WebSharper 4 beta-9

Zafir.4.0.177.78-beta9

Fixes

• #719 beta8 had a serious bug where it generated unsafe accesses to global object at the top of the scripts, this is now fixed, but not reverting the change to shorten outside addresses, see the note about breaking change below.

Improvements

• #722 Auto-hash WebSharper-generated output and files included as WebResource, use this hash on generating links to avoid browsers caching an outdated version. This is an automatic feature, no configuration currently.
• #725 Client-side JSON can de/serialize custom classes. (Serializable attribute and default constructor are not required as on the server.)
• #726 Not creating .js file for an assembly containing only inlined code
• #715 Client-side JSON module is visible as WebSharper.TypedJson from C# to avoid name conflict.
• #723 JavaScript(false) on an interface opts-out of default interface handling on client-side, allows for more divergence of client/server behavior when needed.
• #724 optional analyzer for closures, helping to avoid some classes of memory leaks in JavaScript.

There is an inconvenient source of memory leaks in most JavaScript engines: captured variables are tied to a Context object and even functions that do not use some (or any) variables from a Context still retain the whole object. This is described well here: http://point.davidglasser.net/2013/06/27/surprising-javascript-memory-leak.html

Adding a WebSharperAnalyzeClosures project property gives warnings on these kinds of captures, helping to eliminate memory leaks.

Usage: <WebSharperAnalyzeClosures>True</WebSharperAnalyzeClosures> or <WebSharperAnalyzeClosures>MoveToTop</WebSharperAnalyzeClosures>. The latter additionally moves all non-capturing lambdas to top level automatically (experimental).

Breaking change

• Previously, having [<Inline "myLibrary.doSomething()">] and [<Inline "$global.myLibrary.doSomething()">] was working equivalently. Now access to global scope without the $global object is assumed to be initialized before the current script starts running (WebSharper itself takes care of this, if you use the Require attribute) and will not change, so it is safe to shorten. Whenever you want the exact call on the current global scope (window object), be sure to use $global.

WebSharper 4 beta-8

Zafir.4.0.171.72-beta8

Fixes and improvements

• #717 Fixed exponential compile time on chained method/property calls
• #716 C# helper for constructing a custom plain JavaScript object: new JSObject() { { "background-color", "#666" } }
• #709 Remove unnecessary variables around inlines. Also stronger optimizations for conditionals, function .apply and array .concat to reduce translated code size and make it more readable.

WebSharper 4 beta-7 bugfix-2

Zafir.4.0.171.72-beta7

Fixes and improvements

• #711 Add missing methods to WebSharper.JavaScript.Window object.
• #712 Erased unions and options (WebSharper.JavaScript.Union and WebSharper.JavaScript.Optional) has implicit conversion operators to/from their type parameters for clean usage from C#.

WebSharper 4 beta-7 bugfix-1

Zafir.4.0.170.71-beta7

Fixes

• #708 The * operator in F# can be resolved to an operator member defined by the type
• #707 When additional setters on a plain object are collected into a single object literal, the additional fields has correct code order

WebSharper 4 beta-7

Zafir.4.0.169.70-beta7

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

WebSharper 4 beta-6 bugfix-6

Zafir.4.0.161.45-beta6

We are working on F#4.1+C#7 support, coming soon, now releasing some fixes and a new template installer for Visual Studio 2015/2017. Download latest here: http://websharper.com/Zafir.vsix

Thanks to @FilippoPolo for submitting a bug report.

Fixes

• #695 JavaScript property getter expressionss are not moved during optimization when there are any side-effecting code between.
• Offline sitelets work for Endpoint types without structural equality, making it easily usable from C#, there is a new template for it.

WebSharper 3.6.20

Fixes

• #562 Field types are included when calculating code dependencies. This solves an issue when an RPC is returning a type in a field of the return value that is contained in an assembly that is not used directly. Previously the .js link to the generated code of this library was missing, resulting in a runtime error when looking up the prototype.
• #688 Websharper 3.6 is now compatible with FSharp.Core 4.1. (Full F# 4.1 language support is coming with WebSharper 4.0 soon.)
• CanvasElement and MediaElement inherit from Element

WebSharper 4 beta-6 bugfix-5

Zafir.4.0.160.40-beta6

Thanks to @cgravill and @amieres for submitting bug reports.

Fixes

• #681 Return was missing so infinite loop was generated on a module-level let rec returning unit
• #682 Mark arguments transformed in tail recursion optimization as mutable to avoid incorrect inlining which could result in invalid JS code
• #680 Do not eta-reduce to expressions that has side effects so needs the closure
• #666 Ignore duplicate references when initializing Sitelets in non-ASP.NET contexts, fail only on WS assemblies with different versions.
• #684 Fix for JavaScript statements in Inline to not drop first statement if it was an expression
• #685 Different Name and AssemblyName in F# does not cause errors

Improvements

• #683 You can now opt-out of dead code elimination for SPA projects. Use <WebSharperDeadCodeElimination>False</WebSharperDeadCodeElimination> in the project file or add --dce- to the wsfsc.exe command line.
• #686 Case test for erased unions with a case which is a plain object in JS now compiles, if there is no previous case that is also a plain object, then it gives a more specific error

Breaking changes

• #670 By default, classes (including F# records and unions) with no methods translated to JS instance methods and having no base class are now translated not to have a prototype. JSON serializer was fixed to handle this. This is a performance optimization, but disallows type checks or inheriting from a class like this. So a new attribute Prototype was added to opt-in for generating a prototype for the type in the translation. Extra features: Prototype(false) forces the type to have no prototype, converting instance methods to static in translation.

WebSharper 4 beta-6 bugfix-4

Zafir.4.0.159.36-beta6

Fixes

• #668 Printing WebSharper errors with full file path and correct source position format so it shows up in Visual Studio

WebSharper 4 beta-6 bugfix-3

Zafir.4.0.158.33-beta6

Fixes

• #668 Printing F# compilation errors and warnings as compiling with fsc.exe would, respecting nowarn, warn, warnon, warneserror flags
• #667 Fix C# analyzer giving failure warnings on build
• #669 Async.StartImmediate and Async.StartWithContinuations now start the async immediately as in .NET, possibly finishing synchronously if they contain no bind/combine.
• #671 Fix a translation bug in optimization around calling curried instance members
• #673 integer type Parse and TryParse methods follow .NET semantics, checking boundaries and disallowing fractions
• #677 Fix using Inline on constructors calling into other constructors
• #678 Fix inlining JavaScript statements, and using return to produce a value
• #679 exception properties Message and InnerException should work for all exception types
• #676 Queue and Stack constructors taking a seq<'T> (IEnumerable<T>)