demystifyfp · 1eyewonder · Nov 15, 2025 · Nov 15, 2025 · 1eyewonder · Nov 15, 2025
diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
@@ -3,14 +3,14 @@
   "isRoot": true,
   "tools": {
     "fable": {
-      "version": "4.25.0",
+      "version": "4.27.0",
       "commands": [
         "fable"
       ],
       "rollForward": false
     },
     "fantomas": {
-      "version": "7.0.2",
+      "version": "7.0.3",
       "commands": [
         "fantomas"
       ],
@@ -24,7 +24,7 @@
       "rollForward": false
     },
     "fsharp-analyzers": {
-      "version": "0.31.0",
+      "version": "0.34.1",
       "commands": [
         "fsharp-analyzers"
       ],

diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
@@ -19,12 +19,12 @@
         },
         // https://github.com/devcontainers/features/blob/main/src/github-cli/README.md
         "ghcr.io/devcontainers/features/github-cli:1": {},
-        // https://github.com/devcontainers-contrib/features/blob/main/src/starship/README.md
-        "ghcr.io/devcontainers-contrib/features/starship:1": {},
+        // https://github.com/devcontainers-extra/features/blob/main/src/starship/README.md
+        "ghcr.io/devcontainers-extra/features/starship:1": {},
         // https://github.com/devcontainers/features/blob/main/src/dotnet/README.md
         "ghcr.io/devcontainers/features/dotnet:2": {
-            "version": "9.0",
-            "additionalVersions": "8.0"
+            "version": "10.0",
+            "additionalVersions": ["8.0", "9.0"]
         },
         "ghcr.io/devcontainers/features/node:1": {
             "version": "22"

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -24,14 +24,15 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v5
     - name: Setup necessary dotnet SDKs
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v5
       with:
         global-json-file: global.json
         dotnet-version: |
           8.x
           9.x
+          10.x
 
     - name: Build via Bash
       if: runner.os != 'Windows'
@@ -58,20 +59,21 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v5
 
     - name: Setup Node.js
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v5
       with:
         node-version: ${{ matrix.node-version }}
 
     - name: Setup necessary dotnet SDKs
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v5
       with:
         global-json-file: global.json
         dotnet-version: |
           8.x
           9.x
+          10.x
 
     - name: Build via Bash
       if: runner.os != 'Windows'
@@ -105,12 +107,13 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Setup necessary dotnet SDKs
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v5
       with:
         global-json-file: global.json
         dotnet-version: |
           8.x
           9.x
+          10.x
     - name: Build via Bash
       if: runner.os != 'Windows'
       run: |
@@ -132,7 +135,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
 
       - name: Build and run dev container task
         uses: devcontainers/[email protected]
@@ -144,14 +147,15 @@ jobs:
   analyze:
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v5
         - name: Setup necessary dotnet SDKs
-          uses: actions/setup-dotnet@v3
+          uses: actions/setup-dotnet@v5
           with:
             global-json-file: global.json
             dotnet-version: |
               8.x
               9.x
+              10.x
         - name: Analyze
           run: |
             chmod +x ./build.sh

