fix: Support libraries using TargetFrameworks property

tests/Main.fs

@@ -38,9 +38,17 @@ let ``Missing FablePackageType property should report an error`` () =
 
 [<Test>]
 let ``Missing FableTarget property should report an error`` () =
-    expectToFailWithMessage
-        Workspace.fixtures.invalid.``MissingFableTarget.fsproj``
-        "You need to set at least one of Fable target via the PackageTags property. Possible values are: fable-dart, fable-dotnet, fable-javascript, fable-python, fable-rust, fable-all."
+    task {
+        do!
+            expectToFailWithMessage
+                Workspace.fixtures.invalid.``MissingFableTarget.fsproj``
+                "You need to set at least one of Fable target via the PackageTags property. Possible values are: fable-dart, fable-dotnet, fable-javascript, fable-python, fable-rust, fable-all."
+
+        do!
+            expectToFailWithMessage
+                Workspace.fixtures.invalid.``MissingFableTargetMultiTFM.fsproj``
+                "You need to set at least one of Fable target via the PackageTags property. Possible values are: fable-dart, fable-dotnet, fable-javascript, fable-python, fable-rust, fable-all."
+    }
 
 [<Test>]
 let ``You cannot set both FablePackageType and FableTarget properties`` () =
@@ -237,20 +245,46 @@ let ``should include the source file and the project file under 'fable' folder``
             $"pack %s{Workspace.fixtures.valid.``library-with-files``.``MyLibrary.fsproj``}"
         )
 
-        let archive = ZipFile.OpenRead(VirtualWorkspace.fixtures.valid.``library-with-files``.bin.Release.``MyLibrary.1.0.0.nupkg``)
+        let archive =
+            ZipFile.OpenRead(
+                VirtualWorkspace.fixtures.valid.``library-with-files``.bin.Release.``MyLibrary.1.0.0.nupkg``
+            )
 
-        let entries =
-            archive.Entries
-            |> Seq.map (fun entry -> entry.FullName)
-            |> Seq.toList
+        let entries = archive.Entries |> Seq.map (fun entry -> entry.FullName) |> Seq.toList
 
-        Assert.That(
-            entries,
-            Contains.Item("fable/Entry.fs")
-        )
+        Assert.That(entries, Contains.Item("fable/Entry.fs"))
 
-        Assert.That(
-            entries,
-            Contains.Item("fable/MyLibrary.fsproj")
+        Assert.That(entries, Contains.Item("fable/MyLibrary.fsproj"))
+    }
+
+[<Test>]
+let ``should include the source file and the project file under 'fable' folder multi tfm`` () =
+    task {
+        // Make sure we work with a fresh nupkg file
+        let fileInfo =
+            VirtualWorkspace.fixtures.valid.``library-with-files``.bin.Release.``MyLibraryMultiTFM.1.0.0.nupkg``
+            |> FileInfo
+
+        if fileInfo.Exists then
+            fileInfo.Delete()
+
+        Command.Run(
+            "dotnet",
+            $"pack %s{Workspace.fixtures.valid.``library-with-files``.``MyLibraryMultiTFM.fsproj``}"
         )
+
+        let archive =
+            ZipFile.OpenRead(
+                VirtualWorkspace.fixtures.valid.``library-with-files``.bin.Release.``MyLibraryMultiTFM.1.0.0.nupkg``
+            )
+
+        let entries = archive.Entries |> Seq.map (fun entry -> entry.FullName) |> Seq.toList
+
+        Assert.That(entries, Contains.Item("fable/Entry.fs"))
+
+        Assert.That(entries, Contains.Item("fable/MyLibraryMultiTFM.fsproj"))
+
+        Assert.That(entries, Contains.Item("lib/netstandard2.0/MyLibraryMultiTFM.dll"))
+
+        Assert.That(entries, Contains.Item("lib/net8.0/MyLibraryMultiTFM.dll"))
     }

tests/Workspace.fs

@@ -13,4 +13,5 @@ fixtures/
             bin/
                 Release/
                     MyLibrary.1.0.0.nupkg
+                    MyLibraryMultiTFM.1.0.0.nupkg
 """>

tests/fixtures/invalid/MissingFableTargetMultiTFM.fsproj

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFrameworks>netstandard2.0;net8.0</TargetFrameworks>
+        <FablePackageType>binding</FablePackageType>
+    </PropertyGroup>
+    <Import Project="./../Fable.Package.SDK.Imports.props" />
+</Project>

tests/fixtures/valid/library-with-files/MyLibraryMultiTFM.fsproj

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFrameworks>netstandard2.0;net8.0</TargetFrameworks>
+        <FablePackageType>library</FablePackageType>
+        <PackageTags>fable-javascript</PackageTags>
+    </PropertyGroup>
+    <ItemGroup>
+        <Compile Include="Entry.fs" />
+    </ItemGroup>
+    <Import Project="./../../Fable.Package.SDK.Imports.props" />
+</Project>

tests/fixtures/valid/library-with-files/packages.lock.json

@@ -22,6 +22,14 @@
         "resolved": "1.1.0",
         "contentHash": "kz0PEW2lhqygehI/d6XsPCQzD7ff7gUJaVGPVETX611eadGsA3A877GdSlU0LRVMCTH/+P3o2iDTak+S08V2+A=="
       }
+    },
+    "net8.0": {
+      "FSharp.Core": {
+        "type": "Direct",
+        "requested": "[8.0.101, )",
+        "resolved": "8.0.101",
+        "contentHash": "sOLz3O4BOxnTKfd5OChdRmDUy4Id0GfoEClRG4nzIod8LY1LJZcNyygKAV0A78XOLh8yvhA5hsDYKZXGCR9blw=="
+      }
     }
   }
 }