mongoose-fill | Virtual async fileds for mongoose.js | DB Client library

Some introduction:

Our app uses Heroku as a server. So, after pushing code it runs npm start as in my package.json

My current version of nodeJS in a laptop: v8.16.2, npm: 6.4.1.

In package.json:

"engines": { "node": "10.16.3", "npm": "6.9.0" },

The problem:

Currently, it runs like this "start": "node build/index.js" . Last changes were about adding graphql files.

npm start show Error: ENOENT: no such file or directory, open '/app/build/apollo/nCourse/nCourse.graphql'

We don't run with node server/index.js because of using new ecma script features(not common js) like import and export

The question

I see two solutions in this problem

1. Make something which will create the file with graphql extension in build folder

2. Maybe update version of nodeJS if it can understand es import and export

Package.json