How to use Prisma transaction capabilitiles

[chrisj-back2work]

What do you want and why?

I'd like to be able to use the Prisma transaction features, including the interactive transactions (= transactions in a function block) described here https://www.prisma.io/docs/guides/performance-and-optimization/prisma-client-transactions-guide

I attempted to follow their example, using the Blitz db object (import db from "db") in lieu of their prisma object (const prisma = new PrismaClient()`). That didn't work.

I assumed the db object was equivalent to the prisma object, only augmented. However tsc complains that:

Argument of type '(tdb: any) => Promise<void>' is not assignable to parameter of type 'PrismaPromise<any>[]'.
  Type '(tdb: any) => Promise<void>' is missing the following properties from type 'PrismaPromise<any>[]': pop, push, concat, join, and 28 more.

And when I suppress that and try anyway, at runtime I get:

Uncaught TypeError: promises.map is not a function

Possible implementation(s)

1. Is there a way to access a true prisma client through db currently?
2. If no, could the Blitz db object be made a true extension of prisma?
3. If no, then we could have a longer conversation about transactions

Additional context