Google  Node JS chat issue

/var/www/html/hangouts-chat-samples/node/accounts-bot/index.js
While use **npm run lint**  we are getting below error.

`> hangouts-chat-node-samples@1.0.0 lint
> eslint **/*.js


/var/www/html/hangouts-chat-samples/node/accounts-bot/index.js
  13:40  error  Parsing error: Unexpected token =>

✖ 1 problem (1 error, 0 warnings)
`