[browser][coreCLR] implement JS interop#123131
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pavelsavara merged 6 commits intodotnet:mainfrom Jan 14, 2026
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- consume SystemInteropJS_* as LibraryImport for CoreCLR and keep Icall for Mono - JavaScriptExports as UnmanagedCallersOnly for CoreCLR and keep reflection for Mono - BindManagedFunction via reclection on C# side for CoreCLR, keep C API for Mono reflection - disable HTTP test until implemented dotnet#120216 - more _ems_ prefix for emscripten functions, EmsAmbientSymbolsType rename and move - register forceDisposeProxies into exit sequence - implement I53 memory operations - implement JS interop with camelCase names - pass JS interop unit tests
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area-System.Runtime.InteropServices.JavaScript
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Pull request overview
This PR implements JavaScript interop functionality for CoreCLR on the browser platform with camelCase naming conventions. It introduces significant infrastructure for marshaling data between JavaScript and C#, handling promises/tasks, managing object lifetimes, and providing bidirectional function calls.
Changes:
- Implements complete JS interop marshaling system with type-safe conversions between JS and C# types
- Adds CoreCLR-specific implementations separate from Mono using LibraryImport and UnmanagedCallersOnly
- Implements I53 (53-bit integer) memory operations for safe integer marshaling
- Establishes reverse PInvoke infrastructure for C++ to call managed JavaScript exports
Reviewed changes
Copilot reviewed 46 out of 48 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| src/native/rollup.config.plugins.js | Suppresses circular dependency warnings for marshal files |
| src/native/libs/System.Runtime.InteropServices.JavaScript.Native/native/index.ts | Implements SystemInteropJS_* exports for JS interop |
| src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/*.ts | Core marshaling, type definitions, and interop logic |
| src/native/libs/System.Native.Browser/utils/*.ts | Adds I53 operations and updates to use ems ambient symbols |
| src/native/libs/Common/JavaScript/types/*.ts | Type definitions for EmsAmbientSymbolsType and exchanges |
| src/libraries/System.Runtime.InteropServices.JavaScript/src/*.cs | Splits Mono/CoreCLR implementations |
| src/coreclr/vm/wasm/callhelpers-reverse.cpp | Adds reverse PInvoke thunks for JavaScriptExports |
| src/mono/sample/wasm/browser/* | Updates sample to test JSExport functionality |
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maraf
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Jan 14, 2026
...e.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSProxyContext.cs
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…stem/Runtime/InteropServices/JavaScript/JSProxyContext.cs Co-authored-by: Marek Fišera <[email protected]>
safeSetTimeout public stringToUTF8 fix JSExportByHandle
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Fixes #120703