don't be too strict

src/decorators/register.ts

@@ -142,25 +142,29 @@ function applySchemaForClass<T>(
   return instance;
 }
 
+export function SchemaClass<T>(originalClass: ClassType<T>) {
+  const schema = schemaFromClass(originalClass);
+  const newClass = (function (...args: any[]): T {
+    const instance = new originalClass(...args);
+    const originalObject = args[0];
+    return applySchemaForClass(originalClass, instance, originalObject);
+  } as unknown) as ClassType<T> & Schema<T>;
+  Object.defineProperty(newClass, 'name', {
+    value: originalClass.name,
+  });
+  Object.setPrototypeOf(newClass, originalClass.prototype);
+  for (const field of schemaFields) {
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
+    newClass[field] = schema[field];
+  }
+  return newClass;
+}
+
 export function RegisterSchema(options: SchemaClassOptions = {}) {
-  return function <T>(originalClass: ClassType<T>) {
+  return function <T>(originalClass: ClassType<T>): any {
     Metadata.set('SchemaClassOptions', options)(originalClass);
-    const schema = schemaFromClass(originalClass);
-    const newClass = (function (...args: any[]): any {
-      const instance = new originalClass(...args);
-      const originalObject = args[0];
-      return applySchemaForClass(originalClass, instance, originalObject);
-    } as unknown) as ClassType<T> & Schema<T>;
-    Object.defineProperty(newClass, 'name', {
-      value: originalClass.name,
-    });
-    Object.setPrototypeOf(newClass, originalClass.prototype);
-    for (const field of schemaFields) {
-      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-      // @ts-ignore
-      newClass[field] = schema[field];
-    }
-    return newClass;
+    return SchemaClass(originalClass);
   };
 }