implemented module loader for yjs

gulpfile.helper.js

@@ -21,31 +21,10 @@ module.exports = function (gulp, helperOptions) {
     options.regenerator = false
     // TODO: include './node_modules/gulp-babel/node_modules/babel-core/node_modules/regenerator/runtime.js'
   }
-  var concatOrder = [
-    'y.js',
-    'Connector.js',
-    'Database.js',
-    'Transaction.js',
-    'Struct.js',
-    'Utils.js',
-    'Databases/RedBlackTree.js',
-    'Databases/Memory.js',
-    'Databases/IndexedDB.js',
-    'Connectors/Test.js',
-    'Types/Array.js',
-    'Types/Map.js',
-    'Types/TextBind.js'
-  ]
-  var yjsfiles = concatOrder.map(function (f) {
-    return '../yjs/src/' + f
-  })
   var files = {
-    dist: helperOptions.polyfills.concat(helperOptions.files.map(function (f) {
+    dist: helperOptions.entry,
-      return 'src/' + f
+    specs: helperOptions.specs,
-    })),
+    src: './src/**/*.js'
-    test: ['../yjs/src/Helper.spec.js'].concat(yjsfiles).concat(helperOptions.files.map(function (f) {
-      return 'src/' + f
-    }).concat(['src/' + options.testfiles]))
   }
 
   var babelOptions = {
@@ -54,38 +33,10 @@ module.exports = function (gulp, helperOptions) {
     experimental: true
   }
   if (options.regenerator) {
-    files.test = helperOptions.polyfills.concat(files.test)
+    files.specs = helperOptions.polyfills.concat(files.specs)
   } else {
     babelOptions.blacklist = 'regenerator'
   }
-  // babelOptions.blacklist = 'regenerator'
-
-  gulp.task('dist', ['build:dist'], function () {
-    function createDist (pipe) {
-      return pipe
-        .pipe($.if(options.debug, $.sourcemaps.init({loadMaps: true})))
-        .pipe($.concat(options.targetName))
-        .pipe($.if(!options.debug && options.regenerator, $.uglify()))
-        .pipe($.if(options.debug, $.sourcemaps.write('.')))
-        .pipe(gulp.dest('./dist/'))
-    }
-    var pipe
-    if (options.browserify || true) {
-      var browserify = require('browserify')
-      var source = require('vinyl-source-stream')
-      var buffer = require('vinyl-buffer')
-
-      pipe = browserify({
-        entries: 'build/' + options.targetName,
-        debug: options.debug
-      }).bundle()
-        .pipe(source(options.targetName))
-        .pipe(buffer())
-    } else {
-      pipe = gulp.src('build/' + options.targetName)
-    }
-    return createDist(pipe)
-  })
 
   gulp.task('dist', function () {
     var browserify = require('browserify')
@@ -99,7 +50,7 @@ module.exports = function (gulp, helperOptions) {
       .pipe(source(options.targetName))
       .pipe(buffer())
       .pipe($.if(options.debug, $.sourcemaps.init({loadMaps: true})))
-      .pipe($.concat(options.targetName))
+      .pipe($.if(!options.debug && options.regenerator, $.babel(babelOptions)))
       .pipe($.if(!options.debug && options.regenerator, $.uglify()))
       .pipe($.if(options.debug, $.sourcemaps.write('.')))
       .pipe(gulp.dest('./dist/'))
@@ -108,11 +59,46 @@ module.exports = function (gulp, helperOptions) {
   gulp.task('watch:dist', function (cb) {
     options.debug = true
     runSequence('dist', function () {
-      gulp.watch(files.dist, ['dist'])
+      gulp.watch(files.src, ['dist'])
       cb()
     })
   })
 
