Allow updating to null

Fixes #8

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change Log
 
 ## [unreleased]
+* Fix cannot update value to null (https://github.com/substantial/updeep/issues/8)
 * Add umd distribution builds via webpack. (https://github.com/aaronjensen/updeep/issues/3)
 
 ## [0.2.2]

lib/update.js

@@ -5,7 +5,7 @@ import assign from 'lodash/object/assign';
 function resolveUpdates(updates, obj = {}) {
   return reduce(updates, (acc, value, key) => {
     let updatedValue = value;
-    if (!Array.isArray(value) && typeof value === 'object') {
+    if (!Array.isArray(value) && value !== null && typeof value === 'object') {
       updatedValue = update(value, obj[key]);
     } else if (typeof value === 'function') {
       updatedValue = value(obj[key]);

test/index.js

@@ -109,4 +109,8 @@ describe('updeep', () => {
     expect(Object.isFrozen(result)).to.be.true;
     expect(Object.isFrozen(result.foo)).to.be.true;
   });
+
+  it('assigns null values', () => {
+    expect(u({isNull: null}, {})).to.eql({isNull: null});
+  });
 });