refactor: Authentication service.

server/src/exceptions/ServiceErrors.ts

@@ -0,0 +1,15 @@
+import ServiceError from './ServiceError';
+
+
+export default class ServiceErrors {
+  errors: ServiceError[];
+
+  constructor(errors: ServiceError[]) {
+    this.errors = errors;
+  }
+
+  hasType(errorType: string) {
+    return this.errors
+      .filter((error: ServiceError) => error.errorType === errorType);
+  }
+}