Hey there,
I couldn’t find the right place to discuss it, but to avoid having to do again and again a manual integration each time I want to use Forest with NestJS, i’ve created a nestjs-first module.
I’ll continue maintaining it for a while since I use it on big production projects.
It is available here GitHub - Segfaultd/nestjs-forest: NestJS module for the Forest Admin agent
Feel free to make any issue / PR / comment 
