This is our first release of WebSharper 3.0-alpha with a new feature: source mapping. If you enable it on your project, you can see the F# sources in your browser and set breakpoints in it.

Source maps

• You can enable including source maps and the required source files in a WebSharper assembly, by adding the

      <WebSharperSourceMap>True</WebSharperSourceMap>
  

  property to your project file.

• To unpack the source maps in your web project, add this same property to the project file, and

      <staticContent>
          <mimeMap fileExtension=".fs" mimeType="text/plain" />
      </staticContent>
  

  inside the web.config file's <system.webServer> element.

• It is also recommended to set

      <OtherFlags>--quotations-debug</OtherFlags>
  

  to have source position information inside reflected definitions available for WebSharper. Otherwise only the starting lines of functions can be mapped.

• Single-Page Application projects are currently not supported.

• In Google Chrome, you need to check the "Enable JavaScript source maps" setting in Developer Tools Settings.

• For Internet Explorer, you need to have Windows 8.1 Update 1.

• websharper.exe also has new flag -sm for source map embedding/unpacking.

Sitelets improvements

• We added combinators to simplify writing Sitelets for sub-actions and embedding them into Sitelets for wider actions. See issue #307 for more details about these combinators.

WIG improvements

• Added ObsoleteWithMessage function, with it you can specify a message for the obsolete warning.