I got it working using this:
"postinstall": "npm run production", "heroku-prebuild": "npm install -f", "heroku-postbuild": "npm run production"
That rebuilt the assets multiple times, so I trimmed it down to just this and it seems to be all that is needed. At least, it is working for me now:
"heroku-postbuild": "npm run production"
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I got it working using this:
That rebuilt the assets multiple times, so I trimmed it down to just this and it seems to be all that is needed. At least, it is working for me now: