on 8/28/2017 7:35 AM

We are preparing for stable release, reviewing all current issues and documentation. Beta-10 solves some old (reference equality for classes) and recent (ToString for Systen.Char) issues reported. Look for VS2017 installer here (VS2015 support upcoming).


  • #734 Classes now have reference equality by default (you can override Equals as in .NET). Arrays, tuples, F# records and unions still use structural equality
  • #736 System.Char is now translated to a 1-length String in JavaScript. RPC handling and all methods dealing with Chars have been updated.
  • #742 C# 7.1 features are working.
  • #743 printf "" compiles properly.
  • #741 Guid.Empty is usable client-side.
  • #547 Numeric conversions in C# have the same semantics as F# helpers (parsing numbers, integral types truncate but no size checks).
  • #549 You can use padding numbers in C# string interpolation syntax.
  • #739 fix assembly resolution on Mono to read runtime Sitelet mertadata.
  • #746 JavaScript named functions inside inlines are preserved properly
  • #747 Stub attribute behaves in compatibile way with WS3: if all members of a class have the Stub attribute, it is equivalent to the class having it (WS does not redefine the type, it is assumed to exist in outside JS), but having any non-Stub instance members causes WS to define the class. This is fixing issues in WebSharper.JQuery.


  • #545 Nullable operators with correct semantics. In F#, you can use the FSharp.Linq.Nullable and FSharp.Linq.NullableOperators modules on the client-side. C# operations on Nullables now follow .NET semantics properly: a null value is propagated to the result.
  • #744 Static members can be proxied across multiple projects.

Breaking changes

  • If you have relied on classes having automatic structural equality in the WebSharper translation, this is now incorrect. Implement an override for Equals.
  • Create an empty JavaScript plain object with new JSObject() / New []. Previously this was equivalent to new object() / obj(), but now the latter translates to an instance of WebSharper.Obj which defines its own Equals and GetHashCode methods.
  • Default hash value of classes are now always -1. This should not be breaking, but if you use a class as keys or rely on hashing in any other way, be sure to override GetHashCode on your class for performance.
  • System.Decimal support has been removed from WebSharper main libraries. It is now a part of WebSharper.MathJS and now has correct precision.
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