diff --git a/libs/core/src/lib/di/decorators/inject.ts b/libs/core/src/lib/di/decorators/inject.ts
index 1908474..2bf5884 100644
--- a/libs/core/src/lib/di/decorators/inject.ts
+++ b/libs/core/src/lib/di/decorators/inject.ts
@@ -9,6 +9,5 @@ export function Inject<T extends object>(token: Token<T>) {
       target,
       `index-${index}`
     );
-    return target;
   };
 }
diff --git a/libs/core/src/lib/di/decorators/injectable.ts b/libs/core/src/lib/di/decorators/injectable.ts
index 49dc6bd..351943c 100644
--- a/libs/core/src/lib/di/decorators/injectable.ts
+++ b/libs/core/src/lib/di/decorators/injectable.ts
@@ -4,6 +4,5 @@ export function Injectable<T extends object>() {
   return function (target: T) {
     // o target, neste caso, é a classe que está sendo decorada.
     Reflect.defineMetadata(INJECTABLE_METADATA_KEY, true, target);
-    return target;
   };
 }
diff --git a/libs/core/src/lib/di/injector.spec.ts b/libs/core/src/lib/di/injector.spec.ts
index ebc4b91..afc7fc8 100644
--- a/libs/core/src/lib/di/injector.spec.ts
+++ b/libs/core/src/lib/di/injector.spec.ts
@@ -15,7 +15,7 @@ const API_TOKEN = new InjectionToken<ApiConfig>('api.config');
 abstract class Repository {
   protected api: string;
 
-  constructor(config: ApiConfig) {
+  protected constructor(config: ApiConfig) {
     this.api = config.url;
   }
 
@@ -34,7 +34,7 @@ class DataRepository extends Repository {
 }
 
 abstract class Presenter {
-  constructor(public repository: Repository) {}
+  protected constructor(public repository: Repository) {}
 
   abstract getAll(): Promise<unknown[]>;
 }
@@ -64,7 +64,7 @@ describe('Injector', () => {
         provide: Presenter,
         useFactory: (repo: Repository) => new UiPresenter(repo),
         deps: [Repository],
-      }
+      },
     ]);
   });
 
@@ -73,7 +73,7 @@ describe('Injector', () => {
   });
 
   it('should return config object when asking api token', () => {
-    const config = injector.get<ApiConfig>(API_TOKEN);
+    const config = injector.get(API_TOKEN);
     expect(config).toStrictEqual({
       url: 'https://api.clean-architecture.design',
     });
diff --git a/libs/core/src/lib/di/injector.ts b/libs/core/src/lib/di/injector.ts
index 715e239..884263f 100644
--- a/libs/core/src/lib/di/injector.ts
+++ b/libs/core/src/lib/di/injector.ts
@@ -30,7 +30,7 @@ export class Injector {
     this.providers.set(provider.provide, provider);
   }
 
-  static create<T>(providers: Provider<T>[]) {
+  static create(providers: Provider[]) {
     if (!Injector.instance) {
       Injector.instance = new Injector(providers);
     }