Production mode npm start:prod

[bobstarbird]

Following instructions like:

npm start:prod
or
NODE_ENV=production npm start:prod
results in errors
Usage: npm

Workaround:
npm run-script start:prod

package.json contains
"scripts": {
…
"start:prod": "cross-env-shell NODE_ENV=production GROVE_UI_BUILD_PATH=../ui/build npm run middleTier:prod",