diff --git a/packages/core/BUILD.bazel b/packages/core/BUILD.bazel
index d321ada18f..d867710bad 100644
--- a/packages/core/BUILD.bazel
+++ b/packages/core/BUILD.bazel
@@ -13,6 +13,9 @@ ng_module(
     module_name = "@angular/core",
     deps = [
         "//packages:types",
+        "//packages/core/src/di/interface",
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
         "@ngdeps//zone.js",
         "@rxjs",
         "@rxjs//operators",
diff --git a/packages/core/src/application_ref.ts b/packages/core/src/application_ref.ts
index ea3ab5cc2d..b7bbdb923f 100644
--- a/packages/core/src/application_ref.ts
+++ b/packages/core/src/application_ref.ts
@@ -14,7 +14,7 @@ import {APP_BOOTSTRAP_LISTENER, PLATFORM_INITIALIZER} from './application_tokens
 import {Console} from './console';
 import {Injectable, InjectionToken, Injector, StaticProvider} from './di';
 import {ErrorHandler} from './error_handler';
-import {isDevMode} from './is_dev_mode';
+import {Type} from './interface/type';
 import {CompilerFactory, CompilerOptions} from './linker/compiler';
 import {ComponentFactory, ComponentRef} from './linker/component_factory';
 import {ComponentFactoryBoundToModule, ComponentFactoryResolver} from './linker/component_factory_resolver';
@@ -24,9 +24,10 @@ import {WtfScopeFn, wtfCreateScope, wtfLeave} from './profile/profile';
 import {assertNgModuleType} from './render3/assert';
 import {NgModuleFactory as R3NgModuleFactory} from './render3/ng_module_ref';
 import {Testability, TestabilityRegistry} from './testability/testability';
-import {Type} from './type';
-import {scheduleMicroTask, stringify} from './util';
+import {isDevMode} from './util/is_dev_mode';
 import {isPromise} from './util/lang';
+import {scheduleMicroTask} from './util/microtask';
+import {stringify} from './util/stringify';
 import {NgZone, NoopNgZone} from './zone/ng_zone';
 
 let _platform: PlatformRef;
diff --git a/packages/core/src/change_detection/change_detection_util.ts b/packages/core/src/change_detection/change_detection_util.ts
index 60b36744d7..da963bb641 100644
--- a/packages/core/src/change_detection/change_detection_util.ts
+++ b/packages/core/src/change_detection/change_detection_util.ts
@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {getSymbolIterator, looseIdentical} from '../util';
+import {looseIdentical} from '../util/comparison';
+import {getSymbolIterator} from '../util/symbol';
 
 export function devModeEqual(a: any, b: any): boolean {
   const isListLikeIterableA = isListLikeIterable(a);
diff --git a/packages/core/src/change_detection/differs/default_iterable_differ.ts b/packages/core/src/change_detection/differs/default_iterable_differ.ts
index 9cfccfd065..1d909df30b 100644
--- a/packages/core/src/change_detection/differs/default_iterable_differ.ts
+++ b/packages/core/src/change_detection/differs/default_iterable_differ.ts
@@ -6,8 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {looseIdentical, stringify} from '../../util';
+import {looseIdentical} from '../../util/comparison';
+import {stringify} from '../../util/stringify';
 import {isListLikeIterable, iterateListLike} from '../change_detection_util';
+
 import {IterableChangeRecord, IterableChanges, IterableDiffer, IterableDifferFactory, NgIterable, TrackByFunction} from './iterable_differs';
 
 
diff --git a/packages/core/src/change_detection/differs/default_keyvalue_differ.ts b/packages/core/src/change_detection/differs/default_keyvalue_differ.ts
index 3408c7ad0f..b0d8f404b7 100644
--- a/packages/core/src/change_detection/differs/default_keyvalue_differ.ts
+++ b/packages/core/src/change_detection/differs/default_keyvalue_differ.ts
@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {looseIdentical, stringify} from '../../util';
+import {looseIdentical} from '../../util/comparison';
+import {stringify} from '../../util/stringify';
 import {isJsObject} from '../change_detection_util';
 import {KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDifferFactory} from './keyvalue_differs';
 
diff --git a/packages/core/src/change_detection/differs/iterable_differs.ts b/packages/core/src/change_detection/differs/iterable_differs.ts
index 958ba220b9..4fae01f8d9 100644
--- a/packages/core/src/change_detection/differs/iterable_differs.ts
+++ b/packages/core/src/change_detection/differs/iterable_differs.ts
@@ -6,12 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {defineInjectable} from '../../di/defs';
+import {defineInjectable} from '../../di/interface/defs';
+import {StaticProvider} from '../../di/interface/provider';
 import {Optional, SkipSelf} from '../../di/metadata';
-import {StaticProvider} from '../../di/provider';
 import {DefaultIterableDifferFactory} from '../differs/default_iterable_differ';
 
 
+
 /**
  * A type describing supported iterable types.
  *
diff --git a/packages/core/src/core.ts b/packages/core/src/core.ts
index ee0b21204c..ac379e2bb9 100644
--- a/packages/core/src/core.ts
+++ b/packages/core/src/core.ts
@@ -16,7 +16,7 @@ export * from './version';
 export {TypeDecorator} from './util/decorators';
 export * from './di';
 export {createPlatform, assertPlatform, destroyPlatform, getPlatform, PlatformRef, ApplicationRef, createPlatformFactory, NgProbeToken} from './application_ref';
-export {enableProdMode, isDevMode} from './is_dev_mode';
+export {enableProdMode, isDevMode} from './util/is_dev_mode';
 export {APP_ID, PACKAGE_ROOT_URL, PLATFORM_INITIALIZER, PLATFORM_ID, APP_BOOTSTRAP_LISTENER} from './application_tokens';
 export {APP_INITIALIZER, ApplicationInitStatus} from './application_init';
 export * from './zone';
@@ -29,7 +29,7 @@ export * from './platform_core_providers';
 export {TRANSLATIONS, TRANSLATIONS_FORMAT, LOCALE_ID, MissingTranslationStrategy} from './i18n/tokens';
 export {ApplicationModule} from './application_module';
 export {wtfCreateScope, wtfLeave, wtfStartTimeRange, wtfEndTimeRange, WtfScopeFn} from './profile/profile';
-export {Type} from './type';
+export {Type} from './interface/type';
 export {EventEmitter} from './event_emitter';
 export {ErrorHandler} from './error_handler';
 export * from './core_private_export';
diff --git a/packages/core/src/core_private_export.ts b/packages/core/src/core_private_export.ts
index 3f2b6a889d..c7413fb0c1 100644
--- a/packages/core/src/core_private_export.ts
+++ b/packages/core/src/core_private_export.ts
@@ -13,8 +13,8 @@ export {devModeEqual as ɵdevModeEqual} from './change_detection/change_detectio
 export {isListLikeIterable as ɵisListLikeIterable} from './change_detection/change_detection_util';
 export {ChangeDetectorStatus as ɵChangeDetectorStatus, isDefaultChangeDetectionStrategy as ɵisDefaultChangeDetectionStrategy} from './change_detection/constants';
 export {Console as ɵConsole} from './console';
-export {InjectableDef as ɵInjectableDef, InjectorDef as ɵInjectorDef, getInjectableDef as ɵgetInjectableDef} from './di/defs';
 export {inject as ɵinject, setCurrentInjector as ɵsetCurrentInjector} from './di/injector_compatibility';
+export {InjectableDef as ɵInjectableDef, InjectorDef as ɵInjectorDef, getInjectableDef as ɵgetInjectableDef} from './di/interface/defs';
 export {APP_ROOT as ɵAPP_ROOT} from './di/scope';
 export {ivyEnabled as ɵivyEnabled} from './ivy_switch';
 export {ComponentFactory as ɵComponentFactory} from './linker/component_factory';
@@ -26,7 +26,9 @@ export {DirectRenderer as ɵDirectRenderer, RenderDebugInfo as ɵRenderDebugInfo
 export {_sanitizeHtml as ɵ_sanitizeHtml} from './sanitization/html_sanitizer';
 export {_sanitizeStyle as ɵ_sanitizeStyle} from './sanitization/style_sanitizer';
 export {_sanitizeUrl as ɵ_sanitizeUrl} from './sanitization/url_sanitizer';
-export {global as ɵglobal, looseIdentical as ɵlooseIdentical, stringify as ɵstringify} from './util';
+export {global as ɵglobal} from './util/global';
+export {looseIdentical as ɵlooseIdentical,} from './util/comparison';
+export {stringify as ɵstringify} from './util/stringify';
 export {makeDecorator as ɵmakeDecorator} from './util/decorators';
 export {isObservable as ɵisObservable, isPromise as ɵisPromise} from './util/lang';
 export {clearOverrides as ɵclearOverrides, initServicesIfNeeded as ɵinitServicesIfNeeded, overrideComponentView as ɵoverrideComponentView, overrideProvider as ɵoverrideProvider} from './view/index';
diff --git a/packages/core/src/core_render3_private_export.ts b/packages/core/src/core_render3_private_export.ts
index c93944520c..c80ad949c9 100644
--- a/packages/core/src/core_render3_private_export.ts
+++ b/packages/core/src/core_render3_private_export.ts
@@ -171,13 +171,16 @@ export {
   NG_ELEMENT_ID as ɵNG_ELEMENT_ID,
   NG_COMPONENT_DEF as ɵNG_COMPONENT_DEF,
   NG_DIRECTIVE_DEF as ɵNG_DIRECTIVE_DEF,
-  NG_INJECTABLE_DEF as ɵNG_INJECTABLE_DEF,
-  NG_INJECTOR_DEF as ɵNG_INJECTOR_DEF,
   NG_PIPE_DEF as ɵNG_PIPE_DEF,
   NG_MODULE_DEF as ɵNG_MODULE_DEF,
   NG_BASE_DEF as ɵNG_BASE_DEF
 } from './render3/fields';
 
+export {
+  NG_INJECTABLE_DEF as ɵNG_INJECTABLE_DEF,
+  NG_INJECTOR_DEF as ɵNG_INJECTOR_DEF,
+} from './di/interface/defs';
+
 export {
   Player as ɵPlayer,
   PlayerFactory as ɵPlayerFactory,
diff --git a/packages/core/src/debug/debug_node.ts b/packages/core/src/debug/debug_node.ts
index 54c2c6cd70..de2feda2c9 100644
--- a/packages/core/src/debug/debug_node.ts
+++ b/packages/core/src/debug/debug_node.ts
@@ -7,13 +7,13 @@
  */
 
 import {Injector} from '../di';
-import {assertDomNode} from '../render3/assert';
 import {getComponent, getContext, getInjectionTokens, getInjector, getListeners, getLocalRefs, isBrowserEvents, loadLContext, loadLContextFromNode} from '../render3/discovery_utils';
 import {TNode} from '../render3/interfaces/node';
 import {StylingIndex} from '../render3/interfaces/styling';
 import {TVIEW} from '../render3/interfaces/view';
 import {getProp, getValue, isClassBasedValue} from '../render3/styling/class_and_style_bindings';
 import {getStylingContext} from '../render3/styling/util';
+import {assertDomNode} from '../util/assert';
 import {DebugContext} from '../view/index';
 
 export class EventListener {
diff --git a/packages/core/src/di.ts b/packages/core/src/di.ts
index c1f5989466..bdbf20e97a 100644
--- a/packages/core/src/di.ts
+++ b/packages/core/src/di.ts
@@ -13,13 +13,13 @@
  */
 
 export * from './di/metadata';
-export {InjectableType, InjectorType, defineInjectable, defineInjector} from './di/defs';
+export {InjectableType, InjectorType, defineInjectable, defineInjector} from './di/interface/defs';
 export {forwardRef, resolveForwardRef, ForwardRefFn} from './di/forward_ref';
 export {Injectable, InjectableDecorator, InjectableProvider} from './di/injectable';
 export {INJECTOR, Injector} from './di/injector';
 export {inject, InjectFlags} from './di/injector_compatibility';
 export {ReflectiveInjector} from './di/reflective_injector';
-export {StaticProvider, ValueProvider, ConstructorSansProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ClassProvider} from './di/provider';
+export {StaticProvider, ValueProvider, ConstructorSansProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ClassProvider} from './di/interface/provider';
 export {createInjector} from './di/r3_injector';
 export {ResolvedReflectiveFactory, ResolvedReflectiveProvider} from './di/reflective_provider';
 export {ReflectiveKey} from './di/reflective_key';
diff --git a/packages/core/src/di/forward_ref.ts b/packages/core/src/di/forward_ref.ts
index ad5b50908f..d1de311b54 100644
--- a/packages/core/src/di/forward_ref.ts
+++ b/packages/core/src/di/forward_ref.ts
@@ -6,9 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
-import {stringify} from '../util';
+import {Type} from '../interface/type';
 import {getClosureSafeProperty} from '../util/property';
+import {stringify} from '../util/stringify';
 
 
 
diff --git a/packages/core/src/di/injectable.ts b/packages/core/src/di/injectable.ts
index fd2a5c3f5d..4e55b67dc4 100644
--- a/packages/core/src/di/injectable.ts
+++ b/packages/core/src/di/injectable.ts
@@ -6,15 +6,16 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {compileInjectable as render3CompileInjectable} from '../render3/jit/injectable';
-import {Type} from '../type';
 import {TypeDecorator, makeDecorator} from '../util/decorators';
 
-import {InjectableDef, InjectableType, defineInjectable, getInjectableDef} from './defs';
-import {ClassSansProvider, ConstructorSansProvider, ExistingSansProvider, FactorySansProvider, StaticClassSansProvider, ValueSansProvider} from './provider';
+import {InjectableDef, InjectableType, defineInjectable, getInjectableDef} from './interface/defs';
+import {ClassSansProvider, ConstructorSansProvider, ExistingSansProvider, FactorySansProvider, StaticClassSansProvider, ValueSansProvider} from './interface/provider';
 import {convertInjectableProviderToFactory} from './util';
 
 
+
 /**
  * Injectable providers used in `@Injectable` decorator.
  *
diff --git a/packages/core/src/di/injection_token.ts b/packages/core/src/di/injection_token.ts
index 43ebde5302..3eb1966753 100644
--- a/packages/core/src/di/injection_token.ts
+++ b/packages/core/src/di/injection_token.ts
@@ -6,9 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 
-import {defineInjectable} from './defs';
+import {defineInjectable} from './interface/defs';
 
 /**
  * Creates a token that can be used in a DI Provider.
diff --git a/packages/core/src/di/injector.ts b/packages/core/src/di/injector.ts
index 22a1b8161a..675d2fa78e 100644
--- a/packages/core/src/di/injector.ts
+++ b/packages/core/src/di/injector.ts
@@ -6,18 +6,18 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {injectInjector} from '../render3/di';
-import {Type} from '../type';
-import {stringify} from '../util';
 import {noop} from '../util/noop';
 import {getClosureSafeProperty} from '../util/property';
+import {stringify} from '../util/stringify';
 
-import {defineInjectable} from './defs';
 import {resolveForwardRef} from './forward_ref';
 import {InjectionToken} from './injection_token';
 import {InjectFlags, inject} from './injector_compatibility';
+import {defineInjectable} from './interface/defs';
+import {ConstructorProvider, ExistingProvider, FactoryProvider, StaticClassProvider, StaticProvider, ValueProvider} from './interface/provider';
 import {Inject, Optional, Self, SkipSelf} from './metadata';
-import {ConstructorProvider, ExistingProvider, FactoryProvider, StaticClassProvider, StaticProvider, ValueProvider} from './provider';
 
 export const SOURCE = '__source';
 const _THROW_IF_NOT_FOUND = new Object();
diff --git a/packages/core/src/di/injector_compatibility.ts b/packages/core/src/di/injector_compatibility.ts
index 3eb5b47c3e..c2b1db7116 100644
--- a/packages/core/src/di/injector_compatibility.ts
+++ b/packages/core/src/di/injector_compatibility.ts
@@ -6,14 +6,15 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
-import {stringify} from '../util';
+import {Type} from '../interface/type';
+import {stringify} from '../util/stringify';
 
