Split src/environment.js into Node/browser versions

src/environment_browser.js:
  Use global variables instead of requiring modules. This undoes the effects of
  the following commits, removing ~1KB from the bundle size:
    51003e3: Timers: require('timers') instead of directly using global
    8baf989: LoggerFactory: require('console') instead of directly using global
    b69fef8: Utils.Promise = global.Promise || require('promiscuous');

src/environment.js:
  Export a Node-compatible environment by extending the browser environment
  with the modules listed above.

Gruntfile.js: Tests polyfill Promise using promiscuous-browser.js

Gruntfile.js

@@ -48,7 +48,7 @@ module.exports = function(grunt) {
     },
     browserify: {
       devel: {
-        src: 'src/index.js',
+        src: pkg.main,
         dest: 'dist/<%= name %>-<%= pkg.version %>.js'
       },
       options: {
@@ -98,6 +98,7 @@ module.exports = function(grunt) {
         options: {
           specs: 'test/spec/*.js',
           keepRunner : true,
+          vendor: 'test/polyfills/*.js',
           helpers: 'test/helpers/*.js'
         }
       }

package.json

@@ -6,8 +6,7 @@
   "main": "src/index.js",
   "browser": {
     "./src/Grammar/index.js": "./src/Grammar/dist/Grammar.js",
-    "promiscuous": "./src/polyfills/promiscuous.js",
-    "console": "./src/polyfills/console.js"
+    "./src/environment.js": "./src/environment_browser.js"
   },
   "homepage": "http://sipjs.com",
   "author": "Will Mitchell <[email protected]>",

src/environment.js

@@ -1,31 +1,9 @@
-function getPrefixedProperty (object, name) {
-  if (object == null) {
-    return;
-  }
-  var capitalizedName = name.charAt(0).toUpperCase() + name.slice(1);
-  var prefixedNames = [name, 'webkit' + capitalizedName, 'moz' + capitalizedName];
-  for (var i in prefixedNames) {
-    var property = object[prefixedNames[i]];
-    if (property) {
-      return property.bind(object);
-    }
-  }
-}
+var extend = require('util')._extend;
 
-module.exports = {
-  WebSocket: global.WebSocket,
-  open: global.open,
+extend(exports, require('./environment_browser'));
+
+extend(exports, {
   Promise: global.Promise || require('promiscuous'),
   console: require('console'),
-  timers: require('timers'),
-
-  MediaStream: getPrefixedProperty(global, 'MediaStream'),
-  getUserMedia: getPrefixedProperty(global.navigator, 'getUserMedia'),
-  RTCPeerConnection: getPrefixedProperty(global, 'RTCPeerConnection'),
-  RTCSessionDescription: getPrefixedProperty(global, 'RTCSessionDescription'),
-
-  attachMediaStream: global.attachMediaStream,
-  // these aren't prefixed, but some platforms don't have global.URL
-  createObjectURL: getPrefixedProperty(global.URL, 'createObjectURL'),
-  revokeObjectURL: getPrefixedProperty(global.URL, 'revokeObjectURL')
-};
+  timers: require('timers')
+});

src/environment_browser.js

@@ -0,0 +1,37 @@
+function getPrefixedProperty (object, name) {
+  if (object == null) {
+    return;
+  }
+  var capitalizedName = name.charAt(0).toUpperCase() + name.slice(1);
+  var prefixedNames = [name, 'webkit' + capitalizedName, 'moz' + capitalizedName];
+  for (var i in prefixedNames) {
+    var property = object[prefixedNames[i]];
+    if (property) {
+      return property.bind(object);
+    }
+  }
+}
+
+module.exports = {
+  WebSocket: global.WebSocket,
+  open: global.open,
+  Promise: global.Promise,
+  timers: global,
+
+  // Console is not defined in ECMAScript, so just in case...
+  console: global.console || {
+    debug: function () {},
+    log: function () {},
+    warn: function () {},
+    error: function () {}
+  },
+
+  MediaStream: getPrefixedProperty(global, 'MediaStream'),
+  getUserMedia: getPrefixedProperty(global.navigator, 'getUserMedia'),
+  RTCPeerConnection: getPrefixedProperty(global, 'RTCPeerConnection'),
+  RTCSessionDescription: getPrefixedProperty(global, 'RTCSessionDescription'),
+
+  attachMediaStream: global.attachMediaStream,
+  createObjectURL: global.URL && global.URL.createObjectURL,
+  revokeObjectURL: global.URL && global.URL.revokeObjectURL
+};