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C# 14: Update documentation and claim C# 14 / .NET 10 support. #21871

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C# 14: Update documentation and claim C# 14 / .NET 10 support. #21871

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422a6bd
C#: Remove the prelim C# 14 footnote from the documentation.
michaelnebel May 20, 2026
462a7bc
C#: Add change-note.
michaelnebel May 20, 2026
e408540
Potential fix for pull request finding
michaelnebel May 20, 2026
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4 changes: 4 additions & 0 deletions csharp/ql/lib/change-notes/2026-05-20-csharp14-dotnet10.md
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---
category: minorAnalysis
---
* Full support for C# 14 / .NET 10. All new language features are now supported by the extractor. The QL library and data flow analysis now support the new C# 14 language constructs and include generated Models as Data (MaD) models for the .NET 10 runtime.
39 changes: 19 additions & 20 deletions docs/codeql/reusables/supported-versions-compilers.rst
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Expand Up @@ -11,23 +11,23 @@
Microsoft extensions (up to VS 2022),

Arm Compiler 5 [5]_","``.cpp``, ``.c++``, ``.cxx``, ``.hpp``, ``.hh``, ``.h++``, ``.hxx``, ``.c``, ``.cc``, ``.h``"
C#,C# up to 14 [6]_,"Microsoft Visual Studio up to 2019 with .NET up to 4.8,
C#,C# up to 14,"Microsoft Visual Studio up to 2019 with .NET up to 4.8,

.NET Core up to 3.1

.NET 5, .NET 6, .NET 7, .NET 8, .NET 9, .NET 10 [6]_","``.sln``, ``.slnx``, ``.csproj``, ``.cs``, ``.cshtml``, ``.xaml``"
.NET 5, .NET 6, .NET 7, .NET 8, .NET 9, .NET 10","``.sln``, ``.slnx``, ``.csproj``, ``.cs``, ``.cshtml``, ``.xaml``"
Comment on lines +14 to +18
GitHub Actions,"Not applicable",Not applicable,"``.github/workflows/*.yml``, ``.github/workflows/*.yaml``, ``**/action.yml``, ``**/action.yaml``"
Go (aka Golang), "Go up to 1.26", "Go 1.11 or more recent", ``.go``
Java,"Java 7 to 26 [7]_","javac (OpenJDK and Oracle JDK),
Java,"Java 7 to 26 [6]_","javac (OpenJDK and Oracle JDK),

Eclipse compiler for Java (ECJ) [8]_",``.java``
Eclipse compiler for Java (ECJ) [7]_",``.java``
Kotlin,"Kotlin 1.8.0 to 2.3.2\ *x*","kotlinc",``.kt``
JavaScript,ECMAScript 2022 or lower,Not applicable,"``.js``, ``.jsx``, ``.mjs``, ``.es``, ``.es6``, ``.htm``, ``.html``, ``.xhtm``, ``.xhtml``, ``.vue``, ``.hbs``, ``.ejs``, ``.njk``, ``.json``, ``.yaml``, ``.yml``, ``.raml``, ``.xml`` [9]_"
Python [10]_,"2.7, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13",Not applicable,``.py``
Ruby [11]_,"up to 3.3",Not applicable,"``.rb``, ``.erb``, ``.gemspec``, ``Gemfile``"
Rust [12]_,"Rust editions 2021 and 2024","Rust compiler","``.rs``, ``Cargo.toml``"
Swift [13]_ [14]_,"Swift 5.4-6.3","Swift compiler","``.swift``"
TypeScript [15]_,"2.6-5.9",Standard TypeScript compiler,"``.ts``, ``.tsx``, ``.mts``, ``.cts``"
JavaScript,ECMAScript 2022 or lower,Not applicable,"``.js``, ``.jsx``, ``.mjs``, ``.es``, ``.es6``, ``.htm``, ``.html``, ``.xhtm``, ``.xhtml``, ``.vue``, ``.hbs``, ``.ejs``, ``.njk``, ``.json``, ``.yaml``, ``.yml``, ``.raml``, ``.xml`` [8]_"
Python [9]_,"2.7, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13",Not applicable,``.py``
Ruby [10]_,"up to 3.3",Not applicable,"``.rb``, ``.erb``, ``.gemspec``, ``Gemfile``"
Rust [11]_,"Rust editions 2021 and 2024","Rust compiler","``.rs``, ``Cargo.toml``"
Swift [12]_ [13]_,"Swift 5.4-6.3","Swift compiler","``.swift``"
TypeScript [14]_,"2.6-5.9",Standard TypeScript compiler,"``.ts``, ``.tsx``, ``.mts``, ``.cts``"

.. container:: footnote-group

Expand All @@ -36,13 +36,12 @@
.. [3] Objective-C, Objective-C++, C++/CLI, and C++/CX are not supported.
.. [4] Support for the clang-cl compiler is preliminary.
.. [5] Support for the Arm Compiler (armcc) is preliminary.
.. [6] Support for .NET 10 is preliminary and code that uses language features new to C# 14 is not yet fully supported for extraction and analysis.
.. [7] Builds that execute on Java 7 to 26 can be analyzed. The analysis understands standard language features in Java 8 to 26; "preview" and "incubator" features are not supported. Source code using Java language versions older than Java 8 are analyzed as Java 8 code.
.. [8] ECJ is supported when the build invokes it via the Maven Compiler plugin or the Takari Lifecycle plugin.
.. [9] JSX and Flow code, YAML, JSON, HTML, and XML files may also be analyzed with JavaScript files.
.. [10] The extractor requires Python 3 to run. To analyze Python 2.7 you should install both versions of Python.
.. [11] Requires glibc 2.17.
.. [12] Requires ``rustup`` and ``cargo`` to be installed. Features from nightly toolchains are not supported.
.. [13] Support for the analysis of Swift requires macOS.
.. [14] Embedded Swift is not supported.
.. [15] TypeScript analysis is performed by running the JavaScript extractor with TypeScript enabled. This is the default.
.. [6] Builds that execute on Java 7 to 26 can be analyzed. The analysis understands standard language features in Java 8 to 26; "preview" and "incubator" features are not supported. Source code using Java language versions older than Java 8 are analyzed as Java 8 code.
.. [7] ECJ is supported when the build invokes it via the Maven Compiler plugin or the Takari Lifecycle plugin.
.. [8] JSX and Flow code, YAML, JSON, HTML, and XML files may also be analyzed with JavaScript files.
.. [9] The extractor requires Python 3 to run. To analyze Python 2.7 you should install both versions of Python.
.. [10] Requires glibc 2.17.
.. [11] Requires ``rustup`` and ``cargo`` to be installed. Features from nightly toolchains are not supported.
.. [12] Support for the analysis of Swift requires macOS.
.. [13] Embedded Swift is not supported.
.. [14] TypeScript analysis is performed by running the JavaScript extractor with TypeScript enabled. This is the default.
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