feat(compiler-cli): export tooling definitions (#29929)

PR Close #29929

packages/compiler-cli/src/tooling.ts

@@ -0,0 +1,22 @@
+/**
+ * @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
+ */
+
+/**
+ * @module
+ * @description
+ * Tooling support helpers.
+ */
+
+/**
+ * Known values for global variables in `@angular/core` that Terser should set using
+ * https://github.com/terser-js/terser#conditional-compilation
+ */
+export const GLOBAL_DEFS_FOR_TERSER = {
+  ngDevMode: false,
+  ngI18nClosureMode: false,
+};