Heroku does not find private NPM package - reactjs

Question

UPDATE: Seems the error is related to one of my private packages
I am using a private module for my react app, built with heroku-create-react-app.
this is my .npmrc inside the project root folder:
//registry.npmjs.org/:_authToken={NPM_TOKEN}
init.author.name=My.Name
scope=username
#username:registry=https://registry.npmjs.org/
and my package.json
"dependencies": {
"#myname/my-component": "^0.1.9",
...
}
"scripts": {
"build-css": "node-sass-chokidar ./src/ -o ./src/",
"watch-css": "npm run build-css && node-sass-chokidar src/ -o src/ --watch --recursive",
"start-js": "react-scripts start",
"start": "npm-run-all -p watch-css start-js",
"build-js": "react-scripts build",
"build": "npm-run-all build-css build-js",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
On heroku I set up the environment variable as
NPM_TOKEN and set the token as its value.
When pushing to heroku I get this error:
remote: -----> Building dependencies
remote: Installing node modules (package.json + package-lock)
remote: npm ERR! code E404
remote: npm ERR! 404 Not Found: #myname/my-component#https://registry.npmjs.org/#my-name/my-component/-/my-component-0.1.9.tgz
remote:

Answer 1

I don't see the GitHub repository named heroku-create-react-app, but if it's bootstrapped using create-react-app, the variable name needs to start with "REACT_APP_" for it to be available under the variable process.env. This post has more information: http://uidevdaily.com/2018/how-to-set-environment-specific-variables-in-a-react-app.