diff --git a/.vscode/launch.json b/.vscode/launch.json
@@ -5,14 +5,14 @@
             "name": "benchmarks",
             "type": "coreclr",
             "request": "launch",
-            "program": "${workspaceFolder}/benchmarks/bin/Release/net8.0/benchmarks.exe",
-            "args": ["-m", "--runtimes", "net8.0", "--filter", "*"],
+            "program": "${workspaceFolder}/benchmarks/bin/Release/net10.0/benchmarks.exe",
+            "args": ["-m", "--runtimes", "net10.0", "--filter", "*"],
             "env": {
                 "ASPNETCORE_ENVIRONMENT": "Development"
             },
             "console": "integratedTerminal",
             "preLaunchTask": "build release",
-            "cwd": "${workspaceFolder}/benchmarks/bin/Release/net8.0/"
+            "cwd": "${workspaceFolder}/benchmarks/bin/Release/net10.0/"
         }
     ]
 }
diff --git a/.vscode/settings.json b/.vscode/settings.json
@@ -10,8 +10,5 @@
         "BackgroundCompiler."
     ],
     "FSharp.fsac.parallelReferenceResolution": false,
-    "FSharp.enableAnalyzers": true,
-    "FSharp.analyzersPath": [
-        "packages/analyzers"
-    ]
+    "FSharp.enableAnalyzers": true
 }
diff --git a/Directory.Build.props b/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <DisableCheckingDuplicateNuGetItems>true</DisableCheckingDuplicateNuGetItems>
-    <NoWarn>$(NoWarn);FS2003;NU1903;NU1904;FS0057</NoWarn>
+    <NoWarn>$(NoWarn);FS2003;NU1902;NU1903;NU1904;FS0057</NoWarn>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
     <!-- 
@@ -11,8 +11,8 @@
       Then, we're assuming if you're building for net9.0 you're using F# 9 Language features.
       -->
     <LangVersion>8.0</LangVersion>
-    <LangVersion Condition="'$(TargetFramework)' == 'net9.0'">9.0</LangVersion>
-    <Nullable Condition="'$(TargetFramework)' == 'net9.0'">enable</Nullable>
+    <LangVersion Condition="'$(TargetFramework)' == 'net10.0'">10.0</LangVersion>
+    <Nullable Condition="'$(TargetFramework)' == 'net10.0'">enable</Nullable>
   </PropertyGroup>
 
 

diff --git a/Directory.Packages.props b/Directory.Packages.props
@@ -9,7 +9,7 @@
     <PackageVersion Include="Hopac" Version="0.5.1" />
     <PackageVersion Include="FSharp.Control.AsyncSeq" Version="3.2.1" />
     <PackageVersion Include="Fable.Core" Version="4.2.0" />
-    <PackageVersion Include="IcedTasks" Version="0.11.8" />
+    <PackageVersion Include="IcedTasks" Version="0.11.9" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
 
@@ -22,29 +22,29 @@
     <PackageVersion Include="Fable.Pyxpecto" Version="1.3.0" />
 
     <!-- Benchmarks group dependencies -->
-    <PackageVersion Include="BenchmarkDotNet" Version="0.15.0" />
-    <PackageVersion Include="BenchmarkDotNet.Annotations" Version="0.15.0" />
-    <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.0" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.6" />
+    <PackageVersion Include="BenchmarkDotNet.Annotations" Version="0.15.6" />
+    <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.6" />
 
     <!-- Build group dependencies -->
-    <PackageVersion Include="Fake.Core.Target" Version="5.22.0" />
-    <PackageVersion Include="Fake.DotNet.Cli" Version="5.22.0" />
-    <PackageVersion Include="Fake.Core.ReleaseNotes" Version="5.22.0" />
-    <PackageVersion Include="Fake.DotNet.AssemblyInfoFile" Version="5.22.0" />
-    <PackageVersion Include="Fake.DotNet.Testing.Expecto" Version="5.22.0" />
-    <PackageVersion Include="Fake.Tools.Git" Version="5.22.0" />
-    <PackageVersion Include="Fake.JavaScript.Npm" Version="5.22.0" />
-    <PackageVersion Include="Fake.Api.GitHub" Version="5.22.0" />
-    <PackageVersion Include="Fake.BuildServer.GitHubActions" Version="5.22.0" />
+    <PackageVersion Include="Fake.Core.Target" Version="6.1.4" />
+    <PackageVersion Include="Fake.DotNet.Cli" Version="6.1.4" />
+    <PackageVersion Include="Fake.Core.ReleaseNotes" Version="6.1.4" />
+    <PackageVersion Include="Fake.DotNet.AssemblyInfoFile" Version="6.1.4" />
+    <PackageVersion Include="Fake.DotNet.Testing.Expecto" Version="6.1.4" />
+    <PackageVersion Include="Fake.Tools.Git" Version="6.1.4" />
+    <PackageVersion Include="Fake.JavaScript.Npm" Version="6.1.4" />
+    <PackageVersion Include="Fake.Api.GitHub" Version="6.1.4" />
+    <PackageVersion Include="Fake.BuildServer.GitHubActions" Version="6.1.4" />
     <PackageVersion Include="MSBuild.StructuredLogger" Version="2.2.206" />
     <PackageVersion Include="Octokit" Version="0.53.0" />
     <PackageVersion Include="Nuget.Common" Version="6.6.1" />
     <PackageVersion Include="NuGet.Protocol" Version="6.6.1" />
     <PackageVersion Include="System.Security.Cryptography.Pkcs" Version="7.0.2" />
 
