Svelted some our builds a bit (3KB savings)

addon/-private/initializers/store.js

@@ -1,6 +1,9 @@
 import Store from "../system/store";
-import { JSONAPISerializer, JSONSerializer, RESTSerializer } from "../serializers";
-import { JSONAPIAdapter, RESTAdapter } from "../adapters";
+import JSONAPISerializer from 'ember-data/serializers/json-api';
+import JSONSerializer from 'ember-data/serializers/json';
+import RESTSerializer from 'ember-data/serializers/rest';
+import JSONAPIAdapter from 'ember-data/adapters/json-api';
+import RESTAdapter from 'ember-data/adapters/rest';
 
 function has(applicationOrRegistry, fullName) {
   if (applicationOrRegistry.has) {

addon/-private/system/store.js

@@ -47,7 +47,7 @@ import ContainerInstanceCache from './store/container-instance-cache';
 import InternalModel from "./model/internal-model";
 import isEnabled from '../features';
 
-export let badIdFormatAssertion = '`id` passed to `findRecord()` has to be non-empty string or number';
+const badIdFormatAssertion = '`id` passed to `findRecord()` has to be non-empty string or number';
 
 const {
   A,

addon/index.js

@@ -38,7 +38,7 @@ import Model from "./model";
 import Snapshot from "./-private/system/snapshot";
 import Adapter from "./adapter";
 import Serializer from "./serializer";
-import DebugAdapter from "ember-data/-private/debug";
+import DebugAdapter from './-private/system/debug/debug-adapter';
 
 import {
   AdapterError,
@@ -61,16 +61,12 @@ import {
 } from "./-private/system/record-arrays";
 import ManyArray from "./-private/system/many-array";
 import RecordArrayManager from "./-private/system/record-array-manager";
-import {
-  JSONAPIAdapter,
-  RESTAdapter
-} from "./-private/adapters";
+import JSONAPIAdapter from './adapters/json-api';
+import RESTAdapter from './adapters/rest';
 import BuildURLMixin from "./-private/adapters/build-url-mixin";
-import {
-  JSONAPISerializer,
-  JSONSerializer,
-  RESTSerializer
-} from "./-private/serializers";
+import JSONAPISerializer from './serializers/json-api';
+import JSONSerializer from './serializers/json';
+import RESTSerializer from './serializers/rest';
 import "ember-inflector";
 import EmbeddedRecordsMixin from "./serializers/embedded-records-mixin";
 

app/initializers/data-adapter.js

@@ -1,5 +1,3 @@
-import Ember from 'ember';
-
 /*
   This initializer is here to keep backwards compatibility with code depending
   on the `data-adapter` initializer (before Ember Data was an addon).

app/initializers/injectStore.js

@@ -1,5 +1,3 @@
-import Ember from 'ember';
-
 /*
   This initializer is here to keep backwards compatibility with code depending
   on the `injectStore` initializer (before Ember Data was an addon).

app/initializers/store.js

@@ -1,5 +1,3 @@
-import Ember from 'ember';
-
 /*
   This initializer is here to keep backwards compatibility with code depending
   on the `store` initializer (before Ember Data was an addon).

app/initializers/transforms.js

@@ -1,5 +1,3 @@
-import Ember from 'ember';
-
 /*
   This initializer is here to keep backwards compatibility with code depending
   on the `transforms` initializer (before Ember Data was an addon).

index.js

@@ -3,6 +3,7 @@
 
 var path = require('path');
 var SilentError = require('silent-error');
+var Funnel = require('broccoli-funnel');
 
 // allow toggling of heimdall instrumentation
 var INSTRUMENT_HEIMDALL = false;
@@ -14,11 +15,14 @@ for (var i = 0; i < args.length; i++) {
     break;
   }
 }
+
 process.env.INSTRUMENT_HEIMDALL = INSTRUMENT_HEIMDALL;
 
-function add(options, name, array) {
-  var option = options[name] = options[name] || [];
-  option.push.apply(option, array);
+function isProductionEnv() {
+  var isProd = /production/.test(process.env.EMBER_ENV);
+  var isTest = process.env.EMBER_CLI_TEST_COMMAND;
+
+  return isProd && !isTest;
 }
 
 module.exports = {
@@ -111,10 +115,21 @@ module.exports = {
     var version   = require('./lib/version');
     var merge     = require('broccoli-merge-trees');
 
-    return this._super.treeForAddon.call(this, merge([
+    var tree = this._super.treeForAddon.call(this, merge([
       version(),
       dir
     ]));
+
+    if (isProductionEnv()) {
+      console.log('is prod');
+      tree = new Funnel(tree, {
+        exclude: [
+          /-private\/debug\.js/
+        ]
+      });
+    }
+
+    return tree;
   },
 
   _setupBabelOptions: function() {

lib/stripped-build-plugins.js

@@ -3,6 +3,7 @@ var FilterImports = require('babel-plugin-filter-imports');
 var FeatureFlags  = require('babel-plugin-feature-flags');
 var StripHeimdall = require('babel6-plugin-strip-heimdall');
 var StripClassCallCheck = require('babel6-plugin-strip-class-callcheck');
+var StripFilteredImports = require('./transforms/babel-plugin-remove-imports');
 
 function uniqueAdd(obj, key, values) {
   var a = obj[key] = obj[key] || [];
@@ -59,5 +60,9 @@ module.exports = function(environment) {
   }
   plugins.push([FilterImports, filteredImports]);
 
+  if (environment === 'production') {
+    plugins.push([StripFilteredImports, 'ember-data/-private/debug']);
+  }
+
   return { plugins, postTransformPlugins };
 };

lib/transforms/babel-plugin-remove-imports.js

@@ -0,0 +1,40 @@
+var path = require('path');
+
+function removeImports() {
+  let importDeclarationsToRemove;
+  let filteredImports;
+
+  return {
+    name: 'remove-filtered-imports',
+    visitor: {
+      Program: {
+        enter: function(_, state) {
+          filteredImports = state.opts instanceof Array ? state.opts : (state.opts ? [state.opts] : []);
+          importDeclarationsToRemove = [];
+        },
+        exit: function() {
+          importDeclarationsToRemove.forEach(function(declaration) {
+            declaration.remove();
+          });
+
+          importDeclarationsToRemove = undefined;
+        }
+      },
+
+      ImportDeclaration: function(path) {
+        const name = path.node.source.value;
+
+        if (filteredImports.indexOf(name) !== -1) {
+          importDeclarationsToRemove.push(path);
+        }
+      }
+
+    }
+  };
+}
+
+removeImports.baseDir = function() {
+  return path.join(__dirname, '../../');
+};
+
+module.exports = removeImports;

tests/unit/utils/parse-response-headers-test.js

@@ -5,10 +5,10 @@ const CRLF = '\u000d\u000a';
 
 module('unit/adapters/parse-response-headers');
 
-test('returns an EmptyObject when headersString is undefined', function(assert) {
+test('returns an NULL Object when headersString is undefined', function(assert) {
   let headers = parseResponseHeaders(undefined);
 
-  assert.deepEqual(headers, Object.create(null), 'EmptyObject is returned');
+  assert.deepEqual(headers, Object.create(null), 'NULL Object is returned');
 });
 
 test('header parsing', function(assert) {