Heroku "content not from webpack is served from /app/public" despite using all default create-react-app config
So, I got a Solution, Heroku uses nodejs buildpack as default. You'll need to add that of CRA(Create react App).
First, check the build pack you're using heroku buildpacks -a <appname>
then change to CRA buildpack heroku buildpacks:set mars/create-react-app -a <appname>
Then redeploy.
You can read this article for more configuration
Heroku uses default build pack as heroku/nodejs.Need too changes your buildpack configuration in your heroku app settings.You can use add below git url as build pack for react app
You can add object "engines" inside package.json (version node & npm using build your app)
"engines": { "node": "10.15.3", "npm": "6.14.5" }***check version : node -v & npm -v
P/s: It's working with me.