My experience was very similar: I built an application using a GraphQL schema file that powered AppSync templated VTL/DynamoDB tables, as well as automatically generating GraphQL operations/types. When I cleaned up the application's template for reuse, I erroneously decided to try out Yarn 3/Lerna/PnP, and then lost an embarrassingly long time to make it work.

Each [1] tool [2] seemed [3] to break differently, and needed some form of manual massaging to make it work. That manual massaging meant learning a new configuration file syntax, multiple times.

When it worked, it felt magical. Weaving together an entire web app, powered by a small bit of GraphQL schema [4] means building at a high level of abstraction (hence can be very productive). The only issue is the muddy forest of the NPM ecosystem you're surrounded by: any step towards upgrading your external dependencies seems to cost far more time than promised.

[1] Yarn3/PnP seems to assume all packages define their dependencies correctly. Unfortunately, this isn't true in the real world. I spent hours massaging dependencies in https://github.com/ThomasRooney/reamplify/blob/master/.yarnr...

[2] Getting TypeScript to work cleanly both in an IDE (IntelliJ) and when imported across backend/frontend packages was really cumbersome: I ended up just emitting .gitignored JS files next to their associated TS.

[3] Whispering into the IDE to make it understand GraphQL required learning the .graphqlconfig syntax, and fine-tuning it.

[4] https://github.com/ThomasRooney/reamplify/blob/master/packag...