Export Transaction type

[ziimakc]

Problem

When using "Custom models" and "Interactive Transactions" #8664 you may want to call some operations on model and pass in current transaction. For type safety and to be consistent with latest prisma version you need a Transaction type:

export class SomeModel {
  static async someCheckOrOperation(transaction: Transaction) {
    const res = await transaction.some.findFirst();

    if (!res) {
      throw new Error();
    } else {
      doSomething();
    }
  }
}

Currently there is no way to pick this type from PrismaClient.$transaction and you forced to redefine it, that can became inconsistent with new prisma versions:

  $transaction<R>(fn: (prisma: Omit<PrismaClient, '$connect' | '$disconnect' | '$on' | '$transaction' | '$use'>) => Promise<R>, options?: { maxWait?: number, timeout?: number }): Promise<R>;

Suggested solution

Add Transaction type somewhere where it will be possible to import it:

export type Transaction = Omit<PrismaClient, '$connect' | '$disconnect' | '$on' | '$transaction' | '$use'>;

[ziimakc]

Exported as Prisma.TransactionClient