Xrm.Tools.CRMWebAPI now supports .NET Core
We just published an update to the Nuget package for Xrm.Tools.CRMWebAPI that now includes support for .NET Core
If you find any issues please report them here https://github.com/davidyack/Xrm.Tools.CRMWebAPI/issues
Stay tuned we should be adding Typescript defintion files soon for the JavaScript version.