If you see memory issues with Prisma in NestJS tests, upgrade to Node.js 18 or newer; that solved it for the reporters. Also make sure every test suite calls prisma.$disconnect (or app.close) so Prisma cleans up its resources. Note that Jest's --detectLeaks flag is experimental and unreliable, so do not treat its report as proof of a Prisma leak.

_Source: gh:prisma/orm#17925 (Prisma)_