-import {InjectableDef, getInjectableDef} from './defs';
 import {InjectionToken} from './injection_token';
 import {Injector} from './injector';
+import {InjectableDef, getInjectableDef} from './interface/defs';
 import {Inject, Optional, Self, SkipSelf} from './metadata';
 
+
 /**
  * Injection flags for DI.
  *
diff --git a/packages/core/src/di/interface/BUILD.bazel b/packages/core/src/di/interface/BUILD.bazel
new file mode 100644
index 0000000000..79b06cb319
--- /dev/null
+++ b/packages/core/src/di/interface/BUILD.bazel
@@ -0,0 +1,22 @@
+package(default_visibility = [
+    "//packages/core:__subpackages__",
+    "//tools/public_api_guard:__pkg__",
+])
+
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "interface",
+    srcs = glob(
+        [
+            "**/*.ts",
+        ],
+    ),
+    module_name = "@angular/core/di/interface",
+    deps = [
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
+        "@rxjs",
+        "@rxjs//operators",
+    ],
+)
diff --git a/packages/core/src/di/defs.ts b/packages/core/src/di/interface/defs.ts
similarity index 93%
rename from packages/core/src/di/defs.ts
rename to packages/core/src/di/interface/defs.ts
index ab82b2fcdd..5f5ba65187 100644
--- a/packages/core/src/di/defs.ts
+++ b/packages/core/src/di/interface/defs.ts
@@ -6,10 +6,11 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {NG_INJECTABLE_DEF, NG_INJECTOR_DEF} from '../render3/fields';
-import {Type} from '../type';
+import {Type} from '../../interface/type';
+import {getClosureSafeProperty} from '../../util/property';
+import {ClassProvider, ConstructorProvider, ExistingProvider, FactoryProvider, StaticClassProvider, ValueProvider} from './provider';
+
 
-import {ClassProvider, ClassSansProvider, ConstructorProvider, ConstructorSansProvider, ExistingProvider, ExistingSansProvider, FactoryProvider, FactorySansProvider, StaticClassProvider, StaticClassSansProvider, ValueProvider, ValueSansProvider} from './provider';
 
 /**
  * Information about how a type or `InjectionToken` interfaces with the DI system.
@@ -178,4 +179,7 @@ export function getInjectableDef<T>(type: any): InjectableDef<T>|null {
  */
 export function getInjectorDef<T>(type: any): InjectorDef<T>|null {
   return type && type.hasOwnProperty(NG_INJECTOR_DEF) ? (type as any)[NG_INJECTOR_DEF] : null;
-}
\ No newline at end of file
+}
+
+export const NG_INJECTABLE_DEF = getClosureSafeProperty({ngInjectableDef: getClosureSafeProperty});
+export const NG_INJECTOR_DEF = getClosureSafeProperty({ngInjectorDef: getClosureSafeProperty});
diff --git a/packages/core/src/di/provider.ts b/packages/core/src/di/interface/provider.ts
similarity index 99%
rename from packages/core/src/di/provider.ts
rename to packages/core/src/di/interface/provider.ts
index 7263eebe13..d78314457f 100644
--- a/packages/core/src/di/provider.ts
+++ b/packages/core/src/di/interface/provider.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../../interface/type';
 
 /**
  * Configures the `Injector` to return a value for a token.
diff --git a/packages/core/src/di/metadata.ts b/packages/core/src/di/metadata.ts
index b3a0e72d8e..ba9a4e5b22 100644
--- a/packages/core/src/di/metadata.ts
+++ b/packages/core/src/di/metadata.ts
@@ -6,12 +6,14 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ClassSansProvider, ConstructorProvider, ConstructorSansProvider, ExistingProvider, ExistingSansProvider, FactoryProvider, FactorySansProvider, StaticClassProvider, StaticClassSansProvider, ValueProvider, ValueSansProvider} from '../di/provider';
+import {Type} from '../interface/type';
 import {ReflectionCapabilities} from '../reflection/reflection_capabilities';
-import {Type} from '../type';
 import {makeDecorator, makeParamDecorator} from '../util/decorators';
 import {EMPTY_ARRAY} from '../view/util';
 
+import {ClassSansProvider, ConstructorProvider, ConstructorSansProvider, ExistingProvider, ExistingSansProvider, FactoryProvider, FactorySansProvider, StaticClassProvider, StaticClassSansProvider, ValueProvider, ValueSansProvider} from './interface/provider';
+
+
 
 /**
  * Type of the Inject decorator / constructor function.
diff --git a/packages/core/src/di/r3_injector.ts b/packages/core/src/di/r3_injector.ts
index c80731ded4..b24a5bfed4 100644
--- a/packages/core/src/di/r3_injector.ts
+++ b/packages/core/src/di/r3_injector.ts
@@ -6,16 +6,16 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {OnDestroy} from '../metadata/lifecycle_hooks';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {stringify} from '../util/stringify';
 
-import {InjectableDef, InjectableType, InjectorType, InjectorTypeWithProviders, getInjectableDef, getInjectorDef} from './defs';
 import {resolveForwardRef} from './forward_ref';
 import {InjectionToken} from './injection_token';
 import {INJECTOR, Injector, NullInjector, THROW_IF_NOT_FOUND, USE_VALUE} from './injector';
 import {InjectFlags, inject, injectArgs, setCurrentInjector} from './injector_compatibility';
-import {ClassProvider, ConstructorProvider, ExistingProvider, FactoryProvider, Provider, StaticClassProvider, StaticProvider, TypeProvider, ValueProvider} from './provider';
+import {InjectableDef, InjectableType, InjectorType, InjectorTypeWithProviders, getInjectableDef, getInjectorDef} from './interface/defs';
+import {ClassProvider, ConstructorProvider, ExistingProvider, FactoryProvider, Provider, StaticClassProvider, StaticProvider, TypeProvider, ValueProvider} from './interface/provider';
 import {APP_ROOT} from './scope';
 
 
diff --git a/packages/core/src/di/reflective_errors.ts b/packages/core/src/di/reflective_errors.ts
index c88ffa441d..156b40e69e 100644
--- a/packages/core/src/di/reflective_errors.ts
+++ b/packages/core/src/di/reflective_errors.ts
@@ -7,9 +7,9 @@
  */
 
 import {wrappedError} from '../error_handler';
-import {ERROR_ORIGINAL_ERROR, getOriginalError} from '../errors';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {Type} from '../interface/type';
+import {ERROR_ORIGINAL_ERROR} from '../util/errors';
+import {stringify} from '../util/stringify';
 
 import {ReflectiveInjector} from './reflective_injector';
 import {ReflectiveKey} from './reflective_key';
diff --git a/packages/core/src/di/reflective_injector.ts b/packages/core/src/di/reflective_injector.ts
index aa30e76ed2..8ce87b226f 100644
--- a/packages/core/src/di/reflective_injector.ts
+++ b/packages/core/src/di/reflective_injector.ts
@@ -7,12 +7,13 @@
  */
 
 import {Injector, THROW_IF_NOT_FOUND} from './injector';
+import {Provider} from './interface/provider';
 import {Self, SkipSelf} from './metadata';
-import {Provider} from './provider';
 import {cyclicDependencyError, instantiationError, noProviderError, outOfBoundsError} from './reflective_errors';
 import {ReflectiveKey} from './reflective_key';
 import {ReflectiveDependency, ResolvedReflectiveFactory, ResolvedReflectiveProvider, resolveReflectiveProviders} from './reflective_provider';
 
+
 // Threshold for the dynamic version
 const UNDEFINED = new Object();
 
diff --git a/packages/core/src/di/reflective_key.ts b/packages/core/src/di/reflective_key.ts
index 476f62906f..f7219f60f5 100644
--- a/packages/core/src/di/reflective_key.ts
+++ b/packages/core/src/di/reflective_key.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {stringify} from '../util';
+import {stringify} from '../util/stringify';
 import {resolveForwardRef} from './forward_ref';
 
 
diff --git a/packages/core/src/di/reflective_provider.ts b/packages/core/src/di/reflective_provider.ts
index 3d4666e82d..f9a8c26e7b 100644
--- a/packages/core/src/di/reflective_provider.ts
+++ b/packages/core/src/di/reflective_provider.ts
@@ -6,13 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {reflector} from '../reflection/reflection';
-import {Type} from '../type';
 
 import {resolveForwardRef} from './forward_ref';
 import {InjectionToken} from './injection_token';
+import {ClassProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ValueProvider} from './interface/provider';
 import {Inject, Optional, Self, SkipSelf} from './metadata';
-import {ClassProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ValueProvider} from './provider';
 import {invalidProviderError, mixingMultiProvidersWithRegularProvidersError, noAnnotationError} from './reflective_errors';
 import {ReflectiveKey} from './reflective_key';
 
diff --git a/packages/core/src/di/scope.ts b/packages/core/src/di/scope.ts
index e4a3badc71..240ee2af0b 100644
--- a/packages/core/src/di/scope.ts
+++ b/packages/core/src/di/scope.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 import {InjectionToken} from './injection_token';
 
 
diff --git a/packages/core/src/di/util.ts b/packages/core/src/di/util.ts
index e8828521d7..de0294beb7 100644
--- a/packages/core/src/di/util.ts
+++ b/packages/core/src/di/util.ts
@@ -6,12 +6,12 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {ReflectionCapabilities} from '../reflection/reflection_capabilities';
-import {Type} from '../type';
 import {getClosureSafeProperty} from '../util/property';
 
 import {inject, injectArgs} from './injector_compatibility';
-import {ClassSansProvider, ConstructorSansProvider, ExistingSansProvider, FactorySansProvider, StaticClassSansProvider, ValueProvider, ValueSansProvider} from './provider';
+import {ClassSansProvider, ConstructorSansProvider, ExistingSansProvider, FactorySansProvider, StaticClassSansProvider, ValueProvider, ValueSansProvider} from './interface/provider';
 
 const USE_VALUE =
     getClosureSafeProperty<ValueProvider>({provide: String, useValue: getClosureSafeProperty});
diff --git a/packages/core/src/error_handler.ts b/packages/core/src/error_handler.ts
index a85273ccac..3dc1442ee0 100644
--- a/packages/core/src/error_handler.ts
+++ b/packages/core/src/error_handler.ts
@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ERROR_ORIGINAL_ERROR, getDebugContext, getErrorLogger, getOriginalError} from './errors';
+import {getDebugContext, getErrorLogger, getOriginalError} from './errors';
+import {ERROR_ORIGINAL_ERROR} from './util/errors';
 
 
 
diff --git a/packages/core/src/errors.ts b/packages/core/src/errors.ts
index 002dbe903d..74712bc004 100644
--- a/packages/core/src/errors.ts
+++ b/packages/core/src/errors.ts
@@ -6,14 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {ERROR_DEBUG_CONTEXT, ERROR_LOGGER, ERROR_ORIGINAL_ERROR, ERROR_TYPE} from './util/errors';
 import {DebugContext} from './view';
 
-export const ERROR_TYPE = 'ngType';
-export const ERROR_DEBUG_CONTEXT = 'ngDebugContext';
-export const ERROR_ORIGINAL_ERROR = 'ngOriginalError';
-export const ERROR_LOGGER = 'ngErrorLogger';
-
-
 export function getType(error: Error): Function {
   return (error as any)[ERROR_TYPE];
 }
diff --git a/packages/core/src/interface/BUILD.bazel b/packages/core/src/interface/BUILD.bazel
new file mode 100644
index 0000000000..ccc87abff0
--- /dev/null
+++ b/packages/core/src/interface/BUILD.bazel
@@ -0,0 +1,16 @@
+package(default_visibility = [
+    "//packages/core:__subpackages__",
+    "//tools/public_api_guard:__pkg__",
+])
+
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "interface",
+    srcs = glob(
+        [
+            "*.ts",
+        ],
+    ),
+    module_name = "@angular/core/interface",
+)
diff --git a/packages/core/src/type.ts b/packages/core/src/interface/type.ts
similarity index 100%
rename from packages/core/src/type.ts
rename to packages/core/src/interface/type.ts
diff --git a/packages/core/src/linker/compiler.ts b/packages/core/src/linker/compiler.ts
index f5e8e4e1a8..d0bfaad9da 100644
--- a/packages/core/src/linker/compiler.ts
+++ b/packages/core/src/linker/compiler.ts
@@ -8,11 +8,11 @@
 
 import {Injectable} from '../di/injectable';
 import {InjectionToken} from '../di/injection_token';
-import {StaticProvider} from '../di/provider';
+import {StaticProvider} from '../di/interface/provider';
 import {MissingTranslationStrategy} from '../i18n/tokens';
+import {Type} from '../interface/type';
 import {ViewEncapsulation} from '../metadata';
 import {NgModuleFactory as NgModuleFactoryR3} from '../render3/ng_module_ref';
-import {Type} from '../type';
 
 import {ComponentFactory} from './component_factory';
 import {NgModuleFactory} from './ng_module_factory';
diff --git a/packages/core/src/linker/component_factory.ts b/packages/core/src/linker/component_factory.ts
index 660c45ea79..4ce743ca4a 100644
--- a/packages/core/src/linker/component_factory.ts
+++ b/packages/core/src/linker/component_factory.ts
@@ -8,7 +8,7 @@
 
 import {ChangeDetectorRef} from '../change_detection/change_detection';
 import {Injector} from '../di/injector';
-import {Type} from '../type';
+import {Type} from '../interface/type';
 
 import {ElementRef} from './element_ref';
 import {NgModuleRef} from './ng_module_factory';
diff --git a/packages/core/src/linker/component_factory_resolver.ts b/packages/core/src/linker/component_factory_resolver.ts
index ac1f0abbe4..7d925672a5 100644
--- a/packages/core/src/linker/component_factory_resolver.ts
+++ b/packages/core/src/linker/component_factory_resolver.ts
@@ -7,8 +7,8 @@
  */
 
 import {Injector} from '../di/injector';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {Type} from '../interface/type';
+import {stringify} from '../util/stringify';
 
 import {ComponentFactory, ComponentRef} from './component_factory';
 import {NgModuleRef} from './ng_module_factory';
diff --git a/packages/core/src/linker/ng_module_factory.ts b/packages/core/src/linker/ng_module_factory.ts
index e307100003..043d450dac 100644
--- a/packages/core/src/linker/ng_module_factory.ts
+++ b/packages/core/src/linker/ng_module_factory.ts
@@ -7,7 +7,7 @@
  */
 
 import {Injector} from '../di/injector';
-import {Type} from '../type';
+import {Type} from '../interface/type';
 
 import {ComponentFactoryResolver} from './component_factory_resolver';
 
diff --git a/packages/core/src/linker/ng_module_factory_loader.ts b/packages/core/src/linker/ng_module_factory_loader.ts
index b6a678e6d6..13e57d8fd3 100644
--- a/packages/core/src/linker/ng_module_factory_loader.ts
+++ b/packages/core/src/linker/ng_module_factory_loader.ts
@@ -6,11 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../interface/type';
 import {NgModuleFactory as R3NgModuleFactory, NgModuleType} from '../render3/ng_module_ref';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {stringify} from '../util/stringify';
+
 import {NgModuleFactory} from './ng_module_factory';
 
