Include object.assign polyfill to work on all Node versions.

Author: beefancohen

package.json

@@ -38,5 +38,8 @@
   "engines": {
     "node": ">=0.10.0"
   },
-  "license": "MIT"
+  "license": "MIT",
+  "dependencies": {
+    "object-assign": "^4.0.1"
+  }
 }

src/util/values/expressions/index.js

@@ -1,3 +1,4 @@
+import assign from 'object-assign';
 import Literal from '../Literal';
 import Identifier from './Identifier';
 import TemplateLiteral from './TemplateLiteral';
@@ -22,7 +23,7 @@ const TYPES = {
 
 const noop = () => null;
 
-const LITERAL_TYPES = Object.assign({}, TYPES, {
+const LITERAL_TYPES = assign({}, TYPES, {
   Identifier: value => {
     const isUndefined = TYPES.Identifier(value) === undefined;
     return isUndefined ? undefined : null;

src/util/values/index.js

@@ -1,3 +1,4 @@
+import assign from 'object-assign';
 import Literal from './Literal';
 import JSXElement from './JSXElement';
 import JSXExpressionContainer from './expressions';
@@ -9,7 +10,7 @@ const TYPES = {
   JSXExpressionContainer
 };
 
-const LITERAL_TYPES = Object.assign({}, TYPES, {
+const LITERAL_TYPES = assign({}, TYPES, {
   JSXElement: () => null,
   JSXExpressionContainer: extractLiteral
 });