In production: Please install pg package manually

[ValentynZup]

On localhost everything works fine, but on vercel deployment api returns message: "Please install pg package manually"

To reproduce:
"sequelize": "^6.19.2",
"sequelize-cockroachdb": "^6.0.5",

With or without pg package - same error in production mode

[ValentynZup]

I have installed and uninstalled pg package both globally and locally

[kernfeld-cockroach]

Looking at sequelize/sequelize#6907, one cause of this is having sequelize installed in a different location than pg. Did you try any of the fixes suggested on that issue?