added hal serializer

src/app/core/core.module.ts

@@ -0,0 +1,42 @@
+import { NgModule, Optional, SkipSelf, ModuleWithProviders } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { SharedModule } from "../shared/shared.module";
+import { isNotEmpty } from "../shared/empty.util";
+
+const IMPORTS = [
+  CommonModule,
+];
+
+const DECLARATIONS = [
+
+];
+
+const EXPORTS = [
+];
+
+const PROVIDERS = [
+];
+
+@NgModule({
+  imports: [ ...IMPORTS ],
+  declarations: [...DECLARATIONS],
+  exports: [...EXPORTS],
+  providers: [...PROVIDERS]
+})
+export class CoreModule {
+  constructor (@Optional() @SkipSelf() parentModule: CoreModule) {
+    if (isNotEmpty(parentModule)) {
+      throw new Error(
+        'CoreModule is already loaded. Import it in the AppModule only');
+    }
+  }
+
+  static forRoot(): ModuleWithProviders {
+    return {
+      ngModule: SharedModule,
+      providers: [
+        ...PROVIDERS
+      ]
+    };
+  }
+}