WebSharper 4 beta now has F# 4.1 and C# 7 language support.

Latest Visual Studio template installers compatible with VS2015/2017 is available here.

Enhancements

• #689 Added support for F# 4.1 and C# 7 new language features.
• #596 Automatic download of remote web resources to serve from locally. Set <WebSharperDownloadResources>True</WebSharperDownloadResources> in your project file to have WebSharper download all remote js/css defined in current project and all references. Add <add key="UseDownloadedResources" value="True" /> to your <appSettings> section in web.config.
• #696 Parameterless union cases of a JavaScript-annotated union translate to a singleton instance for performance. Equality checks are optimized for these cases to just check the tag.
• #638 Added Warn attribute, calls to annotated member will generate a warning wherever it is called from client-side code.
• #693 F# multi-type trait calls translate but still are not supporting overloads. F# + and - operators properly translate to the operator defined by the type.
• #703 Stub classes with a base class do not emit a new class overwriting outside one.

UI.Next

• #117 IE compatibility: use DomElement.parentNode, not parentElement.
• Implement the revised templating engine for C#.

Fixes

• #697 Union with Constant case will have no prototype implicitly (instance methods compiled to static)
• #598 RPC signature hash computing is now platform-independent.
• #702 C# conditional compilation symbols are properly respected for translation with WebSharper.
• #705 JQuery is linked from https