Added automatic polyfill version

Author: rubennorte

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2015-2016 Rubén Norte <[email protected]>
+Copyright (c) 2015-2017 Rubén Norte <[email protected]>
 
 MIT License
 

README.md

@@ -19,9 +19,9 @@ npm install es6-object-assign
 
 The package is also available as a UMD module (compatible with AMD, CommonJS and exposing a global variable `ObjectAssign`) in `dist/object-assign.js` and `dist/object-assign.min.js` (833 bytes minified and gzipped).
 
-## Usage
+The versions with automatic polyfilling are `dist/object-assign-auto.js` and `dist/object-assign-auto.min.js`.
 
-As a polyfill, defining Object.assign() if it is not already defined:
+## Usage
 
 **CommonJS**:
 
@@ -30,21 +30,42 @@ As a polyfill, defining Object.assign() if it is not already defined:
 require('es6-object-assign').polyfill();
 var obj = Object.assign({}, { foo: 'bar' });
 
+// Same version with automatic polyfilling
+require('es6-object-assign/auto');
+var obj = Object.assign({}, { foo: 'bar' });
+
 // Or ponyfill, using a reference to the function without modifying globals
 var assign = require('es6-object-assign').assign;
 var obj = assign({}, { foo: 'bar' });
 ```
 
 **Globals**:
 
+Manual polyfill:
+
 ```html
 <script src="<your-libs-directory>/object-assign.min.js"></script>
 <script>
   // Polyfill, modifying the global Object
   window.ObjectAssign.polyfill();
   var obj = Object.assign({}, { foo: 'bar' });
+</script>
+```
+
+Automatic polyfill:
+
+```html
+<script src="<your-libs-directory>/object-assign-auto.min.js"></script>
+<script>
+  var obj = Object.assign({}, { foo: 'bar' });
+</script>
+```
 
-  // Or ponyfill, using a reference to the function without modifying globals
+Ponyfill, without modifying globals:
+
+```html
+<script src="<your-libs-directory>/object-assign.min.js"></script>
+<script>
   var assign = window.ObjectAssign.assign;
   var obj = assign({}, { foo: 'bar' });
 </script>
@@ -54,7 +75,7 @@ var obj = assign({}, { foo: 'bar' });
 
 The MIT License (MIT)
 
-Copyright (c) 2015 Rubén Norte
+Copyright (c) 2017 Rubén Norte
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

auto.js

@@ -0,0 +1,3 @@
+'use strict';
+
+require('./index').polyfill();

dist/object-assign-auto.js

@@ -0,0 +1,54 @@
+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+'use strict';
+
+require('./index').polyfill();
+
+},{"./index":2}],2:[function(require,module,exports){
+/**
+ * Code refactored from Mozilla Developer Network:
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
+ */
+
+'use strict';
+
+function assign(target, firstSource) {
+  if (target === undefined || target === null) {
+    throw new TypeError('Cannot convert first argument to object');
+  }
+
+  var to = Object(target);
+  for (var i = 1; i < arguments.length; i++) {
+    var nextSource = arguments[i];
+    if (nextSource === undefined || nextSource === null) {
+      continue;
+    }
+
+    var keysArray = Object.keys(Object(nextSource));
+    for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
+      var nextKey = keysArray[nextIndex];
+      var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
+      if (desc !== undefined && desc.enumerable) {
+        to[nextKey] = nextSource[nextKey];
+      }
+    }
+  }
+  return to;
+}
+
+function polyfill() {
+  if (!Object.assign) {
+    Object.defineProperty(Object, 'assign', {
+      enumerable: false,
+      configurable: true,
+      writable: true,
+      value: assign
+    });
+  }
+}
+
+module.exports = {
+  assign: assign,
+  polyfill: polyfill
+};
+
+},{}]},{},[1]);

dist/object-assign-auto.min.js

@@ -2,10 +2,14 @@
   "name": "es6-object-assign",
   "version": "1.0.3",
   "description": "ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill",
-  "main": "src/index.js",
+  "main": "index.js",
   "scripts": {
-    "compile": "browserify src/index.js -o dist/object-assign.js --standalone ObjectAssign",
-    "compress": "uglifyjs dist/object-assign.js --compress --mangle > dist/object-assign.min.js",
+    "compile": "npm run compile:manual && npm run compile:auto",
+    "compile:manual": "browserify index.js -o dist/object-assign.js --standalone ObjectAssign",
+    "compile:auto": "browserify auto.js -o dist/object-assign-auto.js",
+    "compress": "npm run compress:manual && npm run compress:auto",
+    "compress:manual": "uglifyjs dist/object-assign.js --compress --mangle > dist/object-assign.min.js",
+    "compress:auto": "uglifyjs dist/object-assign-auto.js --compress --mangle > dist/object-assign-auto.min.js",
     "build": "npm run compile && npm run compress"
   },
   "repository": {
@@ -33,7 +37,8 @@
     "uglify-js": "^2.4.21"
   },
   "files": [
-    "src",
+    "index.js",
+    "auto.js",
     "dist"
   ]
 }