I have react next and node js project and I want to deploy that project at heroku. That is the structure of my project:-

and my package.json file is if I add "Start": "next start" only the frontend works and if I changed it "Start": "tsc -p server/tsconfig.json -watch && node server.js" it's gave me the error.

error is :-

CodePudding user response：

After Heroku installs the dependencies and devDependencies listed in package.json, all devDependencies get removed before the npm start command is run. So if you installed typescript under devDependencies and your project needs it at runtime, it won't be found. To stop it from being pruned, move typescript over to dependencies instead.

Another option would be to skip the pruning process altogether by setting the following config vars:

$ heroku config:set NPM_CONFIG_PRODUCTION=false YARN_PRODUCTION=false

Or set the NODE_ENV environment variable to anything other than production (Heroku's default).