Hi my dear blog readers!
First of all, happy holidays! Now I’m back to joining Sergey Tihon’s F# advent blog 2018 gathering!
My past 2017 advent blog is available here: https://fsharpmonologue.blogspot.com/2017/12/advent-2017-current-state-of-f-4x.html
In this blog entry, I bring you the states of F# news and updates in two major subtopics: the tooling ecosystem, and the community surroundings.
F# state in December 2018
A lot has happened in 2018, particularly the progress that has been made from Microsoft, F# communities, and the whole cool participations on F# github repo.
To increase clarity, let’s start discussing F# tooling ecosystem.
F# tooling ecosystem updates
The F# tooling is basically evolved since 2005 (as research project before integrated in Visual Studio) into these components:
- F# Language Specification
- F# Compiler
- F# Core libraries
- F# Compiler Services (since 2013)
Note that although F# Compiler Services derives from F# Compiler, the F# Compiler Services is very important. Because it brings parity with Roslyn as compiler service. It is also a good sample of having the compiler created with the language you want to compile.
Thanks to its flexibility and power, F# Compiler Services can be used as true component, and it is suitable to be used as language services.
Ionide use F# Compiler Services heavily to provide F# support in Visual Studio Code, and it enjoys many features available in Visual Studio.
Now in Visual Studio 2017 from 15.6, these are the noteworthy F# updates:
- Versioning model has been changed to decouple from Visual Studio version releases. This brings F# tooling more freedom and flexibility to progress further, although F# tooling is closely related to a VS release, as described in this RFC of F# versioning plan on GitHub. A follow up article by Phillip Carter brings more detail that VS 2017 15.7.x has F# 4.4, and 15.8.x has F# 4.5, like the captured table below. Note: there will be no 4.2, 4.3 version, it will be version 4.5 or later.
- Related to previous point, VS 2017 15.7 will have F# 4.5. And this version will be the same version as F# Compiler Service related iteration.
- F# supports the same semantic of ValueTuple as Struct tuple (since 15.6). This brings closer compatibility with the .NET class library of ValueTuple in .NET Framework 4.7.
- F# supports full file ordering for .NET Core 2.0 or later project (since 15.6)
- Realtime multi TFM targeting (a.k.a. multi targeting in .NET team blog, since 15.6). This brings unique experience compared to other language tooling such as C#/VB, because C#/VB doesn’t have this yet!
- Go to definition from the member tooltip (since 15.6)
- Removal of dependency to Windows 10 SDK (since 15.6). This brings less size and leaner requirement to have F# development.
- ..and many more in 15.6! For more detail, please visit this official blog post: https://blogs.msdn.microsoft.com/dotnet/2018/03/06/f-language-and-tools-update-for-visual-studio-2017-version-15-6/
This is the versioning illustration:
This is nicely documented as RFC in F# Language Design repo in https://github.com/fsharp/fslang-design/blob/master/tooling/FST-1004-versioning-plan.md
In 15.7, F# tooling keeps updated too. These are the noticeable updates:
- New F# template for ASP.NET Core 2.0 project! This is a very amazing progress since 15.5, because now we could create ASP.NET Core using F#
- Enabled generating F# AssemblyInfo from properties with the F# compiler in the .NET SDK. This is not trivial but it is closer to C#/VB feature to support common AssemblyInfo infrastructure that common in C#/VB project.
A quick hands-on sample to use F# new ASP.NET Core template is by executing “dotnet new web –lang f#” like this illustration: (I run against .NET Core 3.0 Preview 1)
Now let’s see what’s inside this folder:
Looking at the content of Program.fs, we now see that we have the same quick start from C# template:
This code implies that we use Kestrel by default.
To be maximally applicable to use F# with ASP.NET Core, I recommend to use Visual Studio Code 1.28 with the updated Ionide.
Now, the other wonderful things happened since July 2018 are the updates from communities!
Bonus fun fact of Microsoft F# repo: it uses Azure DevOps since June as the main CIs!
F# community tooling update
These are the best updates from community so far:
- Paket now supports .NET Core 2.2 and .NET Core 3.0 as one of its TFM support since 5.181.0.
- Fable is reaching version 2.1, and it has tons of bug fixes
That’s it folks!!
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