+
 /**
  * Used to load ng module factories.
  *
diff --git a/packages/core/src/linker/query_list.ts b/packages/core/src/linker/query_list.ts
index 9060cb6dbc..a3aec4360f 100644
--- a/packages/core/src/linker/query_list.ts
+++ b/packages/core/src/linker/query_list.ts
@@ -9,7 +9,7 @@
 import {Observable} from 'rxjs';
 
 import {EventEmitter} from '../event_emitter';
-import {getSymbolIterator} from '../util';
+import {getSymbolIterator} from '../util/symbol';
 
 
 /**
diff --git a/packages/core/src/metadata/di.ts b/packages/core/src/metadata/di.ts
index b24498a57c..c22c146119 100644
--- a/packages/core/src/metadata/di.ts
+++ b/packages/core/src/metadata/di.ts
@@ -7,7 +7,7 @@
  */
 
 import {InjectionToken} from '../di/injection_token';
-import {Type} from '../type';
+import {Type} from '../interface/type';
 import {makeParamDecorator, makePropDecorator} from '../util/decorators';
 
 /**
diff --git a/packages/core/src/metadata/directives.ts b/packages/core/src/metadata/directives.ts
index b0ef9538c2..e6ceea61b1 100644
--- a/packages/core/src/metadata/directives.ts
+++ b/packages/core/src/metadata/directives.ts
@@ -8,10 +8,10 @@
 
 import {ChangeDetectionStrategy} from '../change_detection/constants';
 import {Provider} from '../di';
+import {Type} from '../interface/type';
 import {NG_BASE_DEF} from '../render3/fields';
 import {compileComponent as render3CompileComponent, compileDirective as render3CompileDirective} from '../render3/jit/directive';
 import {compilePipe as render3CompilePipe} from '../render3/jit/pipe';
-import {Type} from '../type';
 import {TypeDecorator, makeDecorator, makePropDecorator} from '../util/decorators';
 import {noop} from '../util/noop';
 import {fillProperties} from '../util/property';
diff --git a/packages/core/src/metadata/ng_module.ts b/packages/core/src/metadata/ng_module.ts
index bcad7cdaa6..a171c2a720 100644
--- a/packages/core/src/metadata/ng_module.ts
+++ b/packages/core/src/metadata/ng_module.ts
@@ -7,14 +7,15 @@
  */
 
 import {ApplicationRef} from '../application_ref';
-import {InjectorType, defineInjector} from '../di/defs';
-import {Provider} from '../di/provider';
+import {InjectorType, defineInjector} from '../di/interface/defs';
+import {Provider} from '../di/interface/provider';
 import {convertInjectableProviderToFactory} from '../di/util';
+import {Type} from '../interface/type';
 import {NgModuleType} from '../render3';
 import {compileNgModule as render3CompileNgModule} from '../render3/jit/module';
-import {Type} from '../type';
 import {TypeDecorator, makeDecorator} from '../util/decorators';
 
+
 /**
  * Represents the expansion of an `NgModule` into its scopes.
  *
diff --git a/packages/core/src/profile/wtf_impl.ts b/packages/core/src/profile/wtf_impl.ts
index 5714aebb30..ca2972d13c 100644
--- a/packages/core/src/profile/wtf_impl.ts
+++ b/packages/core/src/profile/wtf_impl.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {global} from '../util';
+import {global} from '../util/global';
 
 /**
  * A scope function for the Web Tracing Framework (WTF).
diff --git a/packages/core/src/r3_symbols.ts b/packages/core/src/r3_symbols.ts
index 7b8c72a138..e040915411 100644
--- a/packages/core/src/r3_symbols.ts
+++ b/packages/core/src/r3_symbols.ts
@@ -21,14 +21,15 @@
  * The below symbols are used for @Injectable and @NgModule compilation.
  */
 
-export {InjectableDef, InjectorDef, defineInjectable, defineInjector} from './di/defs';
 export {inject} from './di/injector_compatibility';
+export {InjectableDef, InjectorDef, defineInjectable, defineInjector} from './di/interface/defs';
 export {NgModuleDef, NgModuleDefWithMeta} from './metadata/ng_module';
 export {defineNgModule} from './render3/definition';
 export {setClassMetadata} from './render3/metadata';
 export {NgModuleFactory} from './render3/ng_module_ref';
 
 
+
 /**
  * The existence of this constant (in this particular file) informs the Angular compiler that the
  * current program is actually @angular/core, which needs to be compiled specially.
diff --git a/packages/core/src/reflection/platform_reflection_capabilities.ts b/packages/core/src/reflection/platform_reflection_capabilities.ts
index 0fee368520..6d4ef3384c 100644
--- a/packages/core/src/reflection/platform_reflection_capabilities.ts
+++ b/packages/core/src/reflection/platform_reflection_capabilities.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 import {GetterFn, MethodFn, SetterFn} from './types';
 
 export interface PlatformReflectionCapabilities {
diff --git a/packages/core/src/reflection/reflection_capabilities.ts b/packages/core/src/reflection/reflection_capabilities.ts
index ca3e397df9..c95112c140 100644
--- a/packages/core/src/reflection/reflection_capabilities.ts
+++ b/packages/core/src/reflection/reflection_capabilities.ts
@@ -6,14 +6,16 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type, isType} from '../type';
-import {global, stringify} from '../util';
+import {Type, isType} from '../interface/type';
 import {ANNOTATIONS, PARAMETERS, PROP_METADATA} from '../util/decorators';
+import {global} from '../util/global';
+import {stringify} from '../util/stringify';
 
 import {PlatformReflectionCapabilities} from './platform_reflection_capabilities';
 import {GetterFn, MethodFn, SetterFn} from './types';
 
 
+
 /**
  * Attention: These regex has to hold even if the code is minified!
  */
diff --git a/packages/core/src/reflection/reflector.ts b/packages/core/src/reflection/reflector.ts
index 678941f442..6d7b8634f0 100644
--- a/packages/core/src/reflection/reflector.ts
+++ b/packages/core/src/reflection/reflector.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 import {PlatformReflectionCapabilities} from './platform_reflection_capabilities';
 import {GetterFn, MethodFn, SetterFn} from './types';
 
diff --git a/packages/core/src/render3/assert.ts b/packages/core/src/render3/assert.ts
index 3b7bc99403..a05546be2c 100644
--- a/packages/core/src/render3/assert.ts
+++ b/packages/core/src/render3/assert.ts
@@ -6,61 +6,12 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {assertDefined, assertEqual, throwError} from '../util/assert';
+
 import {getComponentDef, getNgModuleDef} from './definition';
 import {TNode} from './interfaces/node';
 import {LView} from './interfaces/view';
 
-// The functions in this file verify that the assumptions we are making
-// about state in an instruction are correct before implementing any logic.
-// They are meant only to be called in dev mode as sanity checks.
-
-export function assertNumber(actual: any, msg: string) {
-  if (typeof actual != 'number') {
-    throwError(msg);
-  }
-}
-
-export function assertEqual<T>(actual: T, expected: T, msg: string) {
-  if (actual != expected) {
-    throwError(msg);
-  }
-}
-
-export function assertNotEqual<T>(actual: T, expected: T, msg: string) {
-  if (actual == expected) {
-    throwError(msg);
-  }
-}
-
-export function assertSame<T>(actual: T, expected: T, msg: string) {
-  if (actual !== expected) {
-    throwError(msg);
-  }
-}
-
-export function assertLessThan<T>(actual: T, expected: T, msg: string) {
-  if (actual >= expected) {
-    throwError(msg);
-  }
-}
-
-export function assertGreaterThan<T>(actual: T, expected: T, msg: string) {
-  if (actual <= expected) {
-    throwError(msg);
-  }
-}
-
-export function assertNotDefined<T>(actual: T, msg: string) {
-  if (actual != null) {
-    throwError(msg);
-  }
-}
-
-export function assertDefined<T>(actual: T, msg: string) {
-  if (actual == null) {
-    throwError(msg);
-  }
-}
 
 export function assertComponentType(
     actual: any,
@@ -80,17 +31,6 @@ export function assertNgModuleType(
   }
 }
 
-function throwError(msg: string): never {
-  // tslint:disable-next-line
-  debugger;  // Left intentionally for better debugger experience.
-  throw new Error(`ASSERTION ERROR: ${msg}`);
-}
-
-export function assertDomNode(node: any) {
-  assertEqual(node instanceof Node, true, 'The provided value must be an instance of a DOM Node');
-}
-
-
 export function assertPreviousIsParent(isParent: boolean) {
   assertEqual(isParent, true, 'previousOrParentTNode should be a parent');
 }
@@ -104,7 +44,3 @@ export function assertDataNext(lView: LView, index: number, arr?: any[]) {
   assertEqual(
       arr.length, index, `index ${index} expected to be at the end of arr (length ${arr.length})`);
 }
-
-export function assertDataInRange(arr: any[], index: number) {
-  assertLessThan(index, arr ? arr.length : 0, 'index expected to be a valid data index');
-}
diff --git a/packages/core/src/render3/bindings.ts b/packages/core/src/render3/bindings.ts
index 88f63a9bd2..8ddbca9da7 100644
--- a/packages/core/src/render3/bindings.ts
+++ b/packages/core/src/render3/bindings.ts
@@ -8,7 +8,7 @@
 
 import {devModeEqual} from '../change_detection/change_detection_util';
 
-import {assertDataInRange, assertLessThan, assertNotEqual} from './assert';
+import {assertDataInRange, assertLessThan, assertNotEqual} from '../util/assert';
 import {throwErrorIfNoChangesMode} from './errors';
 import {BINDING_INDEX, LView} from './interfaces/view';
 import {getCheckNoChangesMode, isCreationMode} from './state';
diff --git a/packages/core/src/render3/component.ts b/packages/core/src/render3/component.ts
index 30daba0a46..e1288eec33 100644
--- a/packages/core/src/render3/component.ts
+++ b/packages/core/src/render3/component.ts
@@ -11,8 +11,9 @@
 import {Type} from '../core';
 import {Injector} from '../di/injector';
 import {Sanitizer} from '../sanitization/security';
+import {assertDefined} from '../util/assert';
 
-import {assertComponentType, assertDefined} from './assert';
+import {assertComponentType} from './assert';
 import {getComponentDef} from './definition';
 import {diPublicInInjector, getOrCreateNodeInjectorForNode} from './di';
 import {publishDefaultGlobalUtils} from './global_utils';
diff --git a/packages/core/src/render3/component_ref.ts b/packages/core/src/render3/component_ref.ts
index cd571131c1..4bc2479416 100644
--- a/packages/core/src/render3/component_ref.ts
+++ b/packages/core/src/render3/component_ref.ts
@@ -10,15 +10,17 @@ import {ChangeDetectorRef as ViewEngine_ChangeDetectorRef} from '../change_detec
 import {InjectionToken} from '../di/injection_token';
 import {Injector} from '../di/injector';
 import {inject} from '../di/injector_compatibility';
+import {Type} from '../interface/type';
 import {ComponentFactory as viewEngine_ComponentFactory, ComponentRef as viewEngine_ComponentRef} from '../linker/component_factory';
 import {ComponentFactoryResolver as viewEngine_ComponentFactoryResolver} from '../linker/component_factory_resolver';
 import {ElementRef as viewEngine_ElementRef} from '../linker/element_ref';
 import {NgModuleRef as viewEngine_NgModuleRef} from '../linker/ng_module_factory';
 import {RendererFactory2} from '../render/api';
 import {Sanitizer} from '../sanitization/security';
-import {Type} from '../type';
+import {assertDefined} from '../util/assert';
 import {VERSION} from '../version';
-import {assertComponentType, assertDefined} from './assert';
+
+import {assertComponentType} from './assert';
 import {LifecycleHooksFeature, createRootComponent, createRootComponentView, createRootContext} from './component';
 import {getComponentDef} from './definition';
 import {NodeInjector} from './di';
diff --git a/packages/core/src/render3/context_discovery.ts b/packages/core/src/render3/context_discovery.ts
index 651f37cf20..c866403e67 100644
--- a/packages/core/src/render3/context_discovery.ts
+++ b/packages/core/src/render3/context_discovery.ts
@@ -5,8 +5,8 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import './ng_dev_mode';
-import {assertDomNode} from './assert';
+import '../util/ng_dev_mode';
+import {assertDomNode} from '../util/assert';
 import {EMPTY_ARRAY} from './empty';
 import {LContext, MONKEY_PATCH_KEY_NAME} from './interfaces/context';
 import {TNode, TNodeFlags} from './interfaces/node';
diff --git a/packages/core/src/render3/definition.ts b/packages/core/src/render3/definition.ts
index dc6b0bd9da..a73e0bd9c3 100644
--- a/packages/core/src/render3/definition.ts
+++ b/packages/core/src/render3/definition.ts
@@ -6,13 +6,15 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import './ng_dev_mode';
+import '../util/ng_dev_mode';
 
 import {ChangeDetectionStrategy} from '../change_detection/constants';
+import {Mutable, Type} from '../interface/type';
 import {NgModuleDef} from '../metadata/ng_module';
 import {ViewEncapsulation} from '../metadata/view';
-import {Mutable, Type} from '../type';
-import {noSideEffects, stringify} from '../util';
+import {noSideEffects} from '../util/closure';
+import {stringify} from '../util/stringify';
+
 import {EMPTY_ARRAY, EMPTY_OBJ} from './empty';
 import {NG_COMPONENT_DEF, NG_DIRECTIVE_DEF, NG_MODULE_DEF, NG_PIPE_DEF} from './fields';
 import {BaseDef, ComponentDef, ComponentDefFeature, ComponentQuery, ComponentTemplate, ComponentType, DirectiveDef, DirectiveDefFeature, DirectiveType, DirectiveTypesOrFactory, HostBindingsFunction, PipeDef, PipeType, PipeTypesOrFactory} from './interfaces/definition';
diff --git a/packages/core/src/render3/di.ts b/packages/core/src/render3/di.ts
index 362ae8d2ea..0e409af616 100644
--- a/packages/core/src/render3/di.ts
+++ b/packages/core/src/render3/di.ts
@@ -6,13 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {getInjectableDef, getInjectorDef} from '../di/defs';
 import {InjectionToken} from '../di/injection_token';
 import {Injector} from '../di/injector';
 import {InjectFlags, injectRootLimpMode, setInjectImplementation} from '../di/injector_compatibility';
-import {Type} from '../type';
+import {getInjectableDef, getInjectorDef} from '../di/interface/defs';
+import {Type} from '../interface/type';
 
-import {assertDefined, assertEqual} from './assert';
+import {assertDefined, assertEqual} from '../util/assert';
 import {getComponentDef, getDirectiveDef, getPipeDef} from './definition';
 import {NG_ELEMENT_ID} from './fields';
 import {DirectiveDef} from './interfaces/definition';
@@ -24,6 +24,7 @@ import {getLView, getPreviousOrParentTNode, setTNodeAndViewData} from './state';
 import {findComponentView, getParentInjectorIndex, getParentInjectorView, hasParentInjector, isComponent, isComponentDef, stringify} from './util';
 
