implemented es6 import utility function (Y.extend(module) === module(Y))

README.md

@@ -71,6 +71,19 @@ require('y-text')(Y)
 // do the same for all modules you want to use
 ```
 
+### ES6 Syntax
+```
+import Y from 'yjs'
+import yArray from 'y-array'
+import yWebsocketsClient from 'y-webrtc'
+import yMemory from 'y-memory'
+import yArray from 'y-array'
+import yMap from 'y-map'
+import yText from 'y-text'
+// ..
+Y.extend(yArray, yWebsocketsClient, yMemory, yArray, yMap, yText /*, .. */)
+```
+
 # Text editing example
 Install dependencies
 ```

src/y.js

@@ -14,6 +14,7 @@ module.exports = Y
 Y.requiringModules = requiringModules
 
 Y.extend = function (name, value) {
+  if (arguments.length === 2 && typeof name === 'string') {
     if (value instanceof Y.utils.CustomTypeDefinition) {
       Y[name] = value.parseArguments
     } else {
@@ -23,6 +24,16 @@ Y.extend = function (name, value) {
       requiringModules[name].resolve()
       delete requiringModules[name]
     }
+  } else {
+    for (var i = 0; i < arguments.length; i++) {
+      var f = arguments[i]
+      if (typeof f === 'function') {
+        f(Y)
+      } else {
+        throw new Error('Expected function!')
+      }
+    }
+  }
 }
 
 Y.requestModules = requestModules