Get prisma in cf workers

getPrismaClient.ts

import { PrismaClient } from "@prisma/client";
import { PrismaPg as PrismaPgWorker } from "@prisma/adapter-pg-worker";
import { Pool } from "@prisma/pg-worker";

let _db: PrismaClient | null = null;

export async function getPrismaClient(env: Env): Promise<PrismaClient> {
  if (_db) return _db;
  if (import.meta.env.DEV) {
    const { default: pg } = await import("pg");
    const { PrismaPg } = await import("@prisma/adapter-pg");
    const pool = new pg.Pool({
      connectionString: env.DATABASE_URL + "&connection_limit=1",
    });
    const adapter = new PrismaPg(pool);
    _db = new PrismaClient({ adapter });
    return _db;
  } else {
    const pool = new Pool({
      connectionString: env.DATABASE_URL,
    });
    const adapter = new PrismaPgWorker(pool);
    _db = new PrismaClient({ adapter });
    return _db;
  }
}