Separate Result from Choice

src/Fable.Transforms/Dart/Replacements.fs

@@ -42,7 +42,7 @@ let coreModFor =
     | BclTimeSpan -> "TimeSpan"
     | FSharpSet _ -> "Set"
     | FSharpMap _ -> "Map"
-    | FSharpResult _ -> "Choice"
+    | FSharpResult _ -> "Result"
     | FSharpChoice _ -> "Choice"
     | FSharpReference _ -> "Types"
     | BclHashSet _ -> "MutableSet"
@@ -768,7 +768,7 @@ let tryReplacedEntityRef (com: Compiler) entFullName =
     | BuiltinDefinition BclTimeSpan -> makeIdentExpr "Duration" |> Some
     | BuiltinDefinition BclTimer -> makeImportLib com MetaType "default" "Timer" |> Some
     | BuiltinDefinition(FSharpReference _) -> makeImportLib com MetaType "FSharpRef" "Types" |> Some
-    | BuiltinDefinition(FSharpResult _) -> makeImportLib com MetaType "FSharpResult$2" "Choice" |> Some
+    | BuiltinDefinition(FSharpResult _) -> makeImportLib com MetaType "FSharpResult$2" "Result" |> Some
     | BuiltinDefinition(FSharpChoice genArgs) ->
         let membName = $"FSharpChoice${List.length genArgs}"
         makeImportLib com MetaType membName "Choice" |> Some
@@ -2365,7 +2365,7 @@ let results (com: ICompiler) (ctx: Context) r (t: Type) (i: CallInfo) (_: Expr o
     | "ToValueOption" as meth -> Some("Result_" + meth)
     | _ -> None
     |> Option.map (fun meth ->
-        Helper.LibCall(com, "Choice", meth, t, args, i.SignatureArgTypes, genArgs = i.GenericArgs, ?loc = r)
+        Helper.LibCall(com, "Result", meth, t, args, i.SignatureArgTypes, genArgs = i.GenericArgs, ?loc = r)
     )
 
 let nullables (com: ICompiler) (_: Context) r (t: Type) (i: CallInfo) (thisArg: Expr option) (args: Expr list) =

src/Fable.Transforms/Fable2Babel.fs

@@ -800,7 +800,7 @@ module Annotation =
                     ok
                     err
                 ]
-                "Choice"
+                "Result"
         | Replacements.Util.FSharpChoice genArgs ->
             $"FSharpChoice${List.length genArgs}{Util.UnionHelpers.UNION_SUFFIX}"
             |> makeFableLibImportTypeAnnotation com ctx genArgs "Choice"

src/Fable.Transforms/Python/Fable2Python.fs

@@ -914,7 +914,7 @@ module Annotation =
         | Types.result, _ ->
             let resolved, stmts = resolveGenerics com ctx genArgs repeatedGenerics
 
-            fableModuleAnnotation com ctx "choice" "FSharpResult_2" resolved, stmts
+            fableModuleAnnotation com ctx "result" "FSharpResult_2" resolved, stmts
         | Replacements.Util.BuiltinEntity _kind -> stdlibModuleTypeHint com ctx "typing" "Any" []
         (*
             | Replacements.Util.BclGuid
@@ -1080,7 +1080,7 @@ module Annotation =
                     ]
                     repeatedGenerics
 
-            fableModuleAnnotation com ctx "choice" "FSharpResult_2" resolved, stmts
+            fableModuleAnnotation com ctx "result" "FSharpResult_2" resolved, stmts
         | _ -> stdlibModuleTypeHint com ctx "typing" "Any" []
 
     let transformFunctionWithAnnotations (com: IPythonCompiler) ctx name (args: Fable.Ident list) (body: Fable.Expr) =

