June 2026 (dotnet/runtime): Focused on reliability improvements in tests and interoperability across browser/wasm and CoreCLR, with targeted build/publish optimizations to ensure reverse thunks are present in the published wasm and cross-runtime interop works end-to-end. Delivered features to enable UnmanagedCallersOnly on Wasm, improved test coverage, and hardened the publishing pipeline for trimmed Release builds.

May 2026 monthly summary for dotnet/runtime and filipnavara/runtime highlighting key features, bugs fixed, impact, and technologies demonstrated. Focus on delivering business value and technical achievements with specifics on what was delivered across the two repositories.

April 2026 performance summary for dotnet/runtime: Deliveries centered on Webcil V1 support for CoreCLR WebAssembly, strengthened test infrastructure for browser/wasm and CoreCLR, and targeted fixes for WASM-related build issues. These efforts improved cross-runtime WebAssembly compatibility, accelerated feedback loops in CI, and increased release confidence across platforms.

Month 2026-03 was focused on enabling and stabilizing WebAssembly workloads in CoreCLR, expanding test coverage across browsers, and strengthening CI reliability for WASM workflows. Delivered end-to-end WebAssembly testing framework and browser runtime integration, improved interpreter/runtime correctness for WASM targets, and implemented CI/Testing improvements to reduce flaky failures. Fixed startup and edge-case issues (preRun TPA population, zero-target CEE_SWITCH) and gated flaky tests to stabilize the suite. Also advanced portable entry point support by deferring calli cookie resolution to runtime execution and refined related interpreter paths.

February 2026: Delivered stability and capacity improvements across dotnet/runtime and filipnavara/runtime, focusing on WebAssembly support, test coverage, and cross-platform testing. Key accomplishments include a bug fix for reflection with large valuetypes, extensive WASM CI/test and memory capacity enhancements, and provisioning improvements for macOS ARM64. Also fixed prestub handling for WASM IL helper stubs to restore runtime stability.

January 2026: Focused on WebAssembly runtime improvements, browser-build reliability, and load-time efficiency for dotnet/runtime. Implemented interop enhancements, memory allocation robustness, and accurate struct/layout alignment, while simplifying native image loading and reducing browser build warnings. This work improved cross-platform stability, performance, and developer experience in WASM and browser contexts.

December 2025 (dotnet/runtime) delivered four high-impact items that strengthened runtime reliability, cross-language interoperability, and resource handling across platforms, with a focus on wasm and dynamic method scenarios. Key outcomes include stabilizing the interpreter for virtual generic calls, enabling flexible cross-language calls via UnmanagedCallersOnly-based reverse thunks, refining runtime method reset to ignore obsolete rental methods, and ensuring deterministic resource lookups by sorting native string resource arrays. Together, these changes reduce runtime crashes, improve interoperability, and enhance performance in critical execution paths.

November 2025 (dotnet/runtime) delivered major WebAssembly (WASM) interop and runtime reliability improvements focused on managed-native interop, stack handling, and cross-runtime stability. The team completed early work on porting the WASM call generator to CoreCLR, and implemented critical bug fixes to ensure correct argument handling, transition safety, and Node.js exit codes. These changes reduce runtime error surfaces, improve performance of WASM interactions, and establish a foundation for automated call-helper generation.

October 2025 monthly summary: Focused on WebAssembly runtime improvements in dotnet/runtime, delivering correctness, performance, and reliability gains; enabled memory growth for large-memory scenarios; expanded test coverage; implemented critical bug fixes; and advanced code organization and collaboration across wasm/coreclr workstreams.

September 2025 monthly summary for dotnet/runtime focusing on WebAssembly runtime integration and portability enhancements. Delivered cross-plat wasm interoperability improvements including interpreter opcodes, HelloWorld execution, exception handling, portable entry points, and portable allocator support. Strengthened wasm hosting readiness and performance, enabling broader workload scenarios and smoother future migrations across runtimes.

August 2025 (2025-08) focused on stabilizing the WebAssembly benchmarking workflow and unifying cross‑platform memory barrier handling in dotnet/runtime. Delivered reliability improvements, standardized internal APIs, and documentation updates to support long‑term maintainability and cross‑platform consistency. Key activities included patch reliability improvements for WebAssembly benchmark startup templates and refactoring memory barrier logic into minipal.

July 2025 monthly summary for dotnet/runtime: focused on strengthening WebAssembly runtime initialization on CoreCLR. Delivered a dedicated WASM host executable, enabled the interpreter for WASM builds, and resolved platform-specific startup issues to improve reliability and cross-platform startup performance. These changes reduce startup latency, broaden platform support, and improve developer experience for WebAssembly workloads in production.

May 2025: WebAssembly runtime enhancements and build reliability improvements in filipnavara/runtime. Key work included 64-bit field alignment improvements for wasm, interpreter-first mode with static linking for wasm targets, and Windows build support for the wasm CoreCLR runtime to broaden deployment scenarios. A CMake build configuration bug fix corrected an incorrect endif condition in configureplatform.cmake to ensure proper closure of the emscripten/browser conditional block, preventing build issues.

April 2025 highlights: Expanded WebAssembly support in filipnavara/runtime by enabling Wasm as a CoreCLR target, refining subset libraries, and stabilizing browser builds with Mono as the primary runtime flavor. Also fixed a critical Wasm bench template path issue to ensure correct benchmark sample generation. These changes reduce build times, improve cross-platform reliability, and enable faster iteration on Wasm workloads.

March 2025 – FilipNavara/runtime: Delivered foundational WebAssembly (WASM) runtime support with added build configurations and test runner adaptations for PAL tests, enabling initial coreclr.runtime WASM builds. This work establishes cross-target portability, accelerates WASM validation, and sets the stage for potential browser/edge deployments and further optimization.

February 2025 — filipnavara/runtime: Implemented ChromeDriver integration for simple-server, enabling browser automation and automated testing workflows. Added support for controlling a Chrome browser via ChromeDriver, options for opening URLs, and detection of specific ChromeDriver output lines to trigger server exit, enabling end-to-end testing scenarios. This lays groundwork for automated UI validation and CI reliability.

January 2025 monthly summary: Focused hardening of SkiaSharp WebAssembly (WASM) testing within the Satori repository. Implemented package-version updates and build configuration tweaks to stabilize the WebAssembly Build Tests (WBT), and resolved a problematic Debug/AOT combination that previously caused build failures. Restored and stabilized SkiaSharp testing in WebAssembly, improving CI reliability and test coverage for WASM deployments.

December 2024 monthly summary for filipnavara/runtime: Focused on delivering measurable business value through WebAssembly benchmarking enhancements and reliability fixes. Key improvements include enhanced logging for benchmark outputs, and build/template stability to ensure accurate startup measurements across Blazor wasm workloads.

Month 2024-11 performance summary for filipnavara/runtime focusing on stabilizing WebAssembly Blazor tests for SkiaSharp and resolving Build/AOT-related issues. Implemented dependency and build configuration adjustments to fix Debug/AOT failures and native library ordering, directly enabling WebAssembly Blazor tests for SkiaSharp again.

Month: 2024-10 — Key work across filipnavara/runtime focused on stabilizing ARM64 unwind behavior and delivering cross-platform consistency. Delivered unconditional unwind table kind Sync for all ARM64 targets, unifying unwind handling and removing the previous macOS-only constraint. This work is captured in commit [mono] Use sync unwind tables on all arm64 targets (#109406).