Update to Fable 3

Author: alfonsogarciacaro

.config/dotnet-tools.json

@@ -7,6 +7,12 @@
       "commands": [
         "fsdocs"
       ]
+    },
+    "fable": {
+      "version": "3.4.2",
+      "commands": [
+        "fable"
+      ]
     }
   }
-}
+}

.github/workflows/pull-request.yml

@@ -13,7 +13,13 @@ jobs:
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: '5.0.202'
+    - name: Setup Node.js environment
+      uses: actions/[email protected]
+      with:
+        node-version: 14.17.*        
     - name: Install tools
       run: dotnet tool restore
-    - name: Build Test and Docs using FAKE 
-      run: dotnet fake build
+    - name: Test Fable
+      run: cd tests/fable && npm i && npm test && cd ../..
+    - name: Build and Test 
+      run: dotnet test -c Release

src/FSharp.Control.AsyncSeq/AsyncSeq.fs

@@ -109,11 +109,7 @@ module internal Utils =
       /// when implementing the Subscribe method of IObservable interface.
       static member StartDisposable(op:Async<unit>) =
           let ct = new System.Threading.CancellationTokenSource()
-          #if !FABLE_COMPILER
           Async.Start(op, ct.Token)
-          #else
-          Async.StartImmediate(op, ct.Token)
-          #endif
           { new IDisposable with
               member x.Dispose() = ct.Cancel() }
 
@@ -216,16 +212,9 @@ module AsyncGenerator =
 
 
     static member Bind (g:AsyncGenerator<'a>, cont:unit -> AsyncGenerator<'a>) : AsyncGenerator<'a> =
-      #if !FABLE_COMPILER
       match g with
       | :? GenerateCont<'a> as g -> GenerateCont<_>.Bind (g.Generator, (fun () -> GenerateCont<_>.Bind (g.Cont(), cont)))
       | _ -> (new GenerateCont<'a>(g, cont) :> AsyncGenerator<'a>)
-      #else
-      let g' = g :?> GenerateCont<'a>
-      if unbox<AsyncGenerator<_> option>(g'.Generator).IsSome then
-        GenerateCont<_>.Bind (g'.Generator, (fun () -> GenerateCont<_>.Bind (g'.Cont(), cont)))
-      else (new GenerateCont<'a>(g, cont) :> AsyncGenerator<'a>)
-      #endif
 
   /// Right-associating binder.
   let bindG (g:AsyncGenerator<'a>) (cont:unit -> AsyncGenerator<'a>) : AsyncGenerator<'a> =
@@ -268,28 +257,14 @@ module AsyncGenerator =
       member __.Disposer = Some ((fun () -> (enum :> IDisposable).Dispose()))
 
   let enumeratorFromGenerator (g:AsyncGenerator<'a>) : IAsyncEnumerator<'a> =
-    #if !FABLE_COMPILER
     match g with
     | :? AsyncEnumeratorGenerator<'a> as g -> g.Enumerator
     | _ -> (new AsyncGeneratorEnumerator<_>(g) :> _)
-    #else
-    let g' = g :?> AsyncEnumeratorGenerator<'a>
-    match unbox<IAsyncEnumerator<_> option>(g'.Enumerator) with
-    | Some asyncEnumerator -> asyncEnumerator
-    | None -> (new AsyncGeneratorEnumerator<_>(g) :> _)
-    #endif
 
   let generatorFromEnumerator (e:IAsyncEnumerator<'a>) : AsyncGenerator<'a> =
-    #if !FABLE_COMPILER
     match e with
     | :? AsyncGeneratorEnumerator<'a> as e -> e.Generator
     | _ -> (new AsyncEnumeratorGenerator<_>(e) :> _)
-    #else
-    let e' = e :?> AsyncGeneratorEnumerator<'a>
-    match unbox<AsyncGenerator<_> option>(e'.Generator) with
-    | Some asyncGenerator -> asyncGenerator
-    | None -> (new AsyncEnumeratorGenerator<_>(e) :> _)
-    #endif
 
   let delay (f:unit -> AsyncSeq<'T>) : AsyncSeq<'T> =
     { new IAsyncEnumerable<'T> with
@@ -388,11 +363,7 @@ module AsyncSeqOp =
 
 /// Module with helper functions for working with asynchronous sequences
 module AsyncSeq =
-  #if FABLE_COMPILER
   let inline dispose (d:System.IDisposable) = try d.Dispose() with _ -> ()
-  #else
-  let private dispose (d:System.IDisposable) = match d with null -> () | _ -> d.Dispose()
-  #endif
 
