Issue in sample: Client not found

If I execute the sample code given in the Github readme. The node application throws error that client is not defined.

The code I executed is

const config = {
apiVersion: 'v1',
clusters: [],
contexts: [],
'current-context': '',
kind: 'Config',
users: []
}
const { KubeConfig } = require('kubernetes-client')
const kubeconfig = new KubeConfig()
kubeconfig.loadFromString(JSON.stringify(config))

const Request = require('kubernetes-client/backends/request')
const backend = new Request({ kubeconfig })
const client = new Client({ backend, version: '1.13' })

The error I got is

(node:11776) UnhandledPromiseRejectionWarning: ReferenceError: Client is not defined
at getNamespaces (F:\Docker\PARSEC-TOOL\TaskRunner.js:84:18)
at Object. (F:\Docker\PARSEC-TOOL\app.js:28:1)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
(node:11776) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:11776) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Can someone help me out