 
+
 /**
  * Defines if the call to `inject` should include `viewProviders` in its resolution.
  *
diff --git a/packages/core/src/render3/di_setup.ts b/packages/core/src/render3/di_setup.ts
index a60f9c8f8b..9db9bcce86 100644
--- a/packages/core/src/render3/di_setup.ts
+++ b/packages/core/src/render3/di_setup.ts
@@ -8,7 +8,7 @@
 
 
 import {resolveForwardRef} from '../di/forward_ref';
-import {Provider} from '../di/provider';
+import {Provider} from '../di/interface/provider';
 import {isTypeProvider, providerToFactory} from '../di/r3_injector';
 
 import {DirectiveDef} from '.';
diff --git a/packages/core/src/render3/discovery_utils.ts b/packages/core/src/render3/discovery_utils.ts
index 08ccd32fc4..e58eb0ef84 100644
--- a/packages/core/src/render3/discovery_utils.ts
+++ b/packages/core/src/render3/discovery_utils.ts
@@ -8,7 +8,7 @@
 
 import {Injector} from '../di/injector';
 
-import {assertDefined} from './assert';
+import {assertDefined} from '../util/assert';
 import {discoverLocalRefs, getComponentAtNodeIndex, getDirectivesAtNodeIndex, getLContext} from './context_discovery';
 import {NodeInjector} from './di';
 import {LContext} from './interfaces/context';
diff --git a/packages/core/src/render3/empty.ts b/packages/core/src/render3/empty.ts
index 46dc61bdf6..a3870a64cd 100644
--- a/packages/core/src/render3/empty.ts
+++ b/packages/core/src/render3/empty.ts
@@ -5,7 +5,7 @@
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
-import './ng_dev_mode';
+import '../util/ng_dev_mode';
 
 /**
  * This file contains reuseable "empty" symbols that can be used as default return values
diff --git a/packages/core/src/render3/features/inherit_definition_feature.ts b/packages/core/src/render3/features/inherit_definition_feature.ts
index 5e2f7cc775..240769393b 100644
--- a/packages/core/src/render3/features/inherit_definition_feature.ts
+++ b/packages/core/src/render3/features/inherit_definition_feature.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../../type';
+import {Type} from '../../interface/type';
 import {fillProperties} from '../../util/property';
 import {EMPTY_ARRAY, EMPTY_OBJ} from '../empty';
 import {ComponentDef, DirectiveDef, DirectiveDefFeature, RenderFlags} from '../interfaces/definition';
diff --git a/packages/core/src/render3/features/providers_feature.ts b/packages/core/src/render3/features/providers_feature.ts
index 7ecca8807f..e95d389c5a 100644
--- a/packages/core/src/render3/features/providers_feature.ts
+++ b/packages/core/src/render3/features/providers_feature.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {Provider} from '../../di/provider';
+import {Provider} from '../../di/interface/provider';
 import {providersResolver} from '../di_setup';
 import {DirectiveDef} from '../interfaces/definition';
 
diff --git a/packages/core/src/render3/fields.ts b/packages/core/src/render3/fields.ts
index 3a187f0856..711166a3dc 100644
--- a/packages/core/src/render3/fields.ts
+++ b/packages/core/src/render3/fields.ts
@@ -10,8 +10,6 @@ import {getClosureSafeProperty} from '../util/property';
 
 export const NG_COMPONENT_DEF = getClosureSafeProperty({ngComponentDef: getClosureSafeProperty});
 export const NG_DIRECTIVE_DEF = getClosureSafeProperty({ngDirectiveDef: getClosureSafeProperty});
-export const NG_INJECTABLE_DEF = getClosureSafeProperty({ngInjectableDef: getClosureSafeProperty});
-export const NG_INJECTOR_DEF = getClosureSafeProperty({ngInjectorDef: getClosureSafeProperty});
 export const NG_PIPE_DEF = getClosureSafeProperty({ngPipeDef: getClosureSafeProperty});
 export const NG_MODULE_DEF = getClosureSafeProperty({ngModuleDef: getClosureSafeProperty});
 export const NG_BASE_DEF = getClosureSafeProperty({ngBaseDef: getClosureSafeProperty});
diff --git a/packages/core/src/render3/global_utils.ts b/packages/core/src/render3/global_utils.ts
index 7abd6f9189..e52ed79ccd 100644
--- a/packages/core/src/render3/global_utils.ts
+++ b/packages/core/src/render3/global_utils.ts
@@ -5,9 +5,9 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {global} from '../util';
+import {assertDefined} from '../util/assert';
+import {global} from '../util/global';
 
-import {assertDefined} from './assert';
 import {getComponent, getContext, getDirectives, getHostElement, getInjector, getListeners, getPlayers, getRootComponents, getViewComponent, markDirty} from './global_utils_api';
 
 
diff --git a/packages/core/src/render3/hooks.ts b/packages/core/src/render3/hooks.ts
index c00146b3e9..5cdd95c648 100644
--- a/packages/core/src/render3/hooks.ts
+++ b/packages/core/src/render3/hooks.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {assertEqual} from './assert';
+import {assertEqual} from '../util/assert';
 import {DirectiveDef} from './interfaces/definition';
 import {TNode} from './interfaces/node';
 import {FLAGS, HookData, LView, LViewFlags, TView} from './interfaces/view';
diff --git a/packages/core/src/render3/i18n.ts b/packages/core/src/render3/i18n.ts
index 9d27b4b402..4d62e76c99 100644
--- a/packages/core/src/render3/i18n.ts
+++ b/packages/core/src/render3/i18n.ts
@@ -9,7 +9,7 @@
 import {SRCSET_ATTRS, URI_ATTRS, VALID_ATTRS, VALID_ELEMENTS, getTemplateContent} from '../sanitization/html_sanitizer';
 import {InertBodyHelper} from '../sanitization/inert_body';
 import {_sanitizeUrl, sanitizeSrcset} from '../sanitization/url_sanitizer';
-import {assertDefined, assertEqual, assertGreaterThan} from './assert';
+import {assertDefined, assertEqual, assertGreaterThan} from '../util/assert';
 import {attachPatchData} from './context_discovery';
 import {allocExpando, createNodeAtIndex, elementAttribute, load, textBinding} from './instructions';
 import {LContainer, NATIVE} from './interfaces/container';
diff --git a/packages/core/src/render3/instructions.ts b/packages/core/src/render3/instructions.ts
index 65fd5b8d89..5aa343c5fb 100644
--- a/packages/core/src/render3/instructions.ts
+++ b/packages/core/src/render3/instructions.ts
@@ -10,13 +10,14 @@ import {resolveForwardRef} from '../di/forward_ref';
 import {InjectionToken} from '../di/injection_token';
 import {Injector} from '../di/injector';
 import {InjectFlags} from '../di/injector_compatibility';
+import {Type} from '../interface/type';
 import {QueryList} from '../linker';
 import {Sanitizer} from '../sanitization/security';
 import {StyleSanitizeFn} from '../sanitization/style_sanitizer';
-import {Type} from '../type';
+import {assertDataInRange, assertDefined, assertEqual, assertLessThan, assertNotEqual} from '../util/assert';
 import {normalizeDebugBindingName, normalizeDebugBindingValue} from '../util/ng_reflect';
 
-import {assertDataInRange, assertDefined, assertEqual, assertHasParent, assertLessThan, assertNotEqual, assertPreviousIsParent} from './assert';
+import {assertHasParent, assertPreviousIsParent} from './assert';
 import {bindingUpdated, bindingUpdated2, bindingUpdated3, bindingUpdated4} from './bindings';
 import {attachPatchData, getComponentViewByInstance} from './context_discovery';
 import {diPublicInInjector, getNodeInjectable, getOrCreateInjectable, getOrCreateNodeInjectorForNode, injectAttributeImpl} from './di';
diff --git a/packages/core/src/render3/interfaces/definition.ts b/packages/core/src/render3/interfaces/definition.ts
index 585cf49d69..2fa99bb932 100644
--- a/packages/core/src/render3/interfaces/definition.ts
+++ b/packages/core/src/render3/interfaces/definition.ts
@@ -7,7 +7,7 @@
  */
 
 import {ViewEncapsulation} from '../../core';
-import {Type} from '../../type';
+import {Type} from '../../interface/type';
 import {CssSelectorList} from './projection';
 
 
diff --git a/packages/core/src/render3/interfaces/injector.ts b/packages/core/src/render3/interfaces/injector.ts
index 64723e4243..dc1f660cb2 100644
--- a/packages/core/src/render3/interfaces/injector.ts
+++ b/packages/core/src/render3/interfaces/injector.ts
@@ -8,7 +8,7 @@
 
 import {InjectionToken} from '../../di/injection_token';
 import {InjectFlags} from '../../di/injector_compatibility';
-import {Type} from '../../type';
+import {Type} from '../../interface/type';
 import {TElementNode} from './node';
 import {LView, TData} from './view';
 
diff --git a/packages/core/src/render3/interfaces/query.ts b/packages/core/src/render3/interfaces/query.ts
index c69542a7de..9f8df300c2 100644
--- a/packages/core/src/render3/interfaces/query.ts
+++ b/packages/core/src/render3/interfaces/query.ts
@@ -6,10 +6,12 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../../interface/type';
 import {QueryList} from '../../linker';
-import {Type} from '../../type';
+
 import {TContainerNode, TElementContainerNode, TElementNode, TNode} from './node';
 
+
 /** Used for tracking queries (e.g. ViewChild, ContentChild). */
 export interface LQueries {
   /**
diff --git a/packages/core/src/render3/interfaces/view.ts b/packages/core/src/render3/interfaces/view.ts
index cb95730705..88ab31b085 100644
--- a/packages/core/src/render3/interfaces/view.ts
+++ b/packages/core/src/render3/interfaces/view.ts
@@ -8,9 +8,10 @@
 
 import {InjectionToken} from '../../di/injection_token';
 import {Injector} from '../../di/injector';
+import {Type} from '../../interface/type';
 import {QueryList} from '../../linker';
 import {Sanitizer} from '../../sanitization/security';
-import {Type} from '../../type';
+
 import {LContainer} from './container';
 import {ComponentDef, ComponentQuery, ComponentTemplate, DirectiveDef, DirectiveDefList, HostBindingsFunction, PipeDef, PipeDefList} from './definition';
 import {I18nUpdateOpCodes, TI18n} from './i18n';
@@ -21,6 +22,7 @@ import {RElement, Renderer3, RendererFactory3} from './renderer';
 import {StylingContext} from './styling';
 
 
+
 // Below are constants for LView indices to help us look up LView members
 // without having to remember the specific indices.
 // Uglify will inline these when minifying so there shouldn't be a cost.
diff --git a/packages/core/src/render3/jit/compiler_facade.ts b/packages/core/src/render3/jit/compiler_facade.ts
index 91a4b269c7..01205762c3 100644
--- a/packages/core/src/render3/jit/compiler_facade.ts
+++ b/packages/core/src/render3/jit/compiler_facade.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {global} from '../../util';
+import {global} from '../../util/global';
 import {CompilerFacade, ExportedCompilerFacade} from './compiler_facade_interface';
 export * from './compiler_facade_interface';
 
diff --git a/packages/core/src/render3/jit/directive.ts b/packages/core/src/render3/jit/directive.ts
index bb060abfee..26e4948689 100644
--- a/packages/core/src/render3/jit/directive.ts
+++ b/packages/core/src/render3/jit/directive.ts
@@ -8,11 +8,11 @@
 
 import {ComponentType} from '..';
 import {resolveForwardRef} from '../../di/forward_ref';
+import {Type} from '../../interface/type';
 import {Query} from '../../metadata/di';
 import {Component, Directive} from '../../metadata/directives';
 import {componentNeedsResolution, maybeQueueResolutionOfComponentResources} from '../../metadata/resource_loading';
 import {ViewEncapsulation} from '../../metadata/view';
-import {Type} from '../../type';
 import {EMPTY_ARRAY, EMPTY_OBJ} from '../empty';
 import {NG_COMPONENT_DEF, NG_DIRECTIVE_DEF} from '../fields';
 import {stringify} from '../util';
diff --git a/packages/core/src/render3/jit/environment.ts b/packages/core/src/render3/jit/environment.ts
index 6caff12a66..0eccfc4b75 100644
--- a/packages/core/src/render3/jit/environment.ts
+++ b/packages/core/src/render3/jit/environment.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {defineInjectable, defineInjector,} from '../../di/defs';
+import {defineInjectable, defineInjector,} from '../../di/interface/defs';
 import {inject} from '../../di/injector_compatibility';
 import * as r3 from '../index';
 import * as sanitization from '../../sanitization/sanitization';
diff --git a/packages/core/src/render3/jit/injectable.ts b/packages/core/src/render3/jit/injectable.ts
index 26f8b823e0..7454f0eed0 100644
--- a/packages/core/src/render3/jit/injectable.ts
+++ b/packages/core/src/render3/jit/injectable.ts
@@ -7,10 +7,10 @@
  */
 
 import {Injectable} from '../../di/injectable';
-import {ClassSansProvider, ExistingSansProvider, FactorySansProvider, ValueProvider, ValueSansProvider} from '../../di/provider';
-import {Type} from '../../type';
+import {NG_INJECTABLE_DEF} from '../../di/interface/defs';
+import {ClassSansProvider, ExistingSansProvider, FactorySansProvider, ValueProvider, ValueSansProvider} from '../../di/interface/provider';
+import {Type} from '../../interface/type';
 import {getClosureSafeProperty} from '../../util/property';
-import {NG_INJECTABLE_DEF} from '../fields';
 
 import {R3InjectableMetadataFacade, getCompilerFacade} from './compiler_facade';
 import {angularCoreEnv} from './environment';
diff --git a/packages/core/src/render3/jit/module.ts b/packages/core/src/render3/jit/module.ts
index 6585a17bb1..98c37b64f7 100644
--- a/packages/core/src/render3/jit/module.ts
+++ b/packages/core/src/render3/jit/module.ts
@@ -7,13 +7,14 @@
  */
 
 import {resolveForwardRef} from '../../di/forward_ref';
+import {NG_INJECTOR_DEF} from '../../di/interface/defs';
+import {Type} from '../../interface/type';
 import {registerNgModuleType} from '../../linker/ng_module_factory_loader';
 import {Component} from '../../metadata';
 import {ModuleWithProviders, NgModule, NgModuleDef, NgModuleTransitiveScopes} from '../../metadata/ng_module';
-import {Type} from '../../type';
-import {assertDefined} from '../assert';
+import {assertDefined} from '../../util/assert';
 import {getComponentDef, getDirectiveDef, getNgModuleDef, getPipeDef} from '../definition';
-import {NG_COMPONENT_DEF, NG_DIRECTIVE_DEF, NG_INJECTOR_DEF, NG_MODULE_DEF, NG_PIPE_DEF} from '../fields';
+import {NG_COMPONENT_DEF, NG_DIRECTIVE_DEF, NG_MODULE_DEF, NG_PIPE_DEF} from '../fields';
 import {ComponentDef} from '../interfaces/definition';
 import {NgModuleType} from '../ng_module_ref';
 import {stringify} from '../util';
diff --git a/packages/core/src/render3/jit/pipe.ts b/packages/core/src/render3/jit/pipe.ts
index 01ef332667..a03f565db9 100644
--- a/packages/core/src/render3/jit/pipe.ts
+++ b/packages/core/src/render3/jit/pipe.ts
@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../../interface/type';
 import {Pipe} from '../../metadata/directives';
-import {Type} from '../../type';
 import {NG_PIPE_DEF} from '../fields';
 import {stringify} from '../util';
 
diff --git a/packages/core/src/render3/jit/util.ts b/packages/core/src/render3/jit/util.ts
index 0bcc8da424..0851486c10 100644
--- a/packages/core/src/render3/jit/util.ts
+++ b/packages/core/src/render3/jit/util.ts
@@ -7,9 +7,9 @@
  */
 
 import {Host, Inject, Optional, Self, SkipSelf} from '../../di/metadata';
+import {Type} from '../../interface/type';
 import {Attribute} from '../../metadata/di';
 import {ReflectionCapabilities} from '../../reflection/reflection_capabilities';
-import {Type} from '../../type';
 
 import {CompilerFacade, R3DependencyMetadataFacade, getCompilerFacade} from './compiler_facade';
 
diff --git a/packages/core/src/render3/metadata.ts b/packages/core/src/render3/metadata.ts
index 19988e1d2f..bfa8e65a64 100644
--- a/packages/core/src/render3/metadata.ts
+++ b/packages/core/src/render3/metadata.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 
 interface TypeWithMetadata extends Type<any> {
   decorators?: any[];
diff --git a/packages/core/src/render3/ng_module_ref.ts b/packages/core/src/render3/ng_module_ref.ts
index ed82ed08bc..d4944bb232 100644
--- a/packages/core/src/render3/ng_module_ref.ts
+++ b/packages/core/src/render3/ng_module_ref.ts
@@ -8,15 +8,15 @@
 
 import {INJECTOR, Injector} from '../di/injector';
 import {InjectFlags} from '../di/injector_compatibility';
-import {StaticProvider} from '../di/provider';
+import {StaticProvider} from '../di/interface/provider';
 import {createInjector} from '../di/r3_injector';
+import {Type} from '../interface/type';
 import {ComponentFactoryResolver as viewEngine_ComponentFactoryResolver} from '../linker/component_factory_resolver';
 import {InternalNgModuleRef, NgModuleFactory as viewEngine_NgModuleFactory, NgModuleRef as viewEngine_NgModuleRef} from '../linker/ng_module_factory';
 import {NgModuleDef} from '../metadata/ng_module';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {assertDefined} from '../util/assert';
+import {stringify} from '../util/stringify';
 