+  gulp.task('dev:node', ['test'], function () {
+    gulp.watch(files.src, ['test'])
+  })
+
+  gulp.task('spec-build', function () {
+    var browserify = require('browserify')
+    var source = require('vinyl-source-stream')
+    var buffer = require('vinyl-buffer')
+
+    return browserify({
+      entries: files.specs,
+      debug: options.debug
+    }).bundle()
+      .pipe(source('specs.js'))
+      .pipe(buffer())
+      .pipe($.sourcemaps.init({loadMaps: true}))
+      .pipe($.sourcemaps.write())
+      .pipe(gulp.dest('./build/'))
+  })
+
+  gulp.task('dev:browser', ['spec-build'], function () {
+    gulp.watch(files.src, ['spec-build'])
+    return gulp.src('./build/specs.js')
+      .pipe($.jasmineBrowser.specRunner())
+      .pipe($.jasmineBrowser.server({port: options.testport}))
+  })
+
+  gulp.task('test', function () {
+    return gulp.src(files.specs)
+      .pipe($.jasmine({
+        verbose: true,
+        includeStuckTrace: true
+      }))
+  })
+
   gulp.task('updateSubmodule', function () {
     return gulp.src('./package.json', {read: false})
       .pipe($.shell([
@@ -168,24 +154,4 @@ module.exports = function (gulp, helperOptions) {
         }))
     })
   })
-
-  gulp.task('dev:node', ['test'], function () {
-    gulp.watch(files.dist, ['test'])
-  })
-
-  gulp.task('dev:browser', ['watch:build'], function () {
-    return gulp.src(files.test)
-      .pipe($.watch(['build/**/*']))
-      .pipe($.jasmineBrowser.specRunner())
-      .pipe($.jasmineBrowser.server({port: options.testport}))
-  })
-
-  gulp.task('test', function () {
-    console.log(files.test)
-    return gulp.src('./dist/y.js')
-      .pipe($.jasmine({
-        verbose: true,
-        includeStuckTrace: true
-      }))
-  })
 }

gulpfile.js

@@ -49,23 +49,15 @@ var runSequence = require('run-sequence').use(gulp)
 
 require('./gulpfile.helper.js')(gulp, {
   polyfills: [],
-  files: [
+  entry: './src/y.js',
-    'y.js',
-    'Connector.js',
-    'Database.js',
-    'Transaction.js',
-    'Struct.js',
-    'Utils.js',
-    'Databases/RedBlackTree.js',
-    'Databases/Memory.js',
-    'Databases/IndexedDB.js',
-    'Connectors/Test.js',
-    'Types/Array.js',
-    'Types/Map.js',
-    'Types/TextBind.js'
-  ],
   targetName: 'y.js',
-  moduleName: 'yjs'
+  moduleName: 'yjs',
+  specs: [
+    './src/Databases/RedBlackTree.spec.js',
+    './src/Types/Array.spec.js',
+    './src/Types/Map.spec.js',
+    './src/Database.spec.js'
+  ]
 })
 
 gulp.task('dev:examples', ['updateSubmodule', 'watch:dist'], function () {

package.json

@@ -68,6 +68,7 @@
     "run-sequence": "^1.1.4",
     "standard": "^5.2.2",
     "vinyl-buffer": "^1.0.0",
-    "vinyl-source-stream": "^1.1.0"
+    "vinyl-source-stream": "^1.1.0",
+    "watchify": "^3.6.0"
   }
 }

src/Connector.js

@@ -1,6 +1,6 @@
-/* globals Y */
 'use strict'
 
+module.exports = function (Y) {
   class AbstractConnector {
     /*
       opts contains the following information:
@@ -326,3 +326,4 @@ class AbstractConnector {
     }
   }
   Y.AbstractConnector = AbstractConnector
+}

src/Connectors/Test.js

@@ -1,6 +1,7 @@
-/* global getRandom, Y, wait, async */
+/* global getRandom, wait, async */
 'use strict'
 
+module.exports = function (Y) {
   var globalRoom = {
     users: {},
     buffers: {},
@@ -134,3 +135,4 @@ class Test extends Y.AbstractConnector {
   }
 
   Y.Test = Test
+}

src/Database.js

@@ -1,6 +1,6 @@
-/* global Y */
 'use strict'
 
