build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/check-file-size.js

@@ -0,0 +1,28 @@
+/**
+ * @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 fs = require('fs');
+
+module.exports = function(config) {
+  let chkResult = true;
+  config.targets.forEach(target => {
+    if (target.checkTarget) {
+      try {
+        const stats = fs.statSync(target.path);
+        if (stats.size > target.limit) {
+          console.error(
+              `file ${target.path} size over limit, limit is ${target.limit}, actual is ${stats.size}`);
+          chkResult = false;
+        }
+      } catch (err) {
+        console.error(`failed to get filesize: ${target.path}`);
+        chkResult = false;
+      }
+    }
+  });
+  return chkResult;
+};