-import {assertDefined} from './assert';
 import {ComponentFactoryResolver} from './component_ref';
 import {getNgModuleDef} from './definition';
 
diff --git a/packages/core/src/render3/node_assert.ts b/packages/core/src/render3/node_assert.ts
index a6c6229e3e..dc3e6198f3 100644
--- a/packages/core/src/render3/node_assert.ts
+++ b/packages/core/src/render3/node_assert.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {assertDefined, assertEqual} from './assert';
+import {assertDefined, assertEqual} from '../util/assert';
 import {TNode, TNodeType} from './interfaces/node';
 
 export function assertNodeType(tNode: TNode, type: TNodeType) {
diff --git a/packages/core/src/render3/node_selector_matcher.ts b/packages/core/src/render3/node_selector_matcher.ts
index ed56726ec4..065233674c 100644
--- a/packages/core/src/render3/node_selector_matcher.ts
+++ b/packages/core/src/render3/node_selector_matcher.ts
@@ -6,9 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import './ng_dev_mode';
+import '../util/ng_dev_mode';
 
-import {assertDefined, assertNotEqual} from './assert';
+import {assertDefined, assertNotEqual} from '../util/assert';
 import {AttributeMarker, TAttributes, TNode, TNodeType, unusedValueExportToPlacateAjd as unused1} from './interfaces/node';
 import {CssSelector, CssSelectorList, NG_PROJECT_AS_ATTR_NAME, SelectorFlags, unusedValueExportToPlacateAjd as unused2} from './interfaces/projection';
 
diff --git a/packages/core/src/render3/players.ts b/packages/core/src/render3/players.ts
index b703ac1baa..438b24cb5e 100644
--- a/packages/core/src/render3/players.ts
+++ b/packages/core/src/render3/players.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import './ng_dev_mode';
+import '../util/ng_dev_mode';
 
 import {getLContext} from './context_discovery';
 import {getRootContext} from './discovery_utils';
diff --git a/packages/core/src/render3/query.ts b/packages/core/src/render3/query.ts
index e27f432b64..8189023351 100644
--- a/packages/core/src/render3/query.ts
+++ b/packages/core/src/render3/query.ts
@@ -8,16 +8,14 @@
 
 // We are temporarily importing the existing viewEngine_from core so we can be sure we are
 // correctly implementing its interfaces for backwards compatibility.
-import {Observable} from 'rxjs';
 
-import {EventEmitter} from '../event_emitter';
+import {Type} from '../interface/type';
 import {ElementRef as ViewEngine_ElementRef} from '../linker/element_ref';
 import {QueryList} from '../linker/query_list';
 import {TemplateRef as ViewEngine_TemplateRef} from '../linker/template_ref';
-import {Type} from '../type';
-import {getSymbolIterator} from '../util';
+import {assertDefined, assertEqual} from '../util/assert';
 
-import {assertDefined, assertEqual, assertPreviousIsParent} from './assert';
+import {assertPreviousIsParent} from './assert';
 import {getNodeInjectable, locateDirectiveOrProvider} from './di';
 import {NG_ELEMENT_ID} from './fields';
 import {store, storeCleanupWithContext} from './instructions';
diff --git a/packages/core/src/render3/state.ts b/packages/core/src/render3/state.ts
index a1d7f296f1..123208d331 100644
--- a/packages/core/src/render3/state.ts
+++ b/packages/core/src/render3/state.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {assertDefined} from './assert';
+import {assertDefined} from '../util/assert';
 import {executeHooks} from './hooks';
 import {ComponentDef, DirectiveDef} from './interfaces/definition';
 import {TElementNode, TNode, TNodeFlags, TViewNode} from './interfaces/node';
diff --git a/packages/core/src/render3/styling/class_and_style_bindings.ts b/packages/core/src/render3/styling/class_and_style_bindings.ts
index a84d3b7041..7f4fb1465a 100644
--- a/packages/core/src/render3/styling/class_and_style_bindings.ts
+++ b/packages/core/src/render3/styling/class_and_style_bindings.ts
@@ -6,7 +6,7 @@
 * found in the LICENSE file at https://angular.io/license
 */
 import {StyleSanitizeFn} from '../../sanitization/style_sanitizer';
-import {assertNotEqual} from '../assert';
+import {assertNotEqual} from '../../util/assert';
 import {EMPTY_ARRAY, EMPTY_OBJ} from '../empty';
 import {AttributeMarker, TAttributes} from '../interfaces/node';
 import {BindingStore, BindingType, Player, PlayerBuilder, PlayerFactory, PlayerIndex} from '../interfaces/player';
@@ -20,6 +20,7 @@ import {BoundPlayerFactory} from './player_factory';
 import {addPlayerInternal, allocPlayerContext, createEmptyStylingContext, getPlayerContext} from './util';
 
 
+
 /**
  * This file includes the code to power all styling-binding operations in Angular.
  *
diff --git a/packages/core/src/render3/styling/util.ts b/packages/core/src/render3/styling/util.ts
index 16eb3d6e20..e2d9ee73c4 100644
--- a/packages/core/src/render3/styling/util.ts
+++ b/packages/core/src/render3/styling/util.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import '../ng_dev_mode';
+import '../../util/ng_dev_mode';
 
 import {StyleSanitizeFn} from '../../sanitization/style_sanitizer';
 import {getLContext} from '../context_discovery';
diff --git a/packages/core/src/render3/util.ts b/packages/core/src/render3/util.ts
index 440894bb26..583f30e517 100644
--- a/packages/core/src/render3/util.ts
+++ b/packages/core/src/render3/util.ts
@@ -6,9 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {global} from '../util';
+import {assertDataInRange, assertDefined, assertGreaterThan, assertLessThan} from '../util/assert';
+import {global} from '../util/global';
 
-import {assertDataInRange, assertDefined, assertGreaterThan, assertLessThan} from './assert';
 import {ACTIVE_INDEX, LCONTAINER_LENGTH, LContainer} from './interfaces/container';
 import {LContext, MONKEY_PATCH_KEY_NAME} from './interfaces/context';
 import {ComponentDef, DirectiveDef} from './interfaces/definition';
@@ -18,6 +18,7 @@ import {GlobalTargetName, GlobalTargetResolver, RComment, RElement, RText} from
 import {StylingContext} from './interfaces/styling';
 import {CONTEXT, DECLARATION_VIEW, FLAGS, HEADER_OFFSET, HOST, HOST_NODE, LView, LViewFlags, PARENT, RootContext, TData, TVIEW, TView} from './interfaces/view';
 
+
 /**
  * Returns whether the values are different from a change detection stand point.
  *
diff --git a/packages/core/src/render3/view_engine_compatibility.ts b/packages/core/src/render3/view_engine_compatibility.ts
index 700188433f..5baa501305 100644
--- a/packages/core/src/render3/view_engine_compatibility.ts
+++ b/packages/core/src/render3/view_engine_compatibility.ts
@@ -15,7 +15,7 @@ import {TemplateRef as ViewEngine_TemplateRef} from '../linker/template_ref';
 import {ViewContainerRef as ViewEngine_ViewContainerRef} from '../linker/view_container_ref';
 import {EmbeddedViewRef as viewEngine_EmbeddedViewRef, ViewRef as viewEngine_ViewRef} from '../linker/view_ref';
 import {Renderer2} from '../render/api';
-import {assertDefined, assertGreaterThan, assertLessThan} from './assert';
+import {assertDefined, assertGreaterThan, assertLessThan} from '../util/assert';
 import {NodeInjector, getParentInjectorLocation} from './di';
 import {addToViewTree, createEmbeddedViewAndNode, createLContainer, renderEmbeddedTemplate} from './instructions';
 import {ACTIVE_INDEX, LContainer, NATIVE, VIEWS} from './interfaces/container';
diff --git a/packages/core/src/sanitization/html_sanitizer.ts b/packages/core/src/sanitization/html_sanitizer.ts
index 1606524cea..eb39f31a13 100644
--- a/packages/core/src/sanitization/html_sanitizer.ts
+++ b/packages/core/src/sanitization/html_sanitizer.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isDevMode} from '../is_dev_mode';
+import {isDevMode} from '../util/is_dev_mode';
 import {InertBodyHelper} from './inert_body';
 import {_sanitizeUrl, sanitizeSrcset} from './url_sanitizer';
 
diff --git a/packages/core/src/sanitization/style_sanitizer.ts b/packages/core/src/sanitization/style_sanitizer.ts
index aef692fa89..62a6ecbe59 100644
--- a/packages/core/src/sanitization/style_sanitizer.ts
+++ b/packages/core/src/sanitization/style_sanitizer.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isDevMode} from '../is_dev_mode';
+import {isDevMode} from '../util/is_dev_mode';
 import {_sanitizeUrl} from './url_sanitizer';
 
 
diff --git a/packages/core/src/sanitization/url_sanitizer.ts b/packages/core/src/sanitization/url_sanitizer.ts
index 205443d91b..9cd29e1bb5 100644
--- a/packages/core/src/sanitization/url_sanitizer.ts
+++ b/packages/core/src/sanitization/url_sanitizer.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isDevMode} from '../is_dev_mode';
+import {isDevMode} from '../util/is_dev_mode';
 
 /**
  * A pattern that recognizes a commonly useful subset of URLs that are safe.
diff --git a/packages/core/src/testability/testability.ts b/packages/core/src/testability/testability.ts
index 229ca4f484..e555300bfb 100644
--- a/packages/core/src/testability/testability.ts
+++ b/packages/core/src/testability/testability.ts
@@ -7,7 +7,7 @@
  */
 
 import {Injectable} from '../di';
-import {scheduleMicroTask} from '../util';
+import {scheduleMicroTask} from '../util/microtask';
 import {NgZone} from '../zone/ng_zone';
 
