P
Prisma•19h ago
Vinicius Gonçalves

Export extended Prisma client types

Greetings, I'm trying to export an extended Prisma client types from a library package that is meant to be use through multiple NestJS applications. This package contains: - Prisma schema - postinstall script to generate the prisma client and build the src/client.ts file with the extended client source code. Code: 
// @org/database
import { PrismaClient } from '#client';
import { softDeleteExtension } from '#extensions/soft-delete.js';

type ExtendedPrismaClient = ReturnType<typeof generatePrismaClient>;
type ExtendedPrismaClientOptions = ConstructorParameters<typeof PrismaClient>[0];

function generatePrismaClient(args: SoulloopPrismaClientOptions) {
  return new PrismaClient(args).$extends(softDeleteExtension);
}

export * from '#client';
export { generatePrismaClient };
export type { SoulloopPrismaClient, SoulloopPrismaClientOptions };
// @org/database
import { PrismaClient } from '#client';
import { softDeleteExtension } from '#extensions/soft-delete.js';

type ExtendedPrismaClient = ReturnType<typeof generatePrismaClient>;
type ExtendedPrismaClientOptions = ConstructorParameters<typeof PrismaClient>[0];

function generatePrismaClient(args: SoulloopPrismaClientOptions) {
  return new PrismaClient(args).$extends(softDeleteExtension);
}

export * from '#client';
export { generatePrismaClient };
export type { SoulloopPrismaClient, SoulloopPrismaClientOptions };
// @org/api-1: ./src/prisma/prisma.provider.ts
import type { SoulloopPrismaClientOptions } from '@org/database'

const Options: SoulloopPrismaClientOptions // resolves to any
// @org/api-1: ./src/prisma/prisma.provider.ts
import type { SoulloopPrismaClientOptions } from '@org/database'

const Options: SoulloopPrismaClientOptions // resolves to any
3 Replies
Prisma AI Help
Prisma AI Help•19h ago
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Prisma AI Help
Prisma AI Help•19h ago
It’s expected that an extended client’s type is not PrismaClient, and you must infer/export the extended type yourself. The docs recommend wrapping client creation and exporting the return type: 
// @org/database
import { PrismaClient } from '#client';
import { softDeleteExtension } from '#extensions/soft-delete.js';

export function generatePrismaClient(options?: ConstructorParameters<typeof PrismaClient>[0]) {
  return new PrismaClient(options).$extends(softDeleteExtension);
}

export type ExtendedPrismaClient = ReturnType<typeof generatePrismaClient>;
export type ExtendedPrismaClientOptions = ConstructorParameters<typeof PrismaClient>[0];

export * from '#client';
// @org/database
import { PrismaClient } from '#client';
import { softDeleteExtension } from '#extensions/soft-delete.js';

export function generatePrismaClient(options?: ConstructorParameters<typeof PrismaClient>[0]) {
  return new PrismaClient(options).$extends(softDeleteExtension);
}

export type ExtendedPrismaClient = ReturnType<typeof generatePrismaClient>;
export type ExtendedPrismaClientOptions = ConstructorParameters<typeof PrismaClient>[0];

export * from '#client';
(“Type of an extended client” guidance) (Type of an extended client). Then in your NestJS app: 
// @org/api-1: ./src/prisma/prisma.provider.ts
import type { ExtendedPrismaClientOptions } from '@org/database';

const options: ExtendedPrismaClientOptions = { /* ... */ };
// @org/api-1: ./src/prisma/prisma.provider.ts
import type { ExtendedPrismaClientOptions } from '@org/database';

const options: ExtendedPrismaClientOptions = { /* ... */ };
If you prefer a singleton-style factory in the library, the docs also show using ReturnType with a factory function, which preserves the extended type when exported across packages (e.g., in a Turborepo, they export an extended prisma instance and types from a database package) (Type of an extended client, Export client and types). If your ExtendedPrismaClientOptions is resolving to any, ensure: - You export the type alias derived from ConstructorParameters<typeof PrismaClient>[0] from the library entrypoint. - Your consumer imports that alias (not re-deriving it). - Type generation/build order runs before publishing/consuming (as in the Turborepo guide) ([Export client and types](<https://www.prisma.io/docs/guides/turborepo#24-export-the-prism
How to use Prisma ORM with Turborepo | Prisma Documentation
Learn step-by-step how to integrate Prisma ORM with Turborepo to build modular, scalable monorepo architectures efficiently.
Prisma AI Help
Prisma AI Help•19h ago
a-client-and-types>)). Note: Extensions return a new client; they don’t mutate the original, so types must flow from the factory/instance you export (Argument of type 'DynamicClientExtensionThis'…). 🤔 Alright, thanks for letting us know that there's still some help needed. A team member will reply to you shortly. In the meantime, please let us know any additional info, questions, or which parts of the answer may need clarification.

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