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src/polyfills.ts

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+/**
+ * This file includes polyfills needed by Angular and is loaded before the app.
+ * You can add your own extra polyfills to this file.
+ */
+
+/***************************************************************************************************
+ * Zone JS is required by Angular itself.
+ */
+import 'zone.js';  // Included with Angular CLI.
+
+// If you need other polyfills, add them here.