nest.js service from prisma $extends (type 1)

DatabaseService.ts

import { Injectable, OnModuleDestroy, OnModuleInit } from '@nestjs/common'
import { PrismaClient } from '@prisma/client'
import { faker } from '@faker-js/faker' // 샘플 문자열 생성 용도

@Injectable()
export class DatabaseService
    extends getExtendedClient()
    implements OnModuleInit, OnModuleDestroy
{
    async onModuleInit() {
        await this.$connect()
    }

    async onModuleDestroy() {
        await this.$disconnect()
    }
}

// https://github.com/prisma/prisma/issues/18628#issuecomment-1584985619
function getExtendedClient() {
    const extendedClient = () => {
        // extends 안에서 client를 추출할 다른 방법을 못 찾아서 직접 client 변수를 선언
        const client = new PrismaClient().$extends({
            name: 'webinarAfterCreate',
            query: {
                webinar: {
                    async create({ args, query }) {
                        console.log('webinarAfterCreate', args)
                        const result = await query(args)
                        console.log(result)

                        // afterCreate logic
                        console.log(
                            await client.topBanner.create({
                                data: {
                                    title: faker.commerce.product(),
                                    url:
                                        // 이미 create가 끝난 webinar의 값을 참조할 수 있음
                                        'https://papago.naver.com/' +
                                        result.title,
                                },
                            }),
                        )

                        return result
                    },
                },
            },
        })
        return client
    }

    return class {
        constructor() {
            return extendedClient()
        }
    } as new () => ReturnType<typeof extendedClient>
}