How do I build Nim library packages

I've created a nimble library package as per the documentation. When I try to build it using nimble build I get the following error.

Error: Nothing to build. Did you specify a module to build using the bin key in your .nimble file?

I can do this and it does fix the error but according to the documentation adding the bin key to the .nimble file turns my package into a binary package.

Other things I have tried:

• Use nimble install: This does not appear to verify that my code will actually compile and will happily install anything to the local package directory (I added a C# class to my .nim file, for example, and it was successfully installed).
• Use nimble c: This works but I have to pass in the path to the nim file I want to compile and the binDir entry in the .nimble file is ignored resulting in the output being placed in the same directory as the file being built. This complicates the development cycle because I have to manually clean up after the compiler.
• Use the compiler directly. This is pretty much the same as the previous option with the same flaws.

I guess I could also create a separate .nim file and import my library after it is installed but this is a big overhead for just wanting to verify that a package in the early stages of development will actually compile.

I just want to be able to verify that the source code in my library package is syntactically correct and will compile. How is this meant to be done for library packages?