[BUG] Error during the zod schema generation

[pablo-k-neruda]

Describe the bug
Getting the following error - Type 'string' is not assignable to type 'undefined'. when generating the zod schema from prisma

Screenshots

Package versions (please complete the following information):

• zod: 3.22.4
• prisma: 5.7.1
• zod-prisma-types: 3.1.6

Additional context
I am using next.js and Supabase with prisma and trying to add Zod in the project. The prisma schema usage works fine in app. Here is the prisma schema. I am using "prisma generate --no-engine".

generator client {
provider = "prisma-client-js"
}

generator zod {
provider = "zod-prisma-types"
}

generator erd {
provider = "prisma-erd-generator"
disabled = true
}

datasource db {
provider = "postgresql"
url = env("DATABASE_URL")
directUrl = env("DIRECT_URL")
}

model User {
id String @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
name String
created_at DateTime @default(now()) @db.Timestamptz(6)
updated_at DateTime @default(now()) @db.Timestamptz(6)
email String @unique
password String
status UserStatus @default(PENDING)
profile Profile?
role UserRole @default(ADMIN)
type UserType @default(CUSTOMER)
survey Survey?
}
model Profile {
id String @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
user User? @relation(fields: [userId], references: [id])
userId String @db.Uuid @unique
}

model Survey {
id String @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
user User? @relation(fields: [userId], references: [id])
userId String? @db.Uuid @unique
question1 String?
question2 String?
}

enum UserStatus {
PENDING
VERIFIED
}

enum UserRole {
USER
ADMIN
}

enum UserType {
CUSTOMER
INTERNAL
}

[pablo-k-neruda]

Here is the generated file attached (renamed to add .json)
index.ts.json

[pablo-k-neruda]

Downgrading Zod to 3.21.1 didn't work for me but adding usetypeassertions flag worked.

[chrishoermann]

please try setting the following options in your tsconfig.json:

strict: true,
strictNullChecks: true,

this should fix the issue.

the useTypeAssertions flag does also work but was intended as a solution for the bug with zod versions.

[bngarren]

Had same problem. Prisma v5.6.0, Zod v3.22.4, zod-prisma-types v3.1.6. Tsconfig has strict and strictnullchecks as true, didn't work. Only using 'useTypeAssertions' flag at least made the tsc errors go away.

[goern]

I think createRelationValuesTypes was key for me, here is the stuff I did: https://codeberg.org/feeldata/feeldata.app/commit/21beabe1cd6a92f9f9ad7c0b0f46ed3beeaa762f