fixup! fix(core): update isDevMode to rely on ngDevMode

packages/core/src/util/is_dev_mode.ts

@@ -11,7 +11,9 @@ import {global} from './global';
 /**
  * Returns whether Angular is in development mode.
  *
- * By default, this is true, unless a user calls `enableProdMode` before calling this.
+ * By default, this is true, unless `enableProdMode` is invoked prior to calling this method or the
+ * application is built using the Angular CLI with the `optimization` option.
+ * @see {@link guicli/build ng build}
  *
  * @publicApi
  */
@@ -27,6 +29,10 @@ export function isDevMode(): boolean {
  * does not result in additional changes to any bindings (also known as
  * unidirectional data flow).
  *
+ * Using this method is discouraged as the Angular CLI will set production mode when using the
+ * `optimization` option.
+ * @see {@link guicli/build ng build}
+ *
  * @publicApi
  */
 export function enableProdMode(): void {