Node.js auto build

Drops the npm run build step from this buildpack, because build is now automatically run by Heroku's Node.js buildpack, which is an integral part of the parent create-react-app-buildpack.

👓 See more details in the main buildpack's pull request.

Default Routing

Configure the web-server to route all not-found requests to the client-side app index.html.

Split Bundles

Process all bundle files for compatibility with create-react-app version 2's split bundles.

Dyno Metadata

Support for using dyno metadata during npm run build.

Custom bundle UX

Improve user-experience when there's a problem with the custom bundle path.

Custom bundle

Support for runtime environment variables in a bundle generated at a custom path. Usage:

heroku config:set JS_RUNTIME_TARGET_BUNDLE=/app/my/custom/path/js/main.*.js

npm Private Modules

Support npm Private Modules during build via NPM_TOKEN env var.

https://docs.npmjs.com/private-modules/ci-server-config

Preserve Source Maps

Runtime environment variables no longer skew source maps in production. Supports up to 4KB of env var JSON; excess of 4KB will offset the source map.

If already using runtime env vars, upgrade to @mars/heroku-js-runtime-env v3.0.0 for this fix.

Runtime Env

Support for runtime environment variables.

Nodeworthy

Support NODE_PATH (and other NODE_* env variables) during build.