diff --git a/lib/resources/messages.js b/lib/resources/messages.js
index b7eaaa1..5788d21 100644
--- a/lib/resources/messages.js
+++ b/lib/resources/messages.js
@@ -1,7 +1,6 @@
 import * as _ from "lodash";
 
 import {
-    PlivoGenericResponse,
     PlivoResource,
     PlivoResourceInterface
 } from '../base';
@@ -10,8 +9,6 @@ import {
     validate
 } from '../utils/common.js';
 
-import { type } from "os";
-
 const action = 'Message/';
 const idField = 'messageUuid';
 let actionKey = Symbol('api action');
diff --git a/types/base.d.ts b/types/base.d.ts
index 6609e79..ab17e9b 100644
--- a/types/base.d.ts
+++ b/types/base.d.ts
@@ -3,7 +3,7 @@ export class PlivoGenericResponse {
     id: string;
 }
 export class PlivoResource {
-    constructor(action: string, klass: any, idField: string, request: any);
+    constructor(action: string, Klass: Symbol, idField: string, request: any);
     update(params: object, id: string): Promise<any>;
     delete(params: object): Promise<any>;
     executeAction(task: string, method: string, params: {}, action: string): Promise<any>;
@@ -12,7 +12,7 @@ export class PlivoResource {
     getMetaResponse(url: any, method?: string, params?: {}): Promise<any>;
 }
 export class PlivoResourceInterface {
-    constructor(action: string, klass: any, idField: string, request: any);
+    constructor(action: string, Klass: Symbol, idField: string, request: any);
     get(id: string, params?: {}): Promise<any>;
     list(params: object): Promise<any>;
     create(params: object): Promise<any>;