feat(tsc-wrapped): Support of vinyl like config file was added (#13987)

This feature was implemented in order to provide easier way of use in gulp

tools/@angular/tsc-wrapped/src/vinyl_file.ts

@@ -0,0 +1,19 @@
+/**
+ * @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
+ */
+export interface VinylFile extends Object {
+  // Absolute path to the virtual file
+  path: string;
+
+  // Content of the virtual file
+  contents: Buffer;
+}
+;
+
+export function isVinylFile(obj: any): obj is VinylFile {
+  return (typeof obj === 'object') && ('path' in obj) && ('contents' in obj);
+};