How to run a postinstall script *after* the package.json file is written?

[stevebeauge]

Hi,

I'm maintaining a monorepo (around 30 packages) that has a postinstall script at the monorepo root.

This script will run a local custom script that should perform some consistency checks across all package.json files and tsconfig.json files.

However, I observe that the script runs before the package.json file is updated.

If I have monorepo with, let's say shared and app1 packages, here is what I observe:

cd /packages/app1
pnpm add @repo/shared --workspace

1. pnpm resolves the packages
2. it creates the node_modules structure
3. it runs the postinstall script of the monorepo root
4. it saves the app1's package.json file with the new dependency.

Because the app1's package.json is not already written when the postinstall script is ran, the script fails to detect the newly added packages.

Running manually the postinstall script solves the issue, but I'd like it to be automatic.

First of all, did I understand the pnpm lifecycle correctly ?

Is there anything I can do to execute my script after the package.json files are written ?

Thanks for any suggestion