src/Fable.Transforms/Python/Replacements.fs

@@ -56,7 +56,7 @@ let coreModFor =
     | BclTimeSpan -> "time_span"
     | FSharpSet _ -> "set"
     | FSharpMap _ -> "map"
-    | FSharpResult _ -> "choice"
+    | FSharpResult _ -> "result"
     | FSharpChoice _ -> "choice"
     | FSharpReference _ -> "types"
     | BclHashSet _ -> "mutable_set"
@@ -1166,7 +1166,7 @@ let tryEntityIdent (com: Compiler) entFullName =
     | BuiltinDefinition BclDateTimeOffset -> makeIdentExpr "Date" |> Some
     | BuiltinDefinition BclTimer -> makeImportLib com Any "default" "Timer" |> Some
     | BuiltinDefinition(FSharpReference _) -> makeImportLib com Any "FSharpRef" "Types" |> Some
-    | BuiltinDefinition(FSharpResult _) -> makeImportLib com Any "FSharpResult_2" "Choice" |> Some
+    | BuiltinDefinition(FSharpResult _) -> makeImportLib com Any "FSharpResult_2" "Result" |> Some
     | BuiltinDefinition(FSharpChoice genArgs) ->
         let membName = $"FSharpChoice_{List.length genArgs}"
         makeImportLib com Any membName "Choice" |> Some
@@ -2608,7 +2608,7 @@ let results (com: ICompiler) (ctx: Context) r (t: Type) (i: CallInfo) (_: Expr o
     | "ToOption"
     | "ToValueOption" as meth -> Some("Result_" + meth)
     | _ -> None
-    |> Option.map (fun meth -> Helper.LibCall(com, "choice", meth, t, args, i.SignatureArgTypes, ?loc = r))
+    |> Option.map (fun meth -> Helper.LibCall(com, "result", meth, t, args, i.SignatureArgTypes, ?loc = r))
 
 let nullables (com: ICompiler) (_: Context) r (t: Type) (i: CallInfo) (thisArg: Expr option) (args: Expr list) =
     match i.CompiledName, thisArg with

src/Fable.Transforms/Replacements.Util.fs

@@ -309,8 +309,8 @@ type BuiltinType =
     | BclKeyValuePair of key: Type * value: Type
     | FSharpSet of Type
     | FSharpMap of key: Type * value: Type
-    | FSharpChoice of Type list
-    | FSharpResult of arg1: Type * arg2: Type
+    | FSharpChoice of genArgs: Type list
+    | FSharpResult of ok: Type * err: Type
     | FSharpReference of Type
 
 let (|BuiltinDefinition|_|) =

src/Fable.Transforms/Replacements.fs

@@ -84,7 +84,7 @@ let coreModFor =
     | BclTimeSpan -> "TimeSpan"
     | FSharpSet _ -> "Set"
     | FSharpMap _ -> "Map"
-    | FSharpResult _ -> "Choice"
+    | FSharpResult _ -> "Result"
     | FSharpChoice _ -> "Choice"
     | FSharpReference _ -> "Types"
     | BclHashSet _ -> "MutableSet"
@@ -1127,7 +1127,7 @@ let tryEntityIdent (com: Compiler) entFullName =
     | BuiltinDefinition BclDateTimeOffset -> makeIdentExpr "Date" |> Some
     | BuiltinDefinition BclTimer -> makeImportLib com Any "default" "Timer" |> Some
     | BuiltinDefinition(FSharpReference _) -> makeImportLib com Any "FSharpRef" "Types" |> Some
-    | BuiltinDefinition(FSharpResult _) -> makeImportLib com Any "FSharpResult$2" "Choice" |> Some
+    | BuiltinDefinition(FSharpResult _) -> makeImportLib com Any "FSharpResult$2" "Result" |> Some
     | BuiltinDefinition(FSharpChoice genArgs) ->
         let membName = $"FSharpChoice${List.length genArgs}"
         makeImportLib com Any membName "Choice" |> Some
@@ -2733,7 +2733,7 @@ let results (com: ICompiler) (ctx: Context) r (t: Type) (i: CallInfo) (_: Expr o
     | "ToValueOption" as meth -> Some("Result_" + meth)
     | _ -> None
     |> Option.map (fun meth ->
-        Helper.LibCall(com, "Choice", meth, t, args, i.SignatureArgTypes, genArgs = i.GenericArgs, ?loc = r)
+        Helper.LibCall(com, "Result", meth, t, args, i.SignatureArgTypes, genArgs = i.GenericArgs, ?loc = r)
     )
 
 let nullables (com: ICompiler) (_: Context) r (t: Type) (i: CallInfo) (thisArg: Expr option) (args: Expr list) =

