[swift-build-dev] advice on best practices for transitive dependencies

[Vadim Eisenberg]

Ankit, let me rephrase the question. I will use term "package X directly 
depends on package Y, if package X uses classes defined in package Y. So 
the rephrased question is:

Suppose I have package A, that directly depends on both package B and 
package C. Package B directly depends on package C.


For package A, I have to specify dependency on package B. Should I also 
specify dependency on package C in package A, if I know for sure that 
package B depends on package C, so package C will be fetched by SwiftPM 
anyway.

Vadim Eisenberg
 



From:   Ankit Aggarwal <ankit_aggarwal at apple.com>
To:     Vadim Eisenberg/Haifa/IBM at IBMIL
Cc:     swift-build-dev at swift.org
Date:   12/08/2016 04:18 PM
Subject:        Re: [swift-build-dev] advice on best practices for 
transitive dependencies
Sent by:        ankit_aggarwal at apple.com




> On 08-Dec-2016, at 7:40 PM, Vadim Eisenberg via swift-build-dev 
<swift-build-dev at swift.org> wrote:
> 
> Hello,
> 
> I have a question regarding best practices for transitive dependencies. 
> Suppose I have package A, that depends on (uses classes from) package B 
> and package C. Package B also depends on package C.
> 
> 
> For package A, I have to specify dependency on package B. Should I also 
> specify dependency on package C, if I know for sure that package B 
depends 
> on package C, so package C will be fetched by SwiftPM anyway.
> 

You should only specify the dependencies on packages you directly want to 
use.
So, if your package A wants to use classes from B but not from C and B 
depends on C
then you shouldn't specify C as dependency in A. But in this case you 
should never use 
any of the classes defined in C from package A? this is something we'd 
like to enforce but can't at the moment.

> Vadim Eisenberg
> 
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