+module.exports = function (Y) {
   /*
     Partial definition of an OperationStore.
     TODO: name it Database, operation store only holds operations.
@@ -339,3 +339,4 @@ class AbstractDatabase {
     }
   }
   Y.AbstractDatabase = AbstractDatabase
+}

src/Database.spec.js

@@ -1,5 +1,8 @@
-/* global Y, async, databases */
+/* global async, databases */
 /* eslint-env browser,jasmine,console */
+'use strict'
+
+var Y = require('./SpecHelper.js')
 
 for (let database of databases) {
   describe(`Database (${database})`, function () {

src/Databases/IndexedDB.js

@@ -1,8 +1,6 @@
-/* global Y */
-
 'use strict'
 
-Y.IndexedDB = (function () {
+module.exports = function (Y) {
   class Store {
     constructor (transaction, name) {
       this.store = transaction.objectStore(name)
@@ -177,5 +175,5 @@ Y.IndexedDB = (function () {
       yield window.indexedDB.deleteDatabase(this.namespace)
     }
   }
-  return OperationStore
+  Y.IndexedDB = OperationStore
-})()
+}

src/Databases/IndexedDB.spec.js

@@ -1,19 +0,0 @@
-/* global Y */
-/* eslint-env browser,jasmine */
-
-if (typeof window !== 'undefined' && false) {
-  describe('IndexedDB', function () {
-    var ob
-    beforeAll(function () {
-      ob = new Y.IndexedDB(null, {namespace: 'Test', gcTimeout: -1})
-    })
-
-    afterAll(function (done) {
-      ob.requestTransaction(function *() {
-        yield* ob.removeDatabase()
-        ob = null
-        done()
-      })
-    })
-  })
-}

src/Databases/Memory.js

@@ -1,7 +1,6 @@
-/* global Y */
 'use strict'
 
-Y.Memory = (function () {
+module.exports = function (Y) {
   class Transaction extends Y.Transaction {
     constructor (store) {
       super(store)
@@ -59,5 +58,5 @@ Y.Memory = (function () {
       delete this.ds
     }
   }
-  return Database
+  Y.Memory = Database
-})()
+}

src/Databases/RedBlackTree.js

@@ -1,10 +1,10 @@
-/* global Y */
 'use strict'
 
 /*
   This file contains a not so fancy implemantion of a Red Black Tree.
 */
 
+module.exports = function (Y) {
   class N {
     // A created node is always red!
     constructor (val) {
@@ -487,3 +487,4 @@ class RBTree {
   }
 
   Y.utils.RBTree = RBTree
+}

src/Databases/RedBlackTree.spec.js

@@ -1,6 +1,7 @@
-/* global Y */
 /* eslint-env browser,jasmine,console */
+'use strict'
 
