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To deploy a javascript SPA thing, add two webpacks: nodejs and heroku-buildpack-static (the order might be relevant):

heroku buildpacks:clear
heroku buildpacks:add heroku/nodejs
heroku buildpacks:add https://github.com/heroku/heroku-buildpack-static

Add a postinstall script to package.json:

"postinstall": "yarn run build"

Add a static.json file, used to trigger the static-buildpack and feed the nginx configuration. Check the repo for details on its syntax. Sample file:

{
  "root": "dist/",
  "routes": {
    "/**": "index.html"
  }
}

If you're using yarn, you might be required to disable heroku's node modules cache, to avoid node-sass vendor issues:

heroku config:set NODE_MODULES_CACHE=false

Heroku runs npm/yarn in production mode, so it won't install devDependencies. Make sure all your build dependencies requirements are in the dependencies section.

heroku config:set NPM_CONFIG_PRODUCTION=false