nvm-heroku-buildpack

This custom Heroku buildpack is designed specifically for building Node.js applications with different versions using NVM (Node Version Manager). Unlike traditional runtime buildpacks, this buildpack is tailored for the application build process, ensuring flexibility in managing Node.js versions during the build phase.

In your package.json add engines section and declare versions of Node.js and NPM.

{
  "engines": {
    "node": "20.10.x",
    "npm": "10.2.x"
  }
}

In the root of the project add nvm-projects.json and provide list of your Node.js applications

[
  {
    "name": "Frontend (Legacy)",
    "package_path": "./assets/legacy-app/package.json"
  },
  {
    "name": "Frontend",
    "package_path": "./assets/app/package.json"
  }
]

Optionally you can provide a list of NPM scripts to run. By default, it runs install and build scripts.

[
  {
    "name": "Frontend",
    "package_path": "./assets/app/package.json",
    "npm_scripts": ["build:lib", "build:app"]
  }
]

Add buildpack to your Heroku app

$ heroku buildpacks:add https://github.com/Floship/nvm-heroku-buildpack