+var Y = require('../SpecHelper.js')
 var numberOfRBTreeTests = 1000
 
 function itRedNodesDoNotHaveBlackChildren () {

src/Helper.spec.js

@@ -1,288 +0,0 @@
-/* global Y */
-/* eslint-env browser, jasmine */
-
-/*
-  This is just a compilation of functions that help to test this library!
-*/
-
-// When testing, you store everything on the global object. We call it g
-var g
-if (typeof global !== 'undefined') {
-  g = global
-} else if (typeof window !== 'undefined') {
-  g = window
-} else {
-  throw new Error('No global object?')
-}
-g.g = g
-
-g.YConcurrency_TestingMode = true
-
-jasmine.DEFAULT_TIMEOUT_INTERVAL = 20000
-
-g.describeManyTimes = function describeManyTimes (times, name, f) {
-  for (var i = 0; i < times; i++) {
-    describe(name, f)
-  }
-}
-
-/*
-  Wait for a specified amount of time (in ms). defaults to 5ms
-*/
-function wait (t) {
-  if (t == null) {
-    t = 5
-  }
-  return new Promise(function (resolve) {
-    setTimeout(function () {
-      resolve()
-    }, t * 2)
-  })
-}
-g.wait = wait
-
-g.databases = ['Memory']
-if (typeof window !== 'undefined') {
-  g.databases.push('IndexedDB')
-}
-
-/*
-  returns a random element of o.
-  works on Object, and Array
-*/
-function getRandom (o) {
-  if (o instanceof Array) {
-    return o[Math.floor(Math.random() * o.length)]
-  } else if (o.constructor === Object) {
-    var ks = []
-    for (var key in o) {
-      ks.push(key)
-    }
-    return o[getRandom(ks)]
-  }
-}
-g.getRandom = getRandom
-
-function getRandomNumber (n) {
-  if (n == null) {
-    n = 9999
-  }
-  return Math.floor(Math.random() * n)
-}
-g.getRandomNumber = getRandomNumber
-
-function * applyTransactions (relAmount, numberOfTransactions, objects, users, transactions) {
-  function randomTransaction (root) {
-    var f = getRandom(transactions)
-    f(root)
-  }
-  for (var i = 0; i < numberOfTransactions * relAmount + 1; i++) {
-    var r = Math.random()
-    if (r >= 0.5) {
-      // 50% chance to flush
-      users[0].connector.flushOne() // flushes for some user.. (not necessarily 0)
-    } else if (r >= 0.05) {
-      // 45% chance to create operation
-      randomTransaction(getRandom(objects))
-    } else {
-      // 5% chance to disconnect/reconnect
-      var u = getRandom(users)
-      if (u.connector.isDisconnected()) {
-        yield u.reconnect()
-      } else {
-        yield u.disconnect()
-      }
-    }
-    yield wait()
-  }
-}
-
-g.applyRandomTransactionsAllRejoinNoGC = async(function * applyRandomTransactions (users, objects, transactions, numberOfTransactions) {
-  yield* applyTransactions(1, numberOfTransactions, objects, users, transactions)
-  yield users[0].connector.flushAll()
-  yield wait()
-  for (var u in users) {
-    yield users[u].reconnect()
-  }
-  yield wait(100)
-  yield users[0].connector.flushAll()
-  yield g.garbageCollectAllUsers(users)
-})
-
-g.applyRandomTransactionsWithGC = async(function * applyRandomTransactions (users, objects, transactions, numberOfTransactions) {
-  yield* applyTransactions(1, numberOfTransactions, objects, users.slice(1), transactions)
-  yield users[0].connector.flushAll()
-  yield g.garbageCollectAllUsers(users)
-  yield wait(100)
-  for (var u in users) {
-    // TODO: here, we enforce that two users never sync at the same time with u[0]
-    //       enforce that in the connector itself!
-    yield users[u].reconnect()
-  }
-  yield wait(100)
-  yield users[0].connector.flushAll()
-  yield wait(100)
-  yield g.garbageCollectAllUsers(users)
-})
-
-g.garbageCollectAllUsers = async(function * garbageCollectAllUsers (users) {
-  // gc two times because of the two gc phases (really collect everything)
-  yield wait(100)
-  for (var i in users) {
-    yield users[i].db.garbageCollect()
-    yield users[i].db.garbageCollect()
-  }
-  yield wait(100)
-})
-
-g.compareAllUsers = async(function * compareAllUsers (users) {
-  var s1, s2 // state sets
-  var ds1, ds2 // delete sets
-  var allDels1, allDels2 // all deletions
