Error deploying openai / openai-quickstart-node example from github to heroku

I am having issues deploying the quick start node app example on github to Heroku. I am getting the following error in the logs:

Installing dependencies
   Installing node modules
   npm ERR! notsup Unsupported platform for fsevents@2.3.2: wanted {"os":"darwin"} (current: {"os":"linux","arch":"x64"})
   npm ERR! notsup Valid OS:    darwin
   npm ERR! notsup Valid Arch:  undefined
   npm ERR! notsup Actual OS:   linux
   npm ERR! notsup Actual Arch: x64

There are some specified with darwin in the package-json-file but not sure what I would need to add here. Anyone else had the same issue? Any help would be greatly appreciated. Thanks!