(help)Deploy Nest.js Application to Vercel

#javascript #nestjs #vercel

Such a puzzle trip.
If you are also trapped in the issue that deploying Nest.js App to Vercel, you can just refer to this Video
I have searched and tried many other articles for a whole day, and all of them didn't help a little, and I also looked through Vercel's documents 2-3 times, I am still in the puzzle now.
Even if I successfully deployed it, I also don't know what this configuration means
is anyone know how can I get a deep understanding of how Vercel works?

why putting main.ts file here, does it mean that in the production, it directly executes the ts file instead of running the compiled main.js?
- if the answer is yes, it seems we don't need to run nest build in Vercel.
- if the answer is no, what Vercel did to main.ts then?