 /**
diff --git a/packages/core/src/util.ts b/packages/core/src/util.ts
deleted file mode 100644
index 07a25685f8..0000000000
--- a/packages/core/src/util.ts
+++ /dev/null
@@ -1,111 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-// TODO(jteplitz602): Load WorkerGlobalScope from lib.webworker.d.ts file #3492
-declare var WorkerGlobalScope: any /** TODO #9100 */;
-// CommonJS / Node have global context exposed as "global" variable.
-// We don't want to include the whole node.d.ts this this compilation unit so we'll just fake
-// the global "global" var for now.
-declare var global: any /** TODO #9100 */;
-const __window = typeof window !== 'undefined' && window;
-const __self = typeof self !== 'undefined' && typeof WorkerGlobalScope !== 'undefined' &&
-    self instanceof WorkerGlobalScope && self;
-const __global = typeof global !== 'undefined' && global;
-
-// Check __global first, because in Node tests both __global and __window may be defined and _global
-// should be __global in that case.
-const _global: {[name: string]: any} = __global || __window || __self;
-
-const promise: Promise<any> = Promise.resolve(0);
-/**
- * Attention: whenever providing a new value, be sure to add an
- * entry into the corresponding `....externs.js` file,
- * so that closure won't use that global for its purposes.
- */
-export {_global as global};
-
-// When Symbol.iterator doesn't exist, retrieves the key used in es6-shim
-declare const Symbol: any;
-let _symbolIterator: any = null;
-export function getSymbolIterator(): string|symbol {
-  if (!_symbolIterator) {
-    const Symbol = _global['Symbol'];
-    if (Symbol && Symbol.iterator) {
-      _symbolIterator = Symbol.iterator;
-    } else {
-      // es6-shim specific logic
-      const keys = Object.getOwnPropertyNames(Map.prototype);
-      for (let i = 0; i < keys.length; ++i) {
-        const key = keys[i];
-        if (key !== 'entries' && key !== 'size' &&
-            (Map as any).prototype[key] === Map.prototype['entries']) {
-          _symbolIterator = key;
-        }
-      }
-    }
-  }
-  return _symbolIterator;
-}
-
-export function scheduleMicroTask(fn: Function) {
-  if (typeof Zone === 'undefined') {
-    // use promise to schedule microTask instead of use Zone
-    promise.then(() => { fn && fn.apply(null, null); });
-  } else {
-    Zone.current.scheduleMicroTask('scheduleMicrotask', fn);
-  }
-}
-
-// JS has NaN !== NaN
-export function looseIdentical(a: any, b: any): boolean {
-  return a === b || typeof a === 'number' && typeof b === 'number' && isNaN(a) && isNaN(b);
-}
-
-export function stringify(token: any): string {
-  if (typeof token === 'string') {
-    return token;
-  }
-
-  if (token instanceof Array) {
-    return '[' + token.map(stringify).join(', ') + ']';
-  }
-
-  if (token == null) {
-    return '' + token;
-  }
-
-  if (token.overriddenName) {
-    return `${token.overriddenName}`;
-  }
-
-  if (token.name) {
-    return `${token.name}`;
-  }
-
-  const res = token.toString();
-
-  if (res == null) {
-    return '' + res;
-  }
-
-  const newLineIndex = res.indexOf('\n');
-  return newLineIndex === -1 ? res : res.substring(0, newLineIndex);
-}
-
-/**
- * Convince closure compiler that the wrapped function has no side-effects.
- *
- * Closure compiler always assumes that `toString` has no side-effects. We use this quirk to
- * allow us to execute a function but have closure compiler mark the call as no-side-effects.
- * It is important that the return value for the `noSideEffects` function be assigned
- * to something which is retained otherwise the call to `noSideEffects` will be removed by closure
- * compiler.
- */
-export function noSideEffects(fn: () => void): string {
-  return '' + {toString: fn};
-}
\ No newline at end of file
diff --git a/packages/core/src/util/BUILD.bazel b/packages/core/src/util/BUILD.bazel
new file mode 100644
index 0000000000..b1ffe3cc0d
--- /dev/null
+++ b/packages/core/src/util/BUILD.bazel
@@ -0,0 +1,21 @@
+package(default_visibility = [
+    "//packages/core:__subpackages__",
+    "//tools/public_api_guard:__pkg__",
+])
+
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "util",
+    srcs = glob(
+        [
+            "**/*.ts",
+        ],
+    ),
+    module_name = "@angular/core/util",
+    deps = [
+        "//packages/core/src/interface",
+        "@rxjs",
+        "@rxjs//operators",
+    ],
+)
diff --git a/packages/core/src/util/WrappedValue.ts b/packages/core/src/util/WrappedValue.ts
new file mode 100644
index 0000000000..48e5e3f76b
--- /dev/null
+++ b/packages/core/src/util/WrappedValue.ts
@@ -0,0 +1,46 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * Indicates that the result of a {@link Pipe} transformation has changed even though the
+ * reference has not changed.
+ *
+ * Wrapped values are unwrapped automatically during the change detection, and the unwrapped value
+ * is stored.
+ *
+ * Example:
+ *
+ * ```
+ * if (this._latestValue === this._latestReturnedValue) {
+ *    return this._latestReturnedValue;
+ *  } else {
+ *    this._latestReturnedValue = this._latestValue;
+ *    return WrappedValue.wrap(this._latestValue); // this will force update
+ *  }
+ * ```
+ *
+ * @publicApi
+ */
+export class WrappedValue {
+  /** @deprecated from 5.3, use `unwrap()` instead - will switch to protected */
+  wrapped: any;
+
+  constructor(value: any) { this.wrapped = value; }
+
+  /** Creates a wrapped value. */
+  static wrap(value: any): WrappedValue { return new WrappedValue(value); }
+
+  /**
+   * Returns the underlying value of a wrapped value.
+   * Returns the given `value` when it is not wrapped.
+   **/
+  static unwrap(value: any): any { return WrappedValue.isWrapped(value) ? value.wrapped : value; }
+
+  /** Returns true if `value` is a wrapped value. */
+  static isWrapped(value: any): value is WrappedValue { return value instanceof WrappedValue; }
+}
diff --git a/packages/core/src/util/assert.ts b/packages/core/src/util/assert.ts
new file mode 100644
index 0000000000..16a2466040
--- /dev/null
+++ b/packages/core/src/util/assert.ts
@@ -0,0 +1,74 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// The functions in this file verify that the assumptions we are making
+// about state in an instruction are correct before implementing any logic.
+// They are meant only to be called in dev mode as sanity checks.
+
+export function assertNumber(actual: any, msg: string) {
+  if (typeof actual != 'number') {
+    throwError(msg);
+  }
+}
+
+export function assertEqual<T>(actual: T, expected: T, msg: string) {
+  if (actual != expected) {
+    throwError(msg);
+  }
+}
+
+export function assertNotEqual<T>(actual: T, expected: T, msg: string) {
+  if (actual == expected) {
+    throwError(msg);
+  }
+}
+
+export function assertSame<T>(actual: T, expected: T, msg: string) {
+  if (actual !== expected) {
+    throwError(msg);
+  }
+}
+
+export function assertLessThan<T>(actual: T, expected: T, msg: string) {
+  if (actual >= expected) {
+    throwError(msg);
+  }
+}
+
+export function assertGreaterThan<T>(actual: T, expected: T, msg: string) {
+  if (actual <= expected) {
+    throwError(msg);
+  }
+}
+
+export function assertNotDefined<T>(actual: T, msg: string) {
+  if (actual != null) {
+    throwError(msg);
+  }
+}
+
+export function assertDefined<T>(actual: T, msg: string) {
+  if (actual == null) {
+    throwError(msg);
+  }
+}
+
+export function throwError(msg: string): never {
+  // tslint:disable-next-line
+  debugger;  // Left intentionally for better debugger experience.
+  throw new Error(`ASSERTION ERROR: ${msg}`);
+}
+
+export function assertDomNode(node: any) {
+  assertEqual(node instanceof Node, true, 'The provided value must be an instance of a DOM Node');
+}
+
+
+export function assertDataInRange(arr: any[], index: number) {
+  assertLessThan(index, arr ? arr.length : 0, 'index expected to be a valid data index');
+}
diff --git a/packages/core/src/util/closure.ts b/packages/core/src/util/closure.ts
new file mode 100644
index 0000000000..de36d31b0d
--- /dev/null
+++ b/packages/core/src/util/closure.ts
@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * Convince closure compiler that the wrapped function has no side-effects.
+ *
+ * Closure compiler always assumes that `toString` has no side-effects. We use this quirk to
+ * allow us to execute a function but have closure compiler mark the call as no-side-effects.
+ * It is important that the return value for the `noSideEffects` function be assigned
+ * to something which is retained otherwise the call to `noSideEffects` will be removed by closure
+ * compiler.
+ */
+export function noSideEffects(fn: () => void): string {
+  return '' + {toString: fn};
+}
\ No newline at end of file
diff --git a/packages/core/src/util/comparison.ts b/packages/core/src/util/comparison.ts
new file mode 100644
index 0000000000..e726d8fa8f
--- /dev/null
+++ b/packages/core/src/util/comparison.ts
@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {areIterablesEqual, isListLikeIterable} from './iterable';
+
+
+// JS has NaN !== NaN
+export function looseIdentical(a: any, b: any): boolean {
+  return a === b || typeof a === 'number' && typeof b === 'number' && isNaN(a) && isNaN(b);
+}
+
+export function devModeEqual(a: any, b: any): boolean {
+  const isListLikeIterableA = isListLikeIterable(a);
+  const isListLikeIterableB = isListLikeIterable(b);
+  if (isListLikeIterableA && isListLikeIterableB) {
+    return areIterablesEqual(a, b, devModeEqual);
+  } else {
+    const isAObject = a && (typeof a === 'object' || typeof a === 'function');
+    const isBObject = b && (typeof b === 'object' || typeof b === 'function');
+    if (!isListLikeIterableA && isAObject && !isListLikeIterableB && isBObject) {
+      return true;
+    } else {
+      return looseIdentical(a, b);
+    }
+  }
+}
diff --git a/packages/core/src/util/decorators.ts b/packages/core/src/util/decorators.ts
index 506579f24b..907f4b9695 100644
--- a/packages/core/src/util/decorators.ts
+++ b/packages/core/src/util/decorators.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Type} from '../type';
+import {Type} from '../interface/type';
 
 /**
  * An interface implemented by all Angular type decorators, which allows them to be used as ES7
diff --git a/packages/core/src/util/empty.ts b/packages/core/src/util/empty.ts
new file mode 100644
index 0000000000..46dc61bdf6
--- /dev/null
+++ b/packages/core/src/util/empty.ts
@@ -0,0 +1,24 @@
+/**
+* @license
+* Copyright Google Inc. All Rights Reserved.
+*
+* Use of this source code is governed by an MIT-style license that can be
+* found in the LICENSE file at https://angular.io/license
+*/
+import './ng_dev_mode';
+
+/**
+ * This file contains reuseable "empty" symbols that can be used as default return values
+ * in different parts of the rendering code. Because the same symbols are returned, this
+ * allows for identity checks against these values to be consistently used by the framework
+ * code.
+ */
+
+export const EMPTY_OBJ: {} = {};
+export const EMPTY_ARRAY: any[] = [];
+
+// freezing the values prevents any code from accidentally inserting new values in
+if (typeof ngDevMode !== 'undefined' && ngDevMode) {
+  Object.freeze(EMPTY_OBJ);
+  Object.freeze(EMPTY_ARRAY);
+}
diff --git a/packages/core/src/util/errors.ts b/packages/core/src/util/errors.ts
new file mode 100644
index 0000000000..7f895c4420
--- /dev/null
+++ b/packages/core/src/util/errors.ts
@@ -0,0 +1,21 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export const ERROR_TYPE = 'ngType';
+export const ERROR_DEBUG_CONTEXT = 'ngDebugContext';
+export const ERROR_ORIGINAL_ERROR = 'ngOriginalError';
+export const ERROR_LOGGER = 'ngErrorLogger';
+
+
+export function wrappedError(message: string, originalError: any): Error {
+  const msg =
+      `${message} caused by: ${originalError instanceof Error ? originalError.message: originalError }`;
+  const error = Error(msg);
+  (error as any)[ERROR_ORIGINAL_ERROR] = originalError;
+  return error;
+}
diff --git a/packages/core/src/util/forward_ref.ts b/packages/core/src/util/forward_ref.ts
new file mode 100644
index 0000000000..89e53dd337
--- /dev/null
+++ b/packages/core/src/util/forward_ref.ts
@@ -0,0 +1,67 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Type} from '../interface/type';
+import {getClosureSafeProperty} from './property';
+import {stringify} from './stringify';
+
+
+
+/**
+ * An interface that a function passed into {@link forwardRef} has to implement.
+ *
+ * @usageNotes
+ * ### Example
+ *
+ * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref_fn'}
+ * @publicApi
+ */
+export interface ForwardRefFn { (): any; }
+
+const __forward_ref__ = getClosureSafeProperty({__forward_ref__: getClosureSafeProperty});
+
+/**
+ * Allows to refer to references which are not yet defined.
+ *
+ * For instance, `forwardRef` is used when the `token` which we need to refer to for the purposes of
+ * DI is declared, but not yet defined. It is also used when the `token` which we use when creating
+ * a query is not yet defined.
+ *
+ * @usageNotes
+ * ### Example
+ * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref'}
+ * @publicApi
+ */
+export function forwardRef(forwardRefFn: ForwardRefFn): Type<any> {
+  (<any>forwardRefFn).__forward_ref__ = forwardRef;
+  (<any>forwardRefFn).toString = function() { return stringify(this()); };
+  return (<Type<any>><any>forwardRefFn);
+}
+
+/**
+ * Lazily retrieves the reference value from a forwardRef.
+ *
+ * Acts as the identity function when given a non-forward-ref value.
+ *
+ * @usageNotes
+ * ### Example
+ *
+ * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='resolve_forward_ref'}
+ *
+ * @see `forwardRef`
+ * @publicApi
+ */
+export function resolveForwardRef<T>(type: T): T {
+  const fn: any = type;
+  if (typeof fn === 'function' && fn.hasOwnProperty(__forward_ref__) &&
+      fn.__forward_ref__ === forwardRef) {
+    return fn();
+  } else {
+    return type;
+  }
+}
diff --git a/packages/core/src/util/global.ts b/packages/core/src/util/global.ts
new file mode 100644
index 0000000000..15674cc123
--- /dev/null
+++ b/packages/core/src/util/global.ts
@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// TODO(jteplitz602): Load WorkerGlobalScope from lib.webworker.d.ts file #3492
+declare var WorkerGlobalScope: any /** TODO #9100 */;
+// CommonJS / Node have global context exposed as "global" variable.
+// We don't want to include the whole node.d.ts this this compilation unit so we'll just fake
+// the global "global" var for now.
+declare var global: any /** TODO #9100 */;
+const __window = typeof window !== 'undefined' && window;
+const __self = typeof self !== 'undefined' && typeof WorkerGlobalScope !== 'undefined' &&
+    self instanceof WorkerGlobalScope && self;
+const __global = typeof global !== 'undefined' && global;
+
+// Check __global first, because in Node tests both __global and __window may be defined and _global
+// should be __global in that case.
+const _global: {[name: string]: any} = __global || __window || __self;
+
+/**
+ * Attention: whenever providing a new value, be sure to add an
+ * entry into the corresponding `....externs.js` file,
+ * so that closure won't use that global for its purposes.
+ */
+export {_global as global};
diff --git a/packages/core/src/is_dev_mode.ts b/packages/core/src/util/is_dev_mode.ts
similarity index 100%
rename from packages/core/src/is_dev_mode.ts
rename to packages/core/src/util/is_dev_mode.ts
diff --git a/packages/core/src/util/iterable.ts b/packages/core/src/util/iterable.ts
new file mode 100644
index 0000000000..4f85e0cbdc
--- /dev/null
+++ b/packages/core/src/util/iterable.ts
@@ -0,0 +1,49 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {getSymbolIterator} from './symbol';
+
+
+export function isListLikeIterable(obj: any): boolean {
+  if (!isJsObject(obj)) return false;
+  return Array.isArray(obj) ||
+      (!(obj instanceof Map) &&      // JS Map are iterables but return entries as [k, v]
+       getSymbolIterator() in obj);  // JS Iterable have a Symbol.iterator prop
+}
+
+export function areIterablesEqual(
+    a: any, b: any, comparator: (a: any, b: any) => boolean): boolean {
+  const iterator1 = a[getSymbolIterator()]();
+  const iterator2 = b[getSymbolIterator()]();
+
+  while (true) {
+    const item1 = iterator1.next();
+    const item2 = iterator2.next();
+    if (item1.done && item2.done) return true;
+    if (item1.done || item2.done) return false;
+    if (!comparator(item1.value, item2.value)) return false;
+  }
+}
+
+export function iterateListLike(obj: any, fn: (p: any) => any) {
+  if (Array.isArray(obj)) {
+    for (let i = 0; i < obj.length; i++) {
+      fn(obj[i]);
+    }
+  } else {
+    const iterator = obj[getSymbolIterator()]();
+    let item: any;
+    while (!((item = iterator.next()).done)) {
+      fn(item.value);
+    }
+  }
+}
+
+export function isJsObject(o: any): boolean {
+  return o !== null && (typeof o === 'function' || typeof o === 'object');
+}
diff --git a/packages/core/src/util/microtask.ts b/packages/core/src/util/microtask.ts
new file mode 100644
index 0000000000..40edbac49d
--- /dev/null
+++ b/packages/core/src/util/microtask.ts
@@ -0,0 +1,21 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+
+const promise: Promise<any> = Promise.resolve(0);
+
+declare const Zone: any;
+
+export function scheduleMicroTask(fn: Function) {
+  if (typeof Zone === 'undefined') {
+    // use promise to schedule microTask instead of use Zone
+    promise.then(() => { fn && fn.apply(null, null); });
+  } else {
+    Zone.current.scheduleMicroTask('scheduleMicrotask', fn);
+  }
+}
diff --git a/packages/core/src/render3/ng_dev_mode.ts b/packages/core/src/util/ng_dev_mode.ts
similarity index 100%
rename from packages/core/src/render3/ng_dev_mode.ts
rename to packages/core/src/util/ng_dev_mode.ts
diff --git a/packages/core/src/util/stringify.ts b/packages/core/src/util/stringify.ts
new file mode 100644
index 0000000000..0af107a1f4
--- /dev/null
+++ b/packages/core/src/util/stringify.ts
@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export function stringify(token: any): string {
+  if (typeof token === 'string') {
+    return token;
+  }
+
+  if (token instanceof Array) {
+    return '[' + token.map(stringify).join(', ') + ']';
+  }
+
+  if (token == null) {
+    return '' + token;
+  }
+
+  if (token.overriddenName) {
+    return `${token.overriddenName}`;
+  }
+
+  if (token.name) {
+    return `${token.name}`;
+  }
+
+  const res = token.toString();
+
+  if (res == null) {
+    return '' + res;
+  }
+
+  const newLineIndex = res.indexOf('\n');
+  return newLineIndex === -1 ? res : res.substring(0, newLineIndex);
+}
diff --git a/packages/core/src/util/symbol.ts b/packages/core/src/util/symbol.ts
new file mode 100644
index 0000000000..71dc7edec7
--- /dev/null
+++ b/packages/core/src/util/symbol.ts
@@ -0,0 +1,32 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {global as _global} from './global';
+
+// When Symbol.iterator doesn't exist, retrieves the key used in es6-shim
+declare const Symbol: any;
+let _symbolIterator: any = null;
+export function getSymbolIterator(): string|symbol {
+  if (!_symbolIterator) {
+    const Symbol = _global['Symbol'];
+    if (Symbol && Symbol.iterator) {
+      _symbolIterator = Symbol.iterator;
+    } else {
+      // es6-shim specific logic
+      const keys = Object.getOwnPropertyNames(Map.prototype);
+      for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (key !== 'entries' && key !== 'size' &&
+            (Map as any).prototype[key] === Map.prototype['entries']) {
+          _symbolIterator = key;
+        }
+      }
+    }
+  }
+  return _symbolIterator;
+}
diff --git a/packages/core/src/view/entrypoint.ts b/packages/core/src/view/entrypoint.ts
index ff2933baf1..7786cae734 100644
--- a/packages/core/src/view/entrypoint.ts
+++ b/packages/core/src/view/entrypoint.ts
@@ -7,9 +7,9 @@
  */
 
