implemented module loader for yjs

src/y.js

@@ -1,11 +1,68 @@
 /* @flow */
 'use strict'
 
+require('./Connector.js')(Y)
+require('./Database.js')(Y)
+require('./Transaction.js')(Y)
+require('./Struct.js')(Y)
+require('./Utils.js')(Y)
+require('./Databases/RedBlackTree.js')(Y)
+require('./Databases/Memory.js')(Y)
+require('./Databases/IndexedDB.js')(Y)
+require('./Connectors/Test.js')(Y)
+
+var requiringModules = {}
+
+module.exports = Y
+
+Y.extend = function (name, value) {
+  Y[name] = value
+  var resolves = requiringModules[name]
+  if (requiringModules[name] != null) {
+    for (var i = 0; i < resolves.length; i++) {
+      resolves[i]()
+    }
+    delete requiringModules[name]
+  }
+}
+
+require('./Types/Array.js')(Y)
+require('./Types/Map.js')(Y)
+require('./Types/TextBind.js')(Y)
+
 function Y (opts) {
-  return new Promise(function (resolve) {
-    var yconfig = new YConfig(opts, function () {
-      yconfig.db.whenUserIdSet(function () {
-        resolve(yconfig)
+  opts.types = opts.types != null ? opts.types : []
+  var modules = [opts.db.name, opts.connector.name].concat(opts.types)
+  var promises = []
+  for (var i = 0; i < modules.length; i++) {
+    if (Y[modules[i]] == null) {
+      try {
+        require(modules[i])(Y)
+      } catch (e) {
+        // module does not exist
+        if (window != null) {
+          if (requiringModules[modules[i]] == null) {
+            var imported = document.createElement('script')
+            var name = modules[i].toLowerCase()
+            imported.src = opts.sourceDir + '/y-' + name + '/y-' + name + '.js'
+            document.head.appendChild(imported)
+            requiringModules[modules[i]] = []
+          }
+          promises.push(new Promise(function (resolve) {
+            requiringModules[modules[i]].push(resolve)
+          }))
+        } else {
+          throw e
+        }
+      }
+    }
+  }
+  return Promise.all(promises).then(function () {
+    return new Promise(function (resolve) {
+      var yconfig = new YConfig(opts, function () {
+        yconfig.db.whenUserIdSet(function () {
+          resolve(yconfig)
+        })
       })
     })
   })
@@ -49,9 +106,3 @@ class YConfig {
 if (typeof window !== 'undefined') {
   window.Y = Y
 }
-
-if (typeof YConcurrency_TestingMode !== 'undefined') {
-  g.Y = Y //eslint-disable-line
-  // debugger //eslint-disable-line
-}
-Y.utils = {}