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Subject: Re: Reacting to package load
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 (message from Psionic K on Sat, 25 Nov 2023 21:54:47 +0900)
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> From: Psionic K <psionik@positron.solutions>
> Date: Sat, 25 Nov 2023 21:54:47 +0900
> 
> I need a strategy to detect when a package is loaded so I can look for a
> header (or predetermined override) to install non-elisp dependencies for
> that package.
> 
> If there's a hook or functions variable, I can't guess the name.  Not sure
> where I might add advice if that's the best available approach.

Is eval-after-load what you had in mind?