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# general
s
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m
What exactly do you mean by "interoperate with other modules"?
b
@microscopic-florist-22719 I write a definition of cloud resources in a function within module A. I want to call that function within module B with parameters that specialize it for my use case there
h
I've got a local ts module shared by different pulumi programs. It just declares pulumi as a dependency, and the pulumi programs then npm install that local module. So it definitely works!
m
Okay. Pulumi JS/TS just uses normal JS/TS modules for this.
b
@microscopic-florist-22719 I got that far, I'm wondering how the backend behavior works
h
Providers and things are passed down via parent resources or a global top level resource (the stack it self I think)
b
i.e, if I export a function from A and it constructs Pulumi resources, those will belong transitively to the top level stack when that stack invokes 
A.fn()
?
m
Yes.
b
(that's what I would expect, I just wanted to make sure
Awesome. Perfect. Unsurprising. Thank you. 🙂
Actually one other question then - so those depended-upon modules should have Pulumi as 
peerDependencies
, yeah?
m
We generally use actual 
dependencies
b
(to avoid version constraints/multiple instances of 
@pulumi/pulumi
in the runtime)
Huh, does that not trip you up with versions?
m
It does--we go out of our way to make this work
But we definitely still have bugs here, and we may end up going the route of 
peerDependencies
in the future.
b
Aah. So if your developers are, cough cough, a little less careful, would peer dependencies be a good idea?
(Mine are.)
m
Ideally the 
@pulumi/pulumi
module will handle this situation gracefully and you should still be able to use real 
dependencies
, but 
peerDependencies
should unwedge you if we have bugs 🙂
b
Yeah - I have written my share of plugin architecture JS, hence the question
That's awesome, though. One other question but I'll ask it in another thread as it's unrelated
m
👍
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