# Types errors
Cannot read properties of undefined (reading '__untypedClient') on trpc.Provider
🙋♂️ help wanted👻 invalid🔎 needs more investigation/info⏮ needs reproduction🐛 bug: unconfirmed
RFC: Add `"examples"` to OpenAPI schema
enhancementhelp wanted
bug: TRPC's inferred mutation input type is incorrect when used with zod4's preprocess
👻 invalid🐛 bug: unconfirmed⏳ close if no activity
`inferProcedureInput` broken in published package
🐛 bug🧙🏻 typescript wizardry