   [<GeneralizableValue>]
   let empty<'T> : AsyncSeq<'T> =
@@ -728,17 +699,9 @@ module AsyncSeq =
       }
 
   let iterAsync (f: 'T -> Async<unit>) (source: AsyncSeq<'T>)  =
-    #if !FABLE_COMPILER
     match source with
     | :? AsyncSeqOp<'T> as source -> source.IterAsync f
     | _ -> iteriAsync (fun i x -> f x) source
-    #else
-    let source' = source :?> AsyncSeqOp<'T>
-    match (unbox<{| __proto__ : {| IterAsync: (('T -> Async<unit>) -> Async<unit>) option |} option |}>(source')).__proto__ with
-    | Some proto when proto.IterAsync.IsSome ->
-        source'.IterAsync f
-    | _ -> iteriAsync (fun _ x -> f x) source
-    #endif
 
   let iteri (f: int -> 'T -> unit) (inp: AsyncSeq<'T>)  = iteriAsync (fun i x -> async.Return (f i x)) inp
 
@@ -797,25 +760,13 @@ module AsyncSeq =
   // Additional combinators (implemented as async/asyncSeq computations)
 
   let mapAsync f (source : AsyncSeq<'T>) : AsyncSeq<'TResult> =
-    #if !FABLE_COMPILER
     match source with
     | :? AsyncSeqOp<'T> as source -> source.MapAsync f
     | _ ->
       asyncSeq {
         for itm in source do
         let! v = f itm
         yield v }
-    #else
-    let source' = source :?> AsyncSeqOp<'T>
-    match (unbox<{| __proto__ : {| MapAsync: (('T -> Async<_>) -> AsyncSeq<_>) option |} option |}>(source')).__proto__ with
-    | Some proto when proto.MapAsync.IsSome ->
-        proto.MapAsync.Value f
-    | _ ->
-      asyncSeq {
-        for itm in source do
-        let! v = f itm
-        yield v }
-    #endif
 
   let mapiAsync f (source : AsyncSeq<'T>) : AsyncSeq<'TResult> = asyncSeq {
     let i = ref 0L
@@ -840,7 +791,6 @@ module AsyncSeq =
   #endif
 
   let chooseAsync f (source:AsyncSeq<'T>) =
-    #if !FABLE_COMPILER
     match source with
     | :? AsyncSeqOp<'T> as source -> source.ChooseAsync f
     | _ ->
@@ -850,19 +800,6 @@ module AsyncSeq =
           match v with
           | Some v -> yield v
           | _ -> () }
-    #else
-    let source' = source :?> AsyncSeqOp<'T>
-    match (unbox<{| __proto__ : {| ChooseAsync: (('T -> Async<_ option>) -> AsyncSeq<_>) option |} option |}>(source')).__proto__ with
-    | Some proto when proto.ChooseAsync.IsSome ->
-      source'.ChooseAsync f
-    | _ ->
-      asyncSeq {
-        for itm in source do
-          let! v = f itm
-          match v with
-          | Some v -> yield v
-          | _ -> () }
-    #endif
 
   let ofSeqAsync (source:seq<Async<'T>>) : AsyncSeq<'T> =
       asyncSeq {
@@ -987,17 +924,9 @@ module AsyncSeq =
     source |> exists (f >> not) |> Async.map not
 
   let foldAsync f (state:'State) (source : AsyncSeq<'T>) =
-    #if !FABLE_COMPILER
     match source with
     | :? AsyncSeqOp<'T> as source -> source.FoldAsync f state
     | _ -> source |> scanAsync f state |> lastOrDefault state
-    #else
-    let source' = source :?> AsyncSeqOp<'T>
-    match (unbox<{| __proto__ : {| FoldAsync: (('State -> 'T -> Async<'State>) -> 'State -> Async<'State>) option |} option |}>(source')).__proto__ with
-    | Some proto when proto.FoldAsync.IsSome ->
-        proto.FoldAsync.Value f state
-    | _ -> source |> scanAsync f state |> lastOrDefault state
-    #endif
 
   let fold f (state:'State) (source : AsyncSeq<'T>) =
     foldAsync (fun st v -> f st v |> async.Return) state source

tests/fable/FSharp.Control.AsyncSeq.Tests/splitter.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+    presets: [
+      [
+        '@babel/preset-env',
+        {
+          targets: {
+            node: 'current',
+          },
+        },
+      ],
+    ],
+  };