 import {Injector} from '../di/injector';
+import {Type} from '../interface/type';
 import {ComponentFactory} from '../linker/component_factory';
 import {NgModuleFactory, NgModuleRef} from '../linker/ng_module_factory';
-import {Type} from '../type';
 
 import {initServicesIfNeeded} from './services';
 import {NgModuleDefinition, NgModuleDefinitionFactory, NgModuleProviderDef, ProviderOverride, Services, ViewDefinition} from './types';
diff --git a/packages/core/src/view/errors.ts b/packages/core/src/view/errors.ts
index 96df939fdd..d7ded67a01 100644
--- a/packages/core/src/view/errors.ts
+++ b/packages/core/src/view/errors.ts
@@ -6,8 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ERROR_DEBUG_CONTEXT, ERROR_LOGGER, getDebugContext} from '../errors';
-import {DebugContext, ViewState} from './types';
+import {getDebugContext} from '../errors';
+import {ERROR_DEBUG_CONTEXT, ERROR_LOGGER} from '../util/errors';
+
+import {DebugContext} from './types';
 
 export function expressionChangedAfterItHasBeenCheckedError(
     context: DebugContext, oldValue: any, currValue: any, isFirstCheck: boolean): Error {
diff --git a/packages/core/src/view/ng_module.ts b/packages/core/src/view/ng_module.ts
index 50c3c6022b..cfd5462e92 100644
--- a/packages/core/src/view/ng_module.ts
+++ b/packages/core/src/view/ng_module.ts
@@ -6,13 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {InjectableDef, getInjectableDef} from '../di/defs';
 import {resolveForwardRef} from '../di/forward_ref';
 import {INJECTOR, Injector} from '../di/injector';
 import {setCurrentInjector} from '../di/injector_compatibility';
+import {InjectableDef, getInjectableDef} from '../di/interface/defs';
 import {APP_ROOT} from '../di/scope';
 import {NgModuleRef} from '../linker/ng_module_factory';
-import {stringify} from '../util';
+import {stringify} from '../util/stringify';
 
 import {DepDef, DepFlags, NgModuleData, NgModuleDefinition, NgModuleProviderDef, NodeFlags} from './types';
 import {splitDepsDsl, tokenKey} from './util';
diff --git a/packages/core/src/view/provider.ts b/packages/core/src/view/provider.ts
index 83e046ce53..0774765dca 100644
--- a/packages/core/src/view/provider.ts
+++ b/packages/core/src/view/provider.ts
@@ -12,8 +12,8 @@ import {ElementRef} from '../linker/element_ref';
 import {TemplateRef} from '../linker/template_ref';
 import {ViewContainerRef} from '../linker/view_container_ref';
 import {Renderer as RendererV1, Renderer2} from '../render/api';
-import {stringify} from '../util';
 import {isObservable} from '../util/lang';
+import {stringify} from '../util/stringify';
 
 import {createChangeDetectorRef, createInjector, createRendererV1} from './refs';
 import {BindingDef, BindingFlags, DepDef, DepFlags, NodeDef, NodeFlags, OutputDef, OutputType, ProviderData, QueryValueType, Services, ViewData, ViewFlags, ViewState, asElementData, asProviderData, shouldCallLifecycleInitHook} from './types';
diff --git a/packages/core/src/view/refs.ts b/packages/core/src/view/refs.ts
index 0203fdd98a..4dcc5e2f78 100644
--- a/packages/core/src/view/refs.ts
+++ b/packages/core/src/view/refs.ts
@@ -10,6 +10,7 @@ import {ApplicationRef} from '../application_ref';
 import {ChangeDetectorRef} from '../change_detection/change_detection';
 import {Injector} from '../di/injector';
 import {InjectFlags} from '../di/injector_compatibility';
+import {Type} from '../interface/type';
 import {ComponentFactory, ComponentRef} from '../linker/component_factory';
 import {ComponentFactoryBoundToModule, ComponentFactoryResolver} from '../linker/component_factory_resolver';
 import {ElementRef} from '../linker/element_ref';
@@ -18,8 +19,7 @@ import {TemplateRef} from '../linker/template_ref';
 import {ViewContainerRef} from '../linker/view_container_ref';
 import {EmbeddedViewRef, InternalViewRef, ViewRef} from '../linker/view_ref';
 import {Renderer as RendererV1, Renderer2} from '../render/api';
-import {Type} from '../type';
-import {stringify} from '../util';
+import {stringify} from '../util/stringify';
 import {VERSION} from '../version';
 
 import {callNgModuleLifecycle, initNgModule, resolveNgModuleDep} from './ng_module';
diff --git a/packages/core/src/view/services.ts b/packages/core/src/view/services.ts
index 53e93f6b6d..7906b696c0 100644
--- a/packages/core/src/view/services.ts
+++ b/packages/core/src/view/services.ts
@@ -8,16 +8,17 @@
 
 import {DebugElement__PRE_R3__, DebugNode__PRE_R3__, EventListener, getDebugNode, indexDebugNode, removeDebugNodeFromIndex} from '../debug/debug_node';
 import {Injector} from '../di';
-import {InjectableDef, getInjectableDef} from '../di/defs';
 import {InjectableType} from '../di/injectable';
+import {InjectableDef, getInjectableDef} from '../di/interface/defs';
 import {ErrorHandler} from '../error_handler';
-import {isDevMode} from '../is_dev_mode';
+import {Type} from '../interface/type';
 import {ComponentFactory} from '../linker/component_factory';
 import {NgModuleRef} from '../linker/ng_module_factory';
 import {Renderer2, RendererFactory2, RendererStyleFlags2, RendererType2} from '../render/api';
 import {Sanitizer} from '../sanitization/security';
-import {Type} from '../type';
+import {isDevMode} from '../util/is_dev_mode';
 import {normalizeDebugBindingName, normalizeDebugBindingValue} from '../util/ng_reflect';
+
 import {isViewDebugError, viewDestroyedError, viewWrappedDebugError} from './errors';
 import {resolveDep} from './provider';
 import {dirtyParentQueries, getQueryValue} from './query';
diff --git a/packages/core/src/view/types.ts b/packages/core/src/view/types.ts
index 870a7df872..0f43c13274 100644
--- a/packages/core/src/view/types.ts
+++ b/packages/core/src/view/types.ts
@@ -8,6 +8,7 @@
 
 import {Injector} from '../di';
 import {ErrorHandler} from '../error_handler';
+import {Type} from '../interface/type';
 import {ComponentFactory} from '../linker/component_factory';
 import {NgModuleRef} from '../linker/ng_module_factory';
 import {QueryList} from '../linker/query_list';
@@ -15,7 +16,7 @@ import {TemplateRef} from '../linker/template_ref';
 import {ViewContainerRef} from '../linker/view_container_ref';
 import {Renderer2, RendererFactory2, RendererType2} from '../render/api';
 import {Sanitizer, SecurityContext} from '../sanitization/security';
-import {Type} from '../type';
+
 
 
 // -------------------------------------
diff --git a/packages/core/src/view/util.ts b/packages/core/src/view/util.ts
index eade00199e..aaeec68753 100644
--- a/packages/core/src/view/util.ts
+++ b/packages/core/src/view/util.ts
@@ -10,7 +10,8 @@ import {WrappedValue, devModeEqual} from '../change_detection/change_detection';
 import {SOURCE} from '../di/injector';
 import {ViewEncapsulation} from '../metadata/view';
 import {RendererType2} from '../render/api';
-import {looseIdentical, stringify} from '../util';
+import {looseIdentical} from '../util/comparison';
+import {stringify} from '../util/stringify';
 import {expressionChangedAfterItHasBeenCheckedError} from './errors';
 import {BindingDef, BindingFlags, Definition, DefinitionFactory, DepDef, DepFlags, ElementData, NodeDef, NodeFlags, QueryValueType, Services, ViewData, ViewDefinition, ViewDefinitionFactory, ViewFlags, ViewState, asElementData, asTextData} from './types';
 
diff --git a/packages/core/test/BUILD.bazel b/packages/core/test/BUILD.bazel
index 8d066f005b..6a5e4a5fcc 100644
--- a/packages/core/test/BUILD.bazel
+++ b/packages/core/test/BUILD.bazel
@@ -19,6 +19,9 @@ ts_library(
         "//packages/compiler",
         "//packages/compiler/testing",
         "//packages/core",
+        "//packages/core/src/di/interface",
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
         "//packages/core/testing",
         "//packages/platform-browser",
         "//packages/platform-browser-dynamic",
diff --git a/packages/core/test/bundling/todo/bundle.golden_symbols.json b/packages/core/test/bundling/todo/bundle.golden_symbols.json
index 3cc4e94ef6..c1e32f2570 100644
--- a/packages/core/test/bundling/todo/bundle.golden_symbols.json
+++ b/packages/core/test/bundling/todo/bundle.golden_symbols.json
@@ -906,13 +906,13 @@
     "name": "isFactory"
   },
   {
-    "name": "isJsObject"
+    "name": "isJsObject$1"
   },
   {
     "name": "isLContainer"
   },
   {
-    "name": "isListLikeIterable"
+    "name": "isListLikeIterable$1"
   },
   {
     "name": "isNodeMatchingSelector"
@@ -933,7 +933,7 @@
     "name": "isStylingContext"
   },
   {
-    "name": "iterateListLike"
+    "name": "iterateListLike$1"
   },
   {
     "name": "leaveView"
diff --git a/packages/core/test/change_detection/iterable.ts b/packages/core/test/change_detection/iterable.ts
index b78de13bf9..97e2401bcd 100644
--- a/packages/core/test/change_detection/iterable.ts
+++ b/packages/core/test/change_detection/iterable.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {getSymbolIterator} from '@angular/core/src/util';
+import {getSymbolIterator} from '@angular/core/src/util/symbol';
 
 export class TestIterable {
   list: number[];
diff --git a/packages/core/test/change_detection/util.ts b/packages/core/test/change_detection/util.ts
index 2a6b28f8d5..97d68f52dc 100644
--- a/packages/core/test/change_detection/util.ts
+++ b/packages/core/test/change_detection/util.ts
@@ -9,7 +9,8 @@
 import {IterableChangeRecord, IterableChanges} from '@angular/core/src/change_detection/differs/iterable_differs';
 import {KeyValueChangeRecord, KeyValueChanges} from '@angular/core/src/change_detection/differs/keyvalue_differs';
 
-import {looseIdentical, stringify} from '../../src/util';
+import {looseIdentical} from '../../src/util/comparison';
+import {stringify} from '../../src/util/stringify';
 
 export function iterableDifferToString<V>(iterableChanges: IterableChanges<V>) {
   const collection: string[] = [];
diff --git a/packages/core/test/di/r3_injector_spec.ts b/packages/core/test/di/r3_injector_spec.ts
index df1311a75c..ad9eebad58 100644
--- a/packages/core/test/di/r3_injector_spec.ts
+++ b/packages/core/test/di/r3_injector_spec.ts
@@ -6,10 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {defineInjectable, defineInjector} from '../../src/di/defs';
 import {InjectionToken} from '../../src/di/injection_token';
 import {INJECTOR, Injector} from '../../src/di/injector';
 import {inject} from '../../src/di/injector_compatibility';
+import {defineInjectable, defineInjector} from '../../src/di/interface/defs';
 import {R3Injector, createInjector} from '../../src/di/r3_injector';
 
 describe('InjectorDef-based createInjector()', () => {
diff --git a/packages/core/test/di/reflective_injector_spec.ts b/packages/core/test/di/reflective_injector_spec.ts
index 28bfc0aca7..139f8d1eab 100644
--- a/packages/core/test/di/reflective_injector_spec.ts
+++ b/packages/core/test/di/reflective_injector_spec.ts
@@ -11,7 +11,7 @@ import {ReflectiveInjector_} from '@angular/core/src/di/reflective_injector';
 import {ResolvedReflectiveProvider_} from '@angular/core/src/di/reflective_provider';
 import {getOriginalError} from '@angular/core/src/errors';
 import {expect} from '@angular/platform-browser/testing/src/matchers';
-import {stringify} from '../../src/util';
+import {stringify} from '../../src/util/stringify';
 
 class Engine {}
 
diff --git a/packages/core/test/di/static_injector_spec.ts b/packages/core/test/di/static_injector_spec.ts
index c00c8fa97c..1ae7386d7b 100644
--- a/packages/core/test/di/static_injector_spec.ts
+++ b/packages/core/test/di/static_injector_spec.ts
@@ -10,7 +10,7 @@ import {Inject, InjectionToken, Injector, Optional, ReflectiveKey, Self, SkipSel
 import {getOriginalError} from '@angular/core/src/errors';
 import {expect} from '@angular/platform-browser/testing/src/matchers';
 
-import {stringify} from '../../src/util';
+import {stringify} from '../../src/util/stringify';
 
 class Engine {
   static PROVIDER = {provide: Engine, useClass: Engine, deps: []};
diff --git a/packages/core/test/error_handler_spec.ts b/packages/core/test/error_handler_spec.ts
index 69d4249544..682e7b582d 100644
--- a/packages/core/test/error_handler_spec.ts
+++ b/packages/core/test/error_handler_spec.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ERROR_DEBUG_CONTEXT, ERROR_LOGGER, ERROR_TYPE} from '@angular/core/src/errors';
+import {ERROR_DEBUG_CONTEXT, ERROR_LOGGER, ERROR_TYPE} from '@angular/core/src/util/errors';
 
 import {ErrorHandler, wrappedError} from '../src/error_handler';
 
diff --git a/packages/core/test/linker/integration_spec.ts b/packages/core/test/linker/integration_spec.ts
index ade34f8038..ae444e8fa9 100644
--- a/packages/core/test/linker/integration_spec.ts
+++ b/packages/core/test/linker/integration_spec.ts
@@ -24,7 +24,7 @@ import {dispatchEvent, el} from '@angular/platform-browser/testing/src/browser_u
 import {expect} from '@angular/platform-browser/testing/src/matchers';
 import {fixmeIvy, modifiedInIvy, obsoleteInIvy} from '@angular/private/testing';
 
