nest.js service from prisma $extends (type 2)

DatabaseService.ts

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

@Injectable()
export class DatabaseService
    extends PrismaClient
    implements OnModuleInit, OnModuleDestroy
{
    constructor() {
        super()

        const self = this

        Object.assign(
            this,
            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 self.topBanner.create({
                                    data: {
                                        title: faker.commerce.product(),
                                        url:
                                            'https://papago.naver.com/' +
                                            result.title,
                                    },
                                }),
                            )

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

    async onModuleInit() {
        await this.$connect()
    }

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