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Prisma + Jest reproduction and workaround

This repo reproduces a Prisma Client codegen quirk in tests and shows a small workaround to run the suite.

Prerequisites

  • Node.js 18+
  • A PostgreSQL database and DATABASE_URL environment variable

Install

npm i

Configure database

Set DATABASE_URL in your environment (adjust values to your local DB):

export DATABASE_URL="postgresql://user:password@localhost:5432/prisma_bug?schema=public"

Generate Prisma Client

npm run generate

Run tests

npm test

About the bug/workaround

  • Prisma Client generated with the current settings emits a top-level const __dirname = '/' inside generated/prisma/client.ts.
  • In Jest, this can conflict and cause import/runtime issues.
  • As a temporary, non-breaking workaround, the Jest config applies a tiny pre-test text replacement to rename that local __dirname to __prisma_dirname, and updates the call site accordingly. This avoids collisions without touching source code.

You can see the workaround near the top of jest.config.ts.