-import {stringify} from '../../src/util';
+import {stringify} from '../../src/util/stringify';
 
 const ANCHOR_ELEMENT = new InjectionToken('AnchorElement');
 
diff --git a/packages/core/test/linker/ng_module_integration_spec.ts b/packages/core/test/linker/ng_module_integration_spec.ts
index 239f415a99..36c52354dc 100644
--- a/packages/core/test/linker/ng_module_integration_spec.ts
+++ b/packages/core/test/linker/ng_module_integration_spec.ts
@@ -8,7 +8,7 @@
 
 import {ANALYZE_FOR_ENTRY_COMPONENTS, CUSTOM_ELEMENTS_SCHEMA, Compiler, Component, ComponentFactoryResolver, Directive, HostBinding, Inject, Injectable, InjectionToken, Injector, Input, NgModule, NgModuleRef, Optional, Pipe, Provider, Self, Type, forwardRef, getModuleFactory, ɵivyEnabled as ivyEnabled} from '@angular/core';
 import {Console} from '@angular/core/src/console';
-import {InjectableDef, defineInjectable} from '@angular/core/src/di/defs';
+import {InjectableDef, defineInjectable} from '@angular/core/src/di/interface/defs';
 import {getNgModuleDef} from '@angular/core/src/render3/definition';
 import {NgModuleData} from '@angular/core/src/view/types';
 import {tokenKey} from '@angular/core/src/view/util';
@@ -18,7 +18,7 @@ import {fixmeIvy, modifiedInIvy, obsoleteInIvy} from '@angular/private/testing';
 
 import {InternalNgModuleRef, NgModuleFactory} from '../../src/linker/ng_module_factory';
 import {clearModulesForTest} from '../../src/linker/ng_module_factory_loader';
-import {stringify} from '../../src/util';
+import {stringify} from '../../src/util/stringify';
 
 class Engine {}
 
diff --git a/packages/core/test/linker/query_integration_spec.ts b/packages/core/test/linker/query_integration_spec.ts
index e3d554d4a5..96919cef56 100644
--- a/packages/core/test/linker/query_integration_spec.ts
+++ b/packages/core/test/linker/query_integration_spec.ts
@@ -12,7 +12,7 @@ import {expect} from '@angular/platform-browser/testing/src/matchers';
 import {fixmeIvy, ivyEnabled, modifiedInIvy} from '@angular/private/testing';
 import {Subject} from 'rxjs';
 
-import {stringify} from '../../src/util';
+import {stringify} from '../../src/util/stringify';
 
 describe('Query API', () => {
 
diff --git a/packages/core/test/linker/system_ng_module_factory_loader_spec.ts b/packages/core/test/linker/system_ng_module_factory_loader_spec.ts
index fbbaa0f591..ceb031c251 100644
--- a/packages/core/test/linker/system_ng_module_factory_loader_spec.ts
+++ b/packages/core/test/linker/system_ng_module_factory_loader_spec.ts
@@ -7,7 +7,7 @@
  */
 
 import {Compiler, SystemJsNgModuleLoader} from '@angular/core';
-import {global} from '@angular/core/src/util';
+import {global} from '@angular/core/src/util/global';
 import {async} from '@angular/core/testing';
 import {afterEach, beforeEach, describe, expect, it} from '@angular/core/testing/src/testing_internal';
 
diff --git a/packages/core/test/reflection/reflector_spec.ts b/packages/core/test/reflection/reflector_spec.ts
index a8c2080e39..71f45b55eb 100644
--- a/packages/core/test/reflection/reflector_spec.ts
+++ b/packages/core/test/reflection/reflector_spec.ts
@@ -8,8 +8,8 @@
 
 import {Reflector} from '@angular/core/src/reflection/reflection';
 import {DELEGATE_CTOR, INHERITED_CLASS, INHERITED_CLASS_WITH_CTOR, ReflectionCapabilities} from '@angular/core/src/reflection/reflection_capabilities';
-import {global} from '@angular/core/src/util';
 import {makeDecorator, makeParamDecorator, makePropDecorator} from '@angular/core/src/util/decorators';
+import {global} from '@angular/core/src/util/global';
 
 interface ClassDecoratorFactory {
   (data: ClassDecorator): any;
diff --git a/packages/core/test/render3/BUILD.bazel b/packages/core/test/render3/BUILD.bazel
index 87237e1bb8..f57c278e75 100644
--- a/packages/core/test/render3/BUILD.bazel
+++ b/packages/core/test/render3/BUILD.bazel
@@ -22,6 +22,9 @@ ts_library(
         "//packages/common",
         "//packages/compiler",
         "//packages/core",
+        "//packages/core/src/di/interface",
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
         "//packages/core/testing",
         "//packages/platform-browser",
         "//packages/platform-browser/animations",
diff --git a/packages/core/test/render3/global_utils_spec.ts b/packages/core/test/render3/global_utils_spec.ts
index 5e8d5ebf69..fe0c35994e 100644
--- a/packages/core/test/render3/global_utils_spec.ts
+++ b/packages/core/test/render3/global_utils_spec.ts
@@ -10,7 +10,7 @@ import {ɵmarkDirty as markDirty} from '@angular/core';
 import {getComponent, getContext, getDirectives, getHostElement, getInjector, getListeners, getRootComponents, getViewComponent} from '../../src/render3/discovery_utils';
 import {GLOBAL_PUBLISH_EXPANDO_KEY, GlobalDevModeContainer, publishDefaultGlobalUtils, publishGlobalUtil} from '../../src/render3/global_utils';
 import {getPlayers} from '../../src/render3/players';
-import {global} from '../../src/util';
+import {global} from '../../src/util/global';
 
 describe('global utils', () => {
   describe('publishGlobalUtil', () => {
diff --git a/packages/core/test/render3/ivy/BUILD.bazel b/packages/core/test/render3/ivy/BUILD.bazel
index 9f89287a01..efd2b58d8e 100644
--- a/packages/core/test/render3/ivy/BUILD.bazel
+++ b/packages/core/test/render3/ivy/BUILD.bazel
@@ -9,6 +9,7 @@ ts_library(
     deps = [
         "//packages:types",
         "//packages/core",
+        "//packages/core/src/di/interface",
     ],
 )
 
diff --git a/packages/core/test/render3/ivy/jit_spec.ts b/packages/core/test/render3/ivy/jit_spec.ts
index fe6f0fcff6..5978a05fab 100644
--- a/packages/core/test/render3/ivy/jit_spec.ts
+++ b/packages/core/test/render3/ivy/jit_spec.ts
@@ -8,9 +8,9 @@
 import 'reflect-metadata';
 
 import {ElementRef, QueryList} from '@angular/core';
-import {InjectorDef, defineInjectable} from '@angular/core/src/di/defs';
 import {Injectable} from '@angular/core/src/di/injectable';
 import {inject, setCurrentInjector} from '@angular/core/src/di/injector_compatibility';
+import {InjectorDef, defineInjectable} from '@angular/core/src/di/interface/defs';
 import {ivyEnabled} from '@angular/core/src/ivy_switch';
 import {ContentChild, ContentChildren, ViewChild, ViewChildren} from '@angular/core/src/metadata/di';
 import {Component, Directive, HostBinding, HostListener, Input, Output, Pipe} from '@angular/core/src/metadata/directives';
diff --git a/packages/core/test/render3/metadata_spec.ts b/packages/core/test/render3/metadata_spec.ts
index 26494a6e37..7a124d9ee1 100644
--- a/packages/core/test/render3/metadata_spec.ts
+++ b/packages/core/test/render3/metadata_spec.ts
@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Type} from '../../src/interface/type';
 import {setClassMetadata} from '../../src/render3/metadata';
-import {Type} from '../../src/type';
 
 interface Decorator {
   type: any;
diff --git a/packages/core/test/render3/perfCounter_spec.ts b/packages/core/test/render3/perfCounter_spec.ts
index b98b54ff3b..48f42784d0 100644
--- a/packages/core/test/render3/perfCounter_spec.ts
+++ b/packages/core/test/render3/perfCounter_spec.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ngDevModeResetPerfCounters} from '../../src/render3/ng_dev_mode';
+import {ngDevModeResetPerfCounters} from '../../src/util/ng_dev_mode';
 
 beforeEach(ngDevModeResetPerfCounters);
 beforeEach(() => {
diff --git a/packages/core/test/render3/render_util.ts b/packages/core/test/render3/render_util.ts
index 64304962c3..ecc3a52c80 100644
--- a/packages/core/test/render3/render_util.ts
+++ b/packages/core/test/render3/render_util.ts
@@ -7,7 +7,7 @@
  */
 
 import {ChangeDetectorRef} from '@angular/core/src/change_detection/change_detector_ref';
-import {Provider} from '@angular/core/src/di/provider';
+import {Provider} from '@angular/core/src/di/interface/provider';
 import {ElementRef} from '@angular/core/src/linker/element_ref';
 import {TemplateRef} from '@angular/core/src/linker/template_ref';
 import {ViewContainerRef} from '@angular/core/src/linker/view_container_ref';
@@ -17,6 +17,7 @@ import {stringifyElement} from '@angular/platform-browser/testing/src/browser_ut
 
 import {SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ as R3_CHANGE_DETECTOR_REF_FACTORY} from '../../src/change_detection/change_detector_ref';
 import {Injector, SWITCH_INJECTOR_FACTORY__POST_R3__ as R3_INJECTOR_FACTORY} from '../../src/di/injector';
+import {Type} from '../../src/interface/type';
 import {SWITCH_ELEMENT_REF_FACTORY__POST_R3__ as R3_ELEMENT_REF_FACTORY} from '../../src/linker/element_ref';
 import {SWITCH_TEMPLATE_REF_FACTORY__POST_R3__ as R3_TEMPLATE_REF_FACTORY} from '../../src/linker/template_ref';
 import {SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ as R3_VIEW_CONTAINER_REF_FACTORY} from '../../src/linker/view_container_ref';
@@ -34,7 +35,6 @@ import {HEADER_OFFSET, LView} from '../../src/render3/interfaces/view';
 import {destroyLView} from '../../src/render3/node_manipulation';
 import {getRootView} from '../../src/render3/util';
 import {Sanitizer} from '../../src/sanitization/security';
-import {Type} from '../../src/type';
 
 import {getRendererFactory2} from './imported_renderer2';
 
diff --git a/packages/core/test/testability/testability_spec.ts b/packages/core/test/testability/testability_spec.ts
index 6acd7884f3..7eb7a09303 100644
--- a/packages/core/test/testability/testability_spec.ts
+++ b/packages/core/test/testability/testability_spec.ts
@@ -13,7 +13,7 @@ import {NgZone} from '@angular/core/src/zone/ng_zone';
 import {async, fakeAsync, flush, tick} from '@angular/core/testing';
 import {SpyObject, beforeEach, describe, expect, it} from '@angular/core/testing/src/testing_internal';
 
-import {scheduleMicroTask} from '../../src/util';
+import {scheduleMicroTask} from '../../src/util/microtask';
 
 // Schedules a microtasks (using a resolved promise .then())
 function microTask(fn: Function): void {
diff --git a/packages/core/test/util_spec.ts b/packages/core/test/util_spec.ts
index cd11cbd9ed..2c31deb7f1 100644
--- a/packages/core/test/util_spec.ts
+++ b/packages/core/test/util_spec.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {stringify} from '../src/util';
+import {stringify} from '../src/util/stringify';
 
 {
   describe('stringify', () => {
diff --git a/packages/core/test/view/BUILD.bazel b/packages/core/test/view/BUILD.bazel
index 31f50eb1cf..e4b7fb7200 100644
--- a/packages/core/test/view/BUILD.bazel
+++ b/packages/core/test/view/BUILD.bazel
@@ -10,6 +10,9 @@ ts_library(
     ),
     deps = [
         "//packages/core",
+        "//packages/core/src/di/interface",
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
         "//packages/core/testing",
         "//packages/platform-browser",
         "//packages/private/testing",
diff --git a/packages/core/test/view/ng_module_spec.ts b/packages/core/test/view/ng_module_spec.ts
index 53f8a464f7..6b3cbc7687 100644
--- a/packages/core/test/view/ng_module_spec.ts
+++ b/packages/core/test/view/ng_module_spec.ts
@@ -7,14 +7,14 @@
  */
 
 import {NgModuleRef} from '@angular/core';
-import {InjectableDef, defineInjectable} from '@angular/core/src/di/defs';
 import {INJECTOR, Injector} from '@angular/core/src/di/injector';
 import {InjectFlags, inject} from '@angular/core/src/di/injector_compatibility';
-import {makePropDecorator} from '@angular/core/src/util/decorators';
+import {InjectableDef, defineInjectable} from '@angular/core/src/di/interface/defs';
 import {NgModuleDefinition, NgModuleProviderDef, NodeFlags} from '@angular/core/src/view';
-import {moduleDef, moduleProvideDef, resolveNgModuleDep} from '@angular/core/src/view/ng_module';
+import {moduleDef} from '@angular/core/src/view/ng_module';
 import {createNgModuleRef} from '@angular/core/src/view/refs';
 import {tokenKey} from '@angular/core/src/view/util';
+
 import {APP_ROOT} from '../../src/di/scope';
 
 class Foo {}
diff --git a/packages/core/test/zone/ng_zone_spec.ts b/packages/core/test/zone/ng_zone_spec.ts
index 10307a5bbd..5ed7c61ea9 100644
--- a/packages/core/test/zone/ng_zone_spec.ts
+++ b/packages/core/test/zone/ng_zone_spec.ts
@@ -10,7 +10,7 @@ import {EventEmitter, NgZone} from '@angular/core';
 import {async, fakeAsync, flushMicrotasks} from '@angular/core/testing';
 import {AsyncTestCompleter, Log, beforeEach, describe, expect, inject, it, xit} from '@angular/core/testing/src/testing_internal';
 import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';
-import {scheduleMicroTask} from '../../src/util';
+import {scheduleMicroTask} from '../../src/util/microtask';
 import {NoopNgZone} from '../../src/zone/ng_zone';
 
 const needsLongerTimers = browserDetection.isSlow || browserDetection.isEdge;
diff --git a/packages/core/testing/src/testing_internal.ts b/packages/core/testing/src/testing_internal.ts
index fdfb9b0f9b..1620e2d718 100644
--- a/packages/core/testing/src/testing_internal.ts
+++ b/packages/core/testing/src/testing_internal.ts
@@ -7,7 +7,7 @@
  */
 
 import {ɵisPromise as isPromise} from '@angular/core';
-import {global} from '@angular/core/src/util';
+import {global} from '@angular/core/src/util/global';
 
 import {AsyncTestCompleter} from './async_test_completer';
 import {getTestBed, inject} from './test_bed';
diff --git a/tools/public_api_guard/BUILD.bazel b/tools/public_api_guard/BUILD.bazel
index 517993efa5..918bae387c 100644
--- a/tools/public_api_guard/BUILD.bazel
+++ b/tools/public_api_guard/BUILD.bazel
@@ -1,8 +1,31 @@
 load("//tools/ts-api-guardian:index.bzl", "ts_api_guardian_test")
 load(":public_api_guard.bzl", "generate_targets")
 
-generate_targets(glob(["*/**/*.d.ts"]))
+generate_targets(glob(
+    ["*/**/*.d.ts"],
+    # exclude the following target because we have an explicit target for it bellow, see :core_api
+    exclude = ["core/core.d.ts"],
+))
 
+# Explicit target because core is broken down into sub-packages.
+# The ts_api_guardian rule does not know how to collect the .d.ts files from the sub-packages so we have to list it here explicitly.
+# see: https://github.com/angular/angular/issues/28057
+ts_api_guardian_test(
+    name = "core_api",
+    actual = "angular/packages/core/core.d.ts",
+    data = ["//tools/public_api_guard:core/core.d.ts"] + [
+        "//packages/core",
+        "//packages/core/src/di/interface",
+        "//packages/core/src/interface",
+        "//packages/core/src/util",
+    ],
+    golden = "angular/tools/public_api_guard/core/core.d.ts",
+    tags = [
+        "fixme-ivy-aot",  # ivy no longer emits generated index file
+    ],
+)
+
+# explicit target because the d.ts file is nested in the core and not part of typical public d.ts api
 ts_api_guardian_test(
     name = "ng_global_utils_api",
     actual = "angular/packages/core/src/render3/global_utils_api.d.ts",