[TS] Passing object/data from CF Functions middleware to function handlers

I would like to setup Prisma in a functions _middleware.ts like:

import { PrismaClient } from '@prisma/client';
import { PrismaD1 } from '@prisma/adapter-d1';

export const onRequest: PagesFunction<Env> = async (context) => {
    const adapter = new PrismaD1(context.env.DB);
    const prisma = new PrismaClient({ adapter });

    // now store prisma so it's available in function hadlers!
    context.env.prisma = prisma;
    // or
    context.data.prisma = prisma;

    return await context.next();
}

import { PrismaClient } from '@prisma/client';
import { PrismaD1 } from '@prisma/adapter-d1';

export const onRequest: PagesFunction<Env> = async (context) => {
    const adapter = new PrismaD1(context.env.DB);
    const prisma = new PrismaClient({ adapter });

    // now store prisma so it's available in function hadlers!
    context.env.prisma = prisma;
    // or
    context.data.prisma = prisma;

    return await context.next();
}

I have a wrangler types functions/worker-configuration.d.ts generated file that looks like:

// Generated by Wrangler on Fri Apr 05 2024 23:40:46 GMT+0200 (Central European Summer Time)
// by running `wrangler types functions/worker-configuration.d.ts`

interface Env {
  DB: D1Database;
}

// Generated by Wrangler on Fri Apr 05 2024 23:40:46 GMT+0200 (Central European Summer Time)
// by running `wrangler types functions/worker-configuration.d.ts`

interface Env {
  DB: D1Database;
}

In my function handler I would like to use prisma client (type-safe) like:

export const onRequestGet: PagesFunction<Env> = async (context) => {
  // TODO: get typed prisma client
  const pets = await prisma.pet.findMany();
  return Response.json(pets);
};

export const onRequestGet: PagesFunction<Env> = async (context) => {
  // TODO: get typed prisma client
  const pets = await prisma.pet.findMany();
  return Response.json(pets);
};

How should I pass the prisma client best? Via context.env or context.data ? And how to type it?

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[TS] Passing object/data from CF Functions middleware to function handlers