Ability to extend `PrismaClient` class w/ Client Extensions before instantiation

## Problem Within NestJS, the common solution to implementing an injectable Prisma Client instance is to extend `PrismaClient` and add the `onModuleInit` and `enableShutdownHooks` functions required by NestJS. This typically looks like: ```ts import { Injectable, OnModuleInit, INestApplication } from '@nestjs/common' import { PrismaClient } from '@prisma/client' @Injectable() export class PrismaService extends PrismaClient implements OnModuleInit { async onModuleInit() { await this.$connect() } async enableShutdownHooks(app: INestApplication) { this.$on('beforeExit', async () => { await app.close() }) } } ``` You can use `clientExtensions` to add these functions, however, they can not adjust the type of `PrismaClient` and this scenario requires you to export a properly typed, uninstantiated class for NestJS to use. An example of adding the functions is below: ```ts const prisma = new PrismaClient().$extends({ client: { async onModuleInit() { await Prisma.getExtensionContext(this).$connect(); }, async enableShutdownHooks(app: INestApplication) { Prisma.getExtensionContext(this).$on('beforeExit', async () => { await app.close(); }); }, }, }); ``` ## Suggested solution Add a static method to `PrismaClient` that is available when using the `clientExtensions` preview features that allows you to add methods to the class (and adjust the type) before instantiation. This resulting class describe above wo

Posted by sabinadams on Apr 4, 2023, 9:19 PM

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• github (SaaS)

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