src/fable-library-dart/Choice.fs

@@ -1,119 +1,5 @@
 namespace FSharp.Core
 
-[<CompiledName("FSharpResult`2")>]
-type Result<'T, 'TError> =
-    | Ok of ResultValue: 'T
-    | Error of ErrorValue: 'TError
-
-module Result =
-    [<CompiledName("Map")>]
-    let map mapping result =
-        match result with
-        | Error e -> Error e
-        | Ok x -> Ok(mapping x)
-
-    [<CompiledName("MapError")>]
-    let mapError mapping result =
-        match result with
-        | Error e -> Error(mapping e)
-        | Ok x -> Ok x
-
-    [<CompiledName("Bind")>]
-    let bind binder result =
-        match result with
-        | Error e -> Error e
-        | Ok x -> binder x
-
-    [<CompiledName("IsOk")>]
-    let isOk (result: Result<'a, 'b>) : bool =
-        match result with
-        | Error _ -> false
-        | Ok _ -> true
-
-    [<CompiledName("IsError")>]
-    let isError (result: Result<'a, 'b>) : bool =
-        match result with
-        | Error _ -> true
-        | Ok _ -> false
-
-    [<CompiledName("Contains")>]
-    let contains (value: 'a) (result: Result<'a, 'b>) : bool =
-        match result with
-        | Error _ -> false
-        | Ok x -> x = value
-
-    [<CompiledName("Count")>]
-    let count (result: Result<'a, 'b>) : int =
-        match result with
-        | Error _ -> 0
-        | Ok _ -> 1
-
-    [<CompiledName("DefaultValue")>]
-    let defaultValue (defaultValue: 'a) (result: Result<'a, 'b>) : 'a =
-        match result with
-        | Error _ -> defaultValue
-        | Ok x -> x
-
-    [<CompiledName("DefaultWith")>]
-    let defaultWith (defThunk: 'b -> 'a) (result: Result<'a, 'b>) : 'a =
-        match result with
-        | Error e -> defThunk e
-        | Ok x -> x
-
-    [<CompiledName("Exists")>]
-    let exists (predicate: 'a -> bool) (result: Result<'a, 'b>) : bool =
-        match result with
-        | Error _ -> false
-        | Ok x -> predicate x
-
-    [<CompiledName("Fold")>]
-    let fold<'a, 'b, 's> (folder: 's -> 'a -> 's) (state: 's) (result: Result<'a, 'b>) : 's =
-        match result with
-        | Error _ -> state
-        | Ok x -> folder state x
-
-    [<CompiledName("FoldBack")>]
-    let foldBack<'a, 'b, 's> (folder: 'a -> 's -> 's) (result: Result<'a, 'b>) (state: 's) : 's =
-        match result with
-        | Error _ -> state
-        | Ok x -> folder x state
-
-    [<CompiledName("ForAll")>]
-    let forall (predicate: 'a -> bool) (result: Result<'a, 'b>) : bool =
-        match result with
-        | Error _ -> true
-        | Ok x -> predicate x
-
-    [<CompiledName("Iterate")>]
-    let iterate (action: 'a -> unit) (result: Result<'a, 'b>) : unit =
-        match result with
-        | Error _ -> ()
-        | Ok x -> action x
-
-    [<CompiledName("ToArray")>]
-    let toArray (result: Result<'a, 'b>) : 'a[] =
-        match result with
-        | Error _ -> [||]
-        | Ok x -> [| x |]
-
-    [<CompiledName("ToList")>]
-    let toList (result: Result<'a, 'b>) : 'a list =
-        match result with
-        | Error _ -> []
-        | Ok x -> [ x ]
-
-    [<CompiledName("ToOption")>]
-    let toOption (result: Result<'a, 'b>) : Option<'a> =
-        match result with
-        | Error _ -> None
-        | Ok x -> Some x
-
-    [<CompiledName("ToValueOption")>]
-    let toValueOption (result: Result<'a, 'b>) : ValueOption<'a> =
-        match result with
-        | Error _ -> ValueNone
-        | Ok x -> ValueSome x
-
 [<CompiledName("FSharpChoice`2")>]
 type Choice<'T1, 'T2> =
     | Choice1Of2 of 'T1

src/fable-library-dart/Fable.Library.Dart.fsproj

@@ -10,6 +10,7 @@
         <Compile Include="Global.fs" />
         <Compile Include="FSharp.Core.fs" />
         <Compile Include="Option.fs" />
+        <Compile Include="Result.fs" />
         <Compile Include="Choice.fs" />
         <Compile Include="Seq.fs" />
         <Compile Include="Seq2.fs" />

