('unist-diff', function (t) {
   });
 
   t.test('`props`', function (st) {
-    st.plan(11);
+    st.plan(12);
 
     (function () {
       var alpha = {type: 'alpha'};
@@ -68,6 +68,24 @@ test('unist-diff', function (t) {
       );
     })();
 
+    (function () {
+      var left = {type: 'alpha', bravo: true, value: 'charlie'};
+      var right = {type: 'alpha', bravo: false, value: 'charlie'};
+
+      st.deepEqual(
+        diff(left, right),
+        {
+          0: {
+            type: 'props',
+            left: left,
+            right: {bravo: false}
+          },
+          left: left
+        },
+        'should not return a patch for changed primitives'
+      );
+    })();
+
     (function () {
       var alpha = {type: 'alpha'};
       var left = {type: 'bravo', charlie: [1, 2, 3], children: [alpha]};