     <!-- Analyzers group dependencies -->
-    <PackageVersion Include="Ionide.Analyzers" Version="0.14.5" />
-    <PackageVersion Include="G-Research.FSharp.Analyzers" Version="0.15.0" />
+    <PackageVersion Include="Ionide.Analyzers" Version="0.14.10" />
+    <PackageVersion Include="G-Research.FSharp.Analyzers" Version="0.20.0" />
   </ItemGroup>
 
 

diff --git a/benchmarks/benchmarks.fsproj b/benchmarks/benchmarks.fsproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net10.0</TargetFrameworks>
     <OutputType>Exe</OutputType>
   </PropertyGroup>
   <PropertyGroup>

diff --git a/build/build.fsproj b/build/build.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <IsPackable>false</IsPackable>
     </PropertyGroup>
     <ItemGroup>

diff --git a/global.json b/global.json
@@ -1,6 +1,6 @@
 {
     "sdk": {
-        "version": "9.0.100",
+        "version": "10.0.100",
         "rollForward": "latestMinor"
     }
 }
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
@@ -30,9 +30,9 @@
     <PackageReference Condition="'$(TargetFramework)' == 'netstandard2.0'" Include="Microsoft.Bcl.AsyncInterfaces" />
   </ItemGroup>
   <Choose>
-    <When Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net9.0'))">
+    <When Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net10.0'))">
       <ItemGroup>
-      <PackageReference Include="FSharp.Core" VersionOverride="9.0.300" />
+      <PackageReference Include="FSharp.Core" VersionOverride="10.0.100" />
       </ItemGroup>
     </When>
     <Otherwise>
@@ -41,4 +41,10 @@
       </ItemGroup>
     </Otherwise>
   </Choose>
+
+  <ItemGroup>
+    <PackageReference Include="Ionide.Analyzers" PrivateAssets="All" />
+    <PackageReference Include="G-Research.FSharp.Analyzers" PrivateAssets="All" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/FsToolkit.ErrorHandling.AsyncSeq/FsToolkit.ErrorHandling.AsyncSeq.fsproj b/src/FsToolkit.ErrorHandling.AsyncSeq/FsToolkit.ErrorHandling.AsyncSeq.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFrameworks>netstandard2.1;netstandard2.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.1;netstandard2.0;net10.0</TargetFrameworks>
     <DebugType>portable</DebugType>
   </PropertyGroup>
   <!-- Add source files to "fable" folder in Nuget package -->

diff --git a/src/FsToolkit.ErrorHandling.IcedTasks/FsToolkit.ErrorHandling.IcedTasks.fsproj b/src/FsToolkit.ErrorHandling.IcedTasks/FsToolkit.ErrorHandling.IcedTasks.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Library</OutputType>
-        <TargetFrameworks>net6.0;netstandard2.0;netstandard2.1;net9.0</TargetFrameworks>
+        <TargetFrameworks>net6.0;netstandard2.0;netstandard2.1;net10.0</TargetFrameworks>
 