src/fable-library-dart/Result.fs

@@ -0,0 +1,115 @@
+namespace FSharp.Core
+
+[<CompiledName("FSharpResult`2")>]
+type Result<'T, 'TError> =
+    | Ok of ResultValue: 'T
+    | Error of ErrorValue: 'TError
+
+module Result =
+    [<CompiledName("Map")>]
+    let map mapping result =
+        match result with
+        | Error e -> Error e
+        | Ok x -> Ok(mapping x)
+
+    [<CompiledName("MapError")>]
+    let mapError mapping result =
+        match result with
+        | Error e -> Error(mapping e)
+        | Ok x -> Ok x
+
+    [<CompiledName("Bind")>]
+    let bind binder result =
+        match result with
+        | Error e -> Error e
+        | Ok x -> binder x
+
+    [<CompiledName("IsOk")>]
+    let isOk (result: Result<'a, 'b>) : bool =
+        match result with
+        | Error _ -> false
+        | Ok _ -> true
+
+    [<CompiledName("IsError")>]
+    let isError (result: Result<'a, 'b>) : bool =
+        match result with
+        | Error _ -> true
+        | Ok _ -> false
+
+    [<CompiledName("Contains")>]
+    let contains (value: 'a) (result: Result<'a, 'b>) : bool =
+        match result with
+        | Error _ -> false
+        | Ok x -> x = value
+
+    [<CompiledName("Count")>]
+    let count (result: Result<'a, 'b>) : int =
+        match result with
+        | Error _ -> 0
+        | Ok _ -> 1
+
+    [<CompiledName("DefaultValue")>]
+    let defaultValue (defaultValue: 'a) (result: Result<'a, 'b>) : 'a =
+        match result with
+        | Error _ -> defaultValue
+        | Ok x -> x
+
+    [<CompiledName("DefaultWith")>]
+    let defaultWith (defThunk: 'b -> 'a) (result: Result<'a, 'b>) : 'a =
+        match result with
+        | Error e -> defThunk e
+        | Ok x -> x
+
+    [<CompiledName("Exists")>]
+    let exists (predicate: 'a -> bool) (result: Result<'a, 'b>) : bool =
+        match result with
+        | Error _ -> false
+        | Ok x -> predicate x
+
+    [<CompiledName("Fold")>]
+    let fold<'a, 'b, 's> (folder: 's -> 'a -> 's) (state: 's) (result: Result<'a, 'b>) : 's =
+        match result with
+        | Error _ -> state
+        | Ok x -> folder state x
+
+    [<CompiledName("FoldBack")>]
+    let foldBack<'a, 'b, 's> (folder: 'a -> 's -> 's) (result: Result<'a, 'b>) (state: 's) : 's =
+        match result with
+        | Error _ -> state
+        | Ok x -> folder x state
+
+    [<CompiledName("ForAll")>]
+    let forall (predicate: 'a -> bool) (result: Result<'a, 'b>) : bool =
+        match result with
+        | Error _ -> true
+        | Ok x -> predicate x
+
+    [<CompiledName("Iterate")>]
+    let iterate (action: 'a -> unit) (result: Result<'a, 'b>) : unit =
+        match result with
+        | Error _ -> ()
+        | Ok x -> action x
+
+    [<CompiledName("ToArray")>]
+    let toArray (result: Result<'a, 'b>) : 'a[] =
+        match result with
+        | Error _ -> [||]
+        | Ok x -> [| x |]
+
+    [<CompiledName("ToList")>]
+    let toList (result: Result<'a, 'b>) : 'a list =
+        match result with
+        | Error _ -> []
+        | Ok x -> [ x ]
+
+    [<CompiledName("ToOption")>]
+    let toOption (result: Result<'a, 'b>) : Option<'a> =
+        match result with
+        | Error _ -> None
+        | Ok x -> Some x
+
+    [<CompiledName("ToValueOption")>]
+    let toValueOption (result: Result<'a, 'b>) : ValueOption<'a> =
+        match result with
+        | Error _ -> ValueNone
+        | Ok x -> ValueSome x

src/fable-library-py/fable_library/Fable.Library.fsproj

@@ -18,6 +18,7 @@
     <Compile Include="Native.fs" />
     <Compile Include="../../fable-library/MutableMap.fs" Link="MutableMap.fs" />
     <Compile Include="../../fable-library/MutableSet.fs" Link="MutableSet.fs" />
+    <Compile Include="../../fable-library/Result.fs" Link="Result.fs" />
     <Compile Include="../../fable-library/Choice.fs" Link="Choice.fs" />
     <Compile Include="Array.fs" />
     <Compile Include="List.fs" />