Cannot provide node options and run start

When I run
API_URL=https://api.digitransit.fi GEOCODING_BASE_URL=https://api.digitransit.fi/geocoding/v1 OTP_URL=https://api.digitransit.fi/routing/v1/routers/finland/ yarn run start

I get module error a

As you can see I just created a simple stats.json file but it does not work

In app/server.js when the environment is not dev it looks for manifest and stats json file

if (process.env.NODE_ENV !== 'development') {
// eslint-disable-next-line global-require, import/no-unresolved
assets = require('../manifest.json');
// eslint-disable-next-line global-require, import/no-unresolved
mainAssets = require('../stats.json').entrypoints.main.assets.filter(
asset => !asset.endsWith('.map'),
);

How should we provide it?
Thanks

Start in app/server.js, especially the non-development branch that requires manifest.json and stats.json, and reproduce the reported yarn run start command with the shown environment variables. Determine how these files are expected to be supplied or generated, then make the startup path work or clearly report the required setup without the module error.