refactor(facade): move isPromise to core private (#10573)

modules/@angular/core/src/application_init.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isPromise} from '../src/facade/lang';
+import {isPromise} from '../src/util/lang';
 
 import {Inject, Injectable, OpaqueToken, Optional} from './di';
 

modules/@angular/core/src/application_ref.ts

@@ -9,7 +9,8 @@
 import {ErrorHandler} from '../src/error_handler';
 import {ListWrapper} from '../src/facade/collection';
 import {unimplemented} from '../src/facade/errors';
-import {isBlank, isPresent, isPromise, stringify} from '../src/facade/lang';
+import {isBlank, isPresent, stringify} from '../src/facade/lang';
+import {isPromise} from '../src/util/lang';
 
 import {ApplicationInitStatus} from './application_init';
 import {APP_BOOTSTRAP_LISTENER, PLATFORM_INITIALIZER} from './application_tokens';

modules/@angular/core/src/core_private_export.ts

@@ -39,6 +39,7 @@ import * as reflector_reader from './reflection/reflector_reader';
 import * as reflection_types from './reflection/types';
 import * as api from './render/api';
 import * as decorators from './util/decorators';
+import {isPromise} from './util/lang';
 
 export var __core_private__: {
   isDefaultChangeDetectionStrategy: typeof constants.isDefaultChangeDetectionStrategy,
@@ -118,9 +119,11 @@ export var __core_private__: {
   ANY_STATE: typeof ANY_STATE_,
   DEFAULT_STATE: typeof DEFAULT_STATE_,
   EMPTY_STATE: typeof EMPTY_STATE_,
-  FILL_STYLE_FLAG: typeof FILL_STYLE_FLAG_, _ComponentStillLoadingError?: ComponentStillLoadingError
-  ComponentStillLoadingError: typeof ComponentStillLoadingError
-  } = {
+  FILL_STYLE_FLAG: typeof FILL_STYLE_FLAG_,
+  _ComponentStillLoadingError?: ComponentStillLoadingError,
+  ComponentStillLoadingError: typeof ComponentStillLoadingError,
+  isPromise: typeof isPromise
+} = {
   isDefaultChangeDetectionStrategy: constants.isDefaultChangeDetectionStrategy,
   ChangeDetectorStatus: constants.ChangeDetectorStatus,
   CHANGE_DETECTION_STRATEGY_VALUES: constants.CHANGE_DETECTION_STRATEGY_VALUES,
@@ -185,5 +188,6 @@ export var __core_private__: {
   DEFAULT_STATE: DEFAULT_STATE_,
   EMPTY_STATE: EMPTY_STATE_,
   FILL_STYLE_FLAG: FILL_STYLE_FLAG_,
-  ComponentStillLoadingError: ComponentStillLoadingError
+  ComponentStillLoadingError: ComponentStillLoadingError,
+  isPromise: isPromise
 };

modules/@angular/core/src/util/lang.ts

@@ -0,0 +1,13 @@
+/**
+ * @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 isPromise(obj: any): obj is Promise<any> {
+  // allow any Promise/A+ compliant thenable.
+  // It's up to the caller to ensure that obj.then conforms to the spec
+  return !!obj && typeof obj.then === 'function';
+}