         <DebugType>portable</DebugType>
         <NoWarn>$(NoWarn);FS3511;FS3513</NoWarn>

diff --git a/src/FsToolkit.ErrorHandling.JobResult/FsToolkit.ErrorHandling.JobResult.fsproj b/src/FsToolkit.ErrorHandling.JobResult/FsToolkit.ErrorHandling.JobResult.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Library</OutputType>
-        <TargetFrameworks>netstandard2.1;netstandard2.0;net9.0</TargetFrameworks>
+        <TargetFrameworks>netstandard2.1;netstandard2.0;net10.0</TargetFrameworks>
         <DebugType>portable</DebugType>
     </PropertyGroup>
     <ItemGroup>

diff --git a/src/FsToolkit.ErrorHandling/FsToolkit.ErrorHandling.fsproj b/src/FsToolkit.ErrorHandling/FsToolkit.ErrorHandling.fsproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFrameworks>netstandard2.1;netstandard2.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.1;netstandard2.0;net10.0</TargetFrameworks>
     <DebugType>portable</DebugType>
     <NoWarn>$(NoWarn);FS1204;FS3511;FS3513;FS0057</NoWarn>
     <PackageTags>$(PackageTags), fable-library, fable-dotnet, fable-javascript, fable-python</PackageTags>

diff --git a/tests/Directory.Build.props b/tests/Directory.Build.props
@@ -15,9 +15,9 @@
     </ItemGroup>
 
       <Choose>
-    <When Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net9.0'))">
+    <When Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net10.0'))">
       <ItemGroup>
-      <PackageReference Include="FSharp.Core" VersionOverride="9.0.300" />
+      <PackageReference Include="FSharp.Core" VersionOverride="10.0.100" />
       </ItemGroup>
     </When>
     <Otherwise>

diff --git a/tests/FsToolkit.ErrorHandling.AsyncSeq.Tests/FsToolkit.ErrorHandling.AsyncSeq.Tests.fsproj b/tests/FsToolkit.ErrorHandling.AsyncSeq.Tests/FsToolkit.ErrorHandling.AsyncSeq.Tests.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
     </PropertyGroup>
     <ItemGroup>
         <ProjectReference Include="../../src/FsToolkit.ErrorHandling.AsyncSeq/FsToolkit.ErrorHandling.AsyncSeq.fsproj" />

diff --git a/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/CancellableTaskResultCE.fs b/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/CancellableTaskResultCE.fs
@@ -746,7 +746,7 @@ module CancellableTaskResultCE =
 
                     let! actual =
                         cancellableTaskResult {
-                            use d = null
+                            use d: IDisposableNull = null
                             return data
                         }
 

diff --git a/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/CancellableTaskValidationCE.fs b/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/CancellableTaskValidationCE.fs
@@ -833,7 +833,7 @@ module CancellableTaskValidationCE =
 
                     let! actual =
                         cancellableTaskValidation {
-                            use d = null
+                            use d: IDisposableNull = null
                             return data
                         }
 

diff --git a/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/FsToolkit.ErrorHandling.IcedTasks.Tests.fsproj b/tests/FsToolkit.ErrorHandling.IcedTasks.Tests/FsToolkit.ErrorHandling.IcedTasks.Tests.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
         <NoWarn>$(NoWarn); FS3511</NoWarn>
     </PropertyGroup>
     <ItemGroup>

diff --git a/tests/FsToolkit.ErrorHandling.JobResult.Tests/FsToolkit.ErrorHandling.JobResult.Tests.fsproj b/tests/FsToolkit.ErrorHandling.JobResult.Tests/FsToolkit.ErrorHandling.JobResult.Tests.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
     </PropertyGroup>
     <ItemGroup>
         <ProjectReference Include="../../src/FsToolkit.ErrorHandling.JobResult/FsToolkit.ErrorHandling.JobResult.fsproj" />

diff --git a/tests/FsToolkit.ErrorHandling.Tests/FsToolkit.ErrorHandling.Tests.fsproj b/tests/FsToolkit.ErrorHandling.Tests/FsToolkit.ErrorHandling.Tests.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFrameworks>net9.0;net8.0;</TargetFrameworks>
+        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
     </PropertyGroup>
     <ItemGroup>
         <ProjectReference Include="../../src/FsToolkit.ErrorHandling/FsToolkit.ErrorHandling.fsproj" />

diff --git a/tools/FunctionMap/FunctionMap.fsproj b/tools/FunctionMap/FunctionMap.fsproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <IsPackable>false</IsPackable>
         <IsTestProject>false</IsTestProject>
     </PropertyGroup>