error handling & formatting

[KATT]

• closes onError handler #139
• closes formatError()-handler #144

see

• https://www-git-feature-err.tmp.trpc.io/docs/error-handling
• https://www-git-feature-err.tmp.trpc.io/docs/error-formatting

---

changes:

• add onError-fn
• add formatError-fn
• now passing procedure type to middlewares
• managed to get rid of TMiddlewares-generic
• update error handling
  • all server errors are TRPCError-instances
  • client errors get a .shape-object that is used is reflected from the formatError-fn

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

chat – ./examples/next-ssg-chat

🔍 Inspect: https://vercel.com/trpc/chat/4mX9d37YUHwRhnuLD2E1bGQCEJjh
✅ Preview: https://chat-git-feature-err.tmp.trpc.io

hello-world – ./examples/next-hello-world

🔍 Inspect: https://vercel.com/trpc/hello-world/92tKYLwM4PWvp2DNMG9DYZUYAKti
✅ Preview: https://hello-world-git-feature-err.tmp.trpc.io

www – ./www

🔍 Inspect: https://vercel.com/trpc/www/6URq7TSnDbot9s7rZTz321JXGzjy
✅ Preview: https://www-git-feature-err.tmp.trpc.io

todomvc – ./examples/next-prisma-todomvc

🔍 Inspect: https://vercel.com/trpc/todomvc/Ds9sFL3HHCsZQPnpLKCWigiZPe6W
✅ Preview: https://todomvc-git-feature-err.tmp.trpc.io

next-api-caching – ./examples/next-api-caching

🔍 Inspect: https://vercel.com/trpc/next-api-caching/ENDASDKmsGa72ZPQ2kdWKKk1mdMU
✅ Preview: https://next-api-caching-git-feature-err.tmp.trpc.io

[cyrus-za]

this is awesome work! Thanks for putting the time in for getting it out. Check the uncommented code. Other than that it looks amazinf