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`PreInstall` mainly. But `PreFetch/PreBuild` also for source-repositories, such as AUR helpers.

homebrew doesn't support hooks as a system package manager: https://github.com/ecosyste-ms/package-manager-hooks as an example.

I think the packaging ecosystem is varied enough that this should be left for the package managers to decide. Yarn allows dependency resolution and WebFetch overrides in its hooks for eg.

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> `PreInstall` mainly. But `PreFetch/PreBuild` also for source-repositories, such as AUR helpers.

I don't think this is detailed enough - what exactly should the hooks be able to do? Affect dependency resolution? Choice of versions? Are they per run or per package? Is something already downloaded so it can be inspected?

They should be able to do literally anything and everything. Treat it more like a packet in the linux networking stack, your filter chain gets run at some well defined point during the process and can query or change approximately anything.

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