fix(errors): [1/2] Rename Exception to Error; remove from public API

modules/@angular/facade/src/errors.ts

@@ -0,0 +1,64 @@
+/**
+ * @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 {BaseWrappedException} from './base_wrapped_exception';
+import {ExceptionHandler} from './exception_handler';
+
+export {ExceptionHandler} from './exception_handler';
+
+/**
+ * @stable
+ */
+export class BaseException extends Error {
+  public stack: any;
+  constructor(public message: string = '--') {
+    super(message);
+    this.stack = (<any>new Error(message)).stack;
+  }
+
+  toString(): string { return this.message; }
+}
+
+/**
+ * Wraps an exception and provides additional context or information.
+ * @stable
+ */
+export class WrappedException extends BaseWrappedException {
+  private _wrapperStack: any;
+
+  constructor(
+      private _wrapperMessage: string, private _originalException: any /** TODO #9100 */,
+      private _originalStack?: any /** TODO #9100 */, private _context?: any /** TODO #9100 */) {
+    super(_wrapperMessage);
+    this._wrapperStack = (<any>new Error(_wrapperMessage)).stack;
+  }
+
+  get wrapperMessage(): string { return this._wrapperMessage; }
+
+  get wrapperStack(): any { return this._wrapperStack; }
+
+
+  get originalException(): any { return this._originalException; }
+
+  get originalStack(): any { return this._originalStack; }
+
+
+  get context(): any { return this._context; }
+
+  get message(): string { return ExceptionHandler.exceptionToString(this); }
+
+  toString(): string { return this.message; }
+}
+
+export function makeTypeError(message?: string): Error {
+  return new TypeError(message);
+}
+
+export function unimplemented(): any {
+  throw new BaseException('unimplemented');
+}