-  var db1 = [] // operation store of user1
-
-  // t1 and t2 basically do the same. They define t[1,2], ds[1,2], and allDels[1,2]
-  function * t1 () {
-    s1 = yield* this.getStateSet()
-    ds1 = yield* this.getDeleteSet()
-    allDels1 = []
-    yield* this.ds.iterate(this, null, null, function * (d) {
-      allDels1.push(d)
-    })
-  }
-  function * t2 () {
-    s2 = yield* this.getStateSet()
-    ds2 = yield* this.getDeleteSet()
-    allDels2 = []
-    yield* this.ds.iterate(this, null, null, function * (d) {
-      allDels2.push(d)
-    })
-  }
-  yield users[0].connector.flushAll()
-  yield wait()
-  yield g.garbageCollectAllUsers(users)
-
-  for (var uid = 0; uid < users.length; uid++) {
-    var u = users[uid]
-    u.db.requestTransaction(function * () {
-      // compare deleted ops against deleteStore
-      yield* this.os.iterate(this, null, null, function * (o) {
-        if (o.deleted === true) {
-          expect(yield* this.isDeleted(o.id)).toBeTruthy()
-        }
-      })
-      // compare deleteStore against deleted ops
-      var ds = []
-      yield* this.ds.iterate(this, null, null, function * (d) {
-        ds.push(d)
-      })
-      for (var j in ds) {
-        var d = ds[j]
-        for (var i = 0; i < d.len; i++) {
-          var o = yield* this.getOperation([d.id[0], d.id[1] + i])
-          // gc'd or deleted
-          if (d.gc) {
-            expect(o).toBeFalsy()
-          } else {
-            expect(o.deleted).toBeTruthy()
-          }
-        }
-      }
-    })
-    // compare allDels tree
-    yield wait()
-    if (s1 == null) {
-      u.db.requestTransaction(function * () {
-        yield* t1.call(this)
-        yield* this.os.iterate(this, null, null, function * (o) {
-          o = Y.utils.copyObject(o)
-          delete o.origin
-          db1.push(o)
-        })
-      })
-      yield wait()
-    } else {
-      // TODO: make requestTransaction return a promise..
-      u.db.requestTransaction(function * () {
-        yield* t2.call(this)
-        expect(s1).toEqual(s2)
-        expect(allDels1).toEqual(allDels2) // inner structure
-        expect(ds1).toEqual(ds2) // exported structure
-        var count = 0
-        yield* this.os.iterate(this, null, null, function * (o) {
-          o = Y.utils.copyObject(o)
-          delete o.origin
-          expect(db1[count++]).toEqual(o)
-        })
-      })
-      yield wait()
-    }
-  }
-})
-
-g.createUsers = async(function * createUsers (self, numberOfUsers, database) {
-  if (Y.utils.globalRoom.users[0] != null) {
-    yield Y.utils.globalRoom.users[0].flushAll()
-  }
-  // destroy old users
-  for (var u in Y.utils.globalRoom.users) {
-    Y.utils.globalRoom.users[u].y.destroy()
-  }
-  self.users = null
-
-  var promises = []
-  for (var i = 0; i < numberOfUsers; i++) {
-    promises.push(Y({
-      db: {
-        name: database,
-        namespace: 'User ' + i,
-        cleanStart: true,
-        gcTimeout: -1
-      },
-      connector: {
-        name: 'Test',
-        debug: false
-      }
-    }))
-  }
-  self.users = yield Promise.all(promises)
-  return self.users
-})
-
-/*
-  Until async/await arrives in js, we use this function to wait for promises
-  by yielding them.
-*/
-function async (makeGenerator) {
-  return function (arg) {
-    var generator = makeGenerator.apply(this, arguments)
-
-    function handle (result) {
-      if (result.done) return Promise.resolve(result.value)
-
-      return Promise.resolve(result.value).then(function (res) {
-        return handle(generator.next(res))
-      }, function (err) {
-        return handle(generator.throw(err))
-      })
-    }
-    try {
-      return handle(generator.next())
-    } catch (ex) {
-      generator.throw(ex)
-      // return Promise.reject(ex)
-    }
-  }
-}
-g.async = async
-
-function logUsers (self) {
-  if (self.constructor === Array) {
-    self = {users: self}
-  }
-  self.users[0].db.logTable()
-  self.users[1].db.logTable()
-  self.users[2].db.logTable()
-}
-
-g.logUsers = logUsers

