I ported my TFS API code to use the V12 (2013) assemblies. I then built and created a NuGet package of the TFS API Lib and installed it in an application. Immediately that application build failed because the Microsoft.WITDataStore.dll assmebly was missing from my TFS API NuGet package.
I found that by default, when the reference tag is not used at all, NuGet adds all files included in the lib folder as references. I needed the Microsoft.WITDataStore.dll in the package lib folder, but not added as as a reference (this fails).
The solution was to update my NuSpec file to explicitly mark the files I wanted added as references to the project.
<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
<metadata>
<id>ALM.Tools.TfsApiLib</id>
<version>0.0.0.0</version>
<authors>Bob Hardister</authors>
<description>A set of methods to get and set information in TFS 2013</description>
<summary>Library of TFS API Methods.</summary>
<dependencies>
<dependency id="RavenDB.Client" version="2.5.2910" />
</dependencies>
<references>
<reference file="Microsoft.TeamFoundation.Build.Activities.dll" />
<reference file="Microsoft.TeamFoundation.Build.Client.dll" />
<reference file="Microsoft.TeamFoundation.Build.Common.dll" />
<reference file="Microsoft.TeamFoundation.Build.Workflow.dll" />
<reference file="Microsoft.TeamFoundation.Client.dll" />
<reference file="Microsoft.TeamFoundation.Common.dll" />
<reference file="Microsoft.TeamFoundation.VersionControl.Client.dll" />
<reference file="Microsoft.TeamFoundation.VersionControl.Common.dll" />
<reference file="Microsoft.TeamFoundation.WorkItemTracking.Client.dll" />
<reference file="Microsoft.TeamFoundation.WorkItemTracking.Common.dll" />
<reference file="Microsoft.TeamFoundation.WorkItemTracking.Proxy.dll" />
<reference file="NLog.dll" />
<reference file="TfsApiLib.Tool.Methods.dll" />
<reference file="TfsApiLib.Tool.RunProcess.dll" />
</references>
</metadata>
<files>
<file src="bin\$configuration$\Microsoft.TeamFoundation.*" target="lib\net45" />
<file src="bin\$configuration$\Microsoft.WITDataStore.dll" target="lib\net45" />
<file src="bin\$configuration$\NLog.dll" target="lib\net45\NLog.dll" />
<file src="bin\$configuration$\TfsApiLib.Tool.*" target="lib\net45" />
</files>
</package>