Is it possible to have class based DSC resource in separate file

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  • #40174
    Profile photo of GS
    GS
    Participant

    Currently for my modules I store actual code in separate file from psm file, then dot source it and use Export-ModuleMember to export Functions, this way it allows me easily debug/test individual functions.
    I assume it's not possible since Export-ModuleMember does not give an option to export DSCResource but is it possible to have similar setup for class based DSC Resources?

  • #40177
    Profile photo of Don Jones
    Don Jones
    Keymaster

    Mmmmyyeessss. Sort of.

    Your class itself has to be one file. But the class can simply call regular functions, from a module, to perform whatever tasks it needs to perform. That keeps the code in the class itself very minimal, and is actually considered by some (including me) to be a good design pattern.

    That said, I'm not necessarily a huge fan of your module approach. I just don't like dot-sourcing – it's a very informal inclusion. I'm usually fine keeping related functions together in a .psm1; if I need to test or debug one, it's easy enough to just copy and paste it out, do what I need, and then update my module.

    So personally, my Resource approach would be to have a normal .psm1 module, with its own manifest (I rely on manifests more than Export-ModuleMember, because manifests create several advantages elsewhere in the shell), and that would do all the heavy lifting for my resource. I could then write a traditional function-based resource or a class-based resource, which simply called on the heavy-lifting functions to do all the work. I regard the resource itself (class or function-based) as an "interface" and I like to keep as little code in there as possible.

    Given the current lack of versioning support in classes, I've been sticking with function-based resources. Once that issue is addressed, it'll be easy to switch my resources, since there's essentially no code in them.

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