src/Struct.js

@@ -1,4 +1,3 @@
-/* global Y */
 'use strict'
 
 /*
@@ -19,7 +18,7 @@
  * requiredOps
      - Operations that are required to execute this operation.
 */
-
+module.exports = function (Y) {
   var Struct = {
     /* This is the only operation that is actually not a structure, because
     it is not stored in the OS. This is why it _does not_ have an id
@@ -334,3 +333,4 @@ var Struct = {
     }
   }
   Y.Struct = Struct
+}

src/Transaction.js

@@ -1,4 +1,3 @@
-/* global Y */
 'use strict'
 
 /*
@@ -74,6 +73,7 @@
      - this is called only by `getOperations(startSS)`. It makes an operation
        applyable on a given SS.
 */
+module.exports = function (Y) {
   class Transaction {
     /*
       Get a type based on the id of its model.
@@ -651,3 +651,4 @@ class Transaction {
     }
   }
   Y.Transaction = Transaction
+}

src/Types/Array.js

@@ -1,7 +1,6 @@
-/* global Y */
 'use strict'
 
-;(function () {
+function extend (Y) {
   class YArray {
     constructor (os, _model, idArray, valArray) {
       this.os = os
@@ -166,7 +165,7 @@
     }
   }
 
-  Y.Array = new Y.utils.CustomType({
+  Y.extend('Array', new Y.utils.CustomType({
     class: YArray,
     createType: function * YArrayCreator () {
       var modelid = this.store.getNextOpId()
@@ -188,5 +187,11 @@
       })
       return new YArray(os, model.id, idArray, valArray)
     }
-  })
+  }))
-})()
+}
+
+if (typeof Y !== 'undefined') {
+  extend(Y)
+} else {
+  module.exports = extend
+}

src/Types/Array.spec.js

@@ -1,6 +1,8 @@
-/* global createUsers, databases, wait, Y, compareAllUsers, getRandomNumber, applyRandomTransactionsAllRejoinNoGC, applyRandomTransactionsWithGC, async, garbageCollectAllUsers, describeManyTimes */
+/* global createUsers, databases, wait, compareAllUsers, getRandomNumber, applyRandomTransactionsAllRejoinNoGC, applyRandomTransactionsWithGC, async, garbageCollectAllUsers, describeManyTimes */
 /* eslint-env browser,jasmine */
+'use strict'
 
+var Y = require('../SpecHelper.js')
 var numberOfYArrayTests = 10
 var repeatArrayTests = 2
 

src/Types/Map.js

@@ -1,7 +1,6 @@
-/* global Y */
 'use strict'
 
-;(function () {
+module.exports = function (Y) {
   class YMap {
     constructor (os, model, contents, opContents) {
       this._model = model.id
@@ -292,4 +291,4 @@
       return new YMap(os, model, contents, opContents)
     }
   })
-})()
+}

src/Types/Map.spec.js

@@ -1,6 +1,8 @@
-/* global createUsers, Y, databases, compareAllUsers, getRandomNumber, applyRandomTransactionsAllRejoinNoGC, applyRandomTransactionsWithGC, async, describeManyTimes */
+/* global createUsers, databases, compareAllUsers, getRandomNumber, applyRandomTransactionsAllRejoinNoGC, applyRandomTransactionsWithGC, async, describeManyTimes */
 /* eslint-env browser,jasmine */
+'use strict'
 
+var Y = require('../SpecHelper.js')
 var numberOfYMapTests = 10
 var repeatMapTeasts = 1
 

src/Types/TextBind.js

@@ -1,7 +1,6 @@
-/* global Y */
 'use strict'
 
-;(function () {
+module.exports = function (Y) {
   class YTextBind extends Y.Array['class'] {
     constructor (os, _model, idArray, valArray) {
       super(os, _model, idArray, valArray)
@@ -287,4 +286,4 @@
       return new YTextBind(os, model.id, idArray, valArray)
     }
   })
-})()
+}

src/Utils.js

@@ -1,4 +1,3 @@
-/* global Y */
 'use strict'
 
 /*
@@ -21,6 +20,9 @@
   database request to finish). EventHandler will help you to make your type
   synchronously.
 */
+module.exports = function (Y) {
+  Y.utils = {}
+
   class EventHandler {
     /*
       onevent: is called when the structure changes.
@@ -196,3 +198,4 @@ function compareIds (id1, id2) {
     }
   }
   Y.utils.compareIds = compareIds
+}

src/y.js

@@ -1,7 +1,63 @@
 /* @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) {
+  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 () {
@@ -9,6 +65,7 @@ function Y (opts) {
         })
       })
     })
+  })
 }
 
 class 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 = {}