Fixing ERR_INVALID_THIS error on Vercel using PNPM

I was in the beginning stages of creating my application using T3 and Clerk when I ran into a peculiar error when attempting to deploy in Vercel.

I was trying to deploy my application in vercel when I was running into this error

To fix this, I needed to run corepack up which will put the current version of the packageManager that you’re using into your package.json file.

Then in Vercel, be sure to add the environment variable ENABLE_EXPERIMENTAL_COREPACK and set it’s value to 1. This will enable corepack support.

After making this change I was successfully able to get my vercel deployment to work.

I had lost about 3 hours of development time trying to get it to work, so I’m hoping that this small blog post helped you figure this out as well.