fix: ClientImplementation add scope fn

es/Client.js

 import _typeof from "@babel/runtime/helpers/esm/typeof";
 import ClientImplementation from './ClientImplementation';
 import { ERROR } from './consts';
+import { validate } from './utils';
 /* eslint-disable */
 
 var Client = function Client(host, port, path, clientId) {

lib/Client.js

@@ -13,6 +13,8 @@ var _ClientImplementation = _interopRequireDefault(require("./ClientImplementati
 
 var _consts = require("./consts");
 
+var _utils = require("./utils");
+
 /* eslint-disable */
 var Client = function Client(host, port, path, clientId) {
   var uri;
@@ -226,7 +228,7 @@ var Client = function Client(host, port, path, clientId) {
 
   this.connect = function (connectOptions) {
     connectOptions = connectOptions || {};
-    validate(connectOptions, {
+    (0, _utils.validate)(connectOptions, {
       timeout: 'number',
       userName: 'string',
       password: 'string',
@@ -348,7 +350,7 @@ var Client = function Client(host, port, path, clientId) {
   this.subscribe = function (filter, subscribeOptions) {
     if (typeof filter !== 'string' && filter.constructor !== Array) throw new Error('Invalid argument:' + filter);
     subscribeOptions = subscribeOptions || {};
-    validate(subscribeOptions, {
+    (0, _utils.validate)(subscribeOptions, {
       qos: 'number',
       invocationContext: 'object',
       onSuccess: 'function',
@@ -392,7 +394,7 @@ var Client = function Client(host, port, path, clientId) {
   this.unsubscribe = function (filter, unsubscribeOptions) {
     if (typeof filter !== 'string' && filter.constructor !== Array) throw new Error('Invalid argument:' + filter);
     unsubscribeOptions = unsubscribeOptions || {};
-    validate(unsubscribeOptions, {
+    (0, _utils.validate)(unsubscribeOptions, {
       invocationContext: 'object',
       onSuccess: 'function',
       onFailure: 'function',

src/ClientImplementation.js

@@ -28,6 +28,11 @@ const Timeout = function (client, timeoutSeconds, action, args) {
     clearTimeout(this.timeout);
   };
 };
+const scope = function (f, scope) {
+  return function () {
+    return f.apply(scope, arguments);
+  };
+};
 /* eslint-disable */
 const ClientImplementation = function (
   uri,