Generate from `postinstall` hook is not working

Bug description

Implicit generate from postinstall hook is not working.

We figured this out because the CSB E2E test didn’t have an explicit generate and that E2E test was failing with

Error: @prisma/client did not initialize yet. Please run "prisma generate" and try to import it again

CSB test was fixed via https://github.com/prisma/e2e-tests/pull/848

How to reproduce

1. Setup a Prisma project with schema.prisma
2. yarn/npm install Prisma client
3. See logs for postinstall hook execution, the logs are dynamic and get removed by yarn, so you have to see it when it is happening
4. Write a script that uses the client (without manually running generate) and import client etc. It should not have been generated yet.

Expected behavior

Implicit generate should work.

Prisma information

2.9.0-dev.71

We understand that this broke in 2.9.0-dev.69 https://github.com/prisma/prisma/pull/3886 (not confirmed)

[Jolg42]

@divyenduz can this be closed maybe?

[NMinhNguyen]

@NMinhNguyen Do you yarn install anything after running prisma generate?

No, I’m not, I’m running yarn first. But don’t worry, I think my issue is different to this anyway.