Property '$on' is missing in type

[JoshuaM1995]

I'm using a custom prisma client, and for some reason I'm getting TypeScript errors. They appear to be related to the prisma client type not matching the type in the package.

Here's my custom prisma module:

CustomPrismaModule.forRootAsync({
  name: 'PrismaService',
  useFactory: () => prismaClient,
  isGlobal: true,
}),

My custom prisma client:

import { PrismaClient } from '@prisma/database';
import { userSubscriptionIsActiveModelExtension, userSubscriptionIsActiveResultExtension } from './extensions';

export const prismaClient = new PrismaClient(
  process.env.NODE_ENV !== 'dev'
    ? {
        datasources: {
          db: {
            url: process.env.DATABASE_URL,
          },
        },
      }
    : undefined,
)
  .$extends(userSubscriptionIsActiveResultExtension)
  .$extends(userSubscriptionIsActiveModelExtension);

export type ExtendedPrismaClient = typeof prismaClient;

And here's the error:

Property '$on' is missing in type 'DynamicClientExtensionThis<TypeMap<Args & { result: { userSubscription: { isActive: () => { needs: { endsAt: true; isLifetime: true; paymentStatus: true; isOnFreeTrial: true; }; compute({ endsAt, isLifetime, paymentStatus, isOnFreeTrial }: { endsAt: Date | null; isLifetime: boolean; paymentStatus: StripePaymentStatu...' but required in type 'PrismaClientLike'.ts(2741)

When I comment out the $extends in the custom prisma client, the error goes away. I followed the documentation and it was working at one point. I'm not sure if one of the latest updates broke it? Here are my versions:

@prisma/client: 4.16.1
prisma: 4.16.1
nestjs-prisma: 0.20.1

[marcjulian]

Hi @JoshuaM1995 have a look at the extensions example which uses $on with an extended PrismaClient

Extended Prisma Client

nestjs-prisma/examples/extensions/src/prisma.extension.ts

Lines 3 to 13 in 2b93c9e

	export const extendedPrismaClient = new PrismaClient<
	Prisma.PrismaClientOptions,
	'query' | 'info' | 'warn' | 'error'
	>({
	log: [
	{ level: 'query', emit: 'event' },
	{ level: 'info', emit: 'event' },
	{ level: 'warn', emit: 'event' },
	{ level: 'error', emit: 'event' },
	],
	}).$extends({

Use $on

nestjs-prisma/examples/extensions/src/main.ts

Line 13 in 2b93c9e

customPrismaService.client.$on('error', (e) => {});

[marcjulian]

I tested the extensions example with the latest prisma version 4.16.1 and I am seeing the same error as you:

src/prisma.extension.ts:25:22 - error TS2339: Property '$on' does not exist on type 'DynamicClientExtensionThis<TypeMap<Args & { result: {}; model: { user: { findByEmail: () => (email: string) => Promise<GetResult<{ id: string; email: string; name: string; }, { [x: string]: () => unknown; }> & {}>; }; }; query: {}; client: {}; }>, TypeMapCb, { ...; }>'.

25 extendedPrismaClient.$on('query', (e) => {});

This might be an issue with the latest prisma version. Either $on is missing in the types or it is not available any longer for extended PrismaClients.

[marcjulian]

@JoshuaM1995 I found the following issue about disallowing $on for extended clients: prisma/prisma#19552 (comment)

You can find it also in the release notes from 4.16.0

[JoshuaM1995]

@JoshuaM1995 I found the following issue about disallowing $on for extended clients: prisma/prisma#19552 (comment)

You can find it also in the release notes from 4.16.0

Thanks for looking into this. Are there any plans for supporting Prisma 4.16.0 any time soon? I can help contribute if possible.

If not I can try downgrading. That was the first thing I tried, but even after downgrading @prisma/client and prisma in my package.json files (I'm in a monorepo), I still see it generating the client with 4.16.0. I even tried using npx to generate it with a specific version of the cli, with no luck.

[JoshuaM1995]

Also, maybe it would be safer to lock prisma to a patch version in the package.json? @marcjulian

"@prisma/client": "~4.13.0"

[JoshuaM1995]

Update: I was able to solve this temporarily with PNPM by adding this to my package.json:

"pnpm": {
    "overrides": {
      "@prisma/client": "4.15.0",
      "prisma": "4.15.0"
    }
  }

[marcjulian]

@JoshuaM1995 I have update it to the latest prisma client and added support for extension GA. Please try it out with the latest dev release:

npm i nestjs-prisma@0.21.0-dev.3

[marcjulian]

This has been released with 0.21.0