Has anyone been able to use preResolution?

[TrevorBurnham]

3 years ago, pnpm added support for preResolution, a hook that runs before resolution. I still see it in the codebase, but:

1. I don't see any examples in the wild of .pnpmfile.cjs files that use it (as opposed to fetchers), where I see at least one experiment).
2. When I try calling it, nothing happens: https://codesandbox.io/p/devbox/late-grass-7lh3p3

Steps to replicate:

1. Go to that CodeSandbox
2. Run yarn exec pnpm --config.pnpmfile=.pnpmfile.cjs install

I'm trying to implement custom resolutions, like you can do with yarn plugins.

[zkochan]

Currently preResolution and the custom fetchers are used by stackblitz in proprietary code, I guess. You can only load them from a global pnpmfile. So if you declare them in a local pnpmfile, they will be ignored. But we will change that soon: #9447

We will also add hooks for writing custom resolvers. The docs will be updated with all these hooks after finishing the mentioned PR. There are 2 companies that want to use pnpm with their custom resolvers and fetchers.

[TrevorBurnham]

Thanks, I'll sit tight then. Looking forward to custom resolvers and fetchers! 🚀