browserhost

Emscripten application and JavaScript wrapper and a loader for it.

Loader dotnet.js

It loads application manifest and based on the manifest, it downloads other JS modules, managed assemblies and other assets. It plays role of a host and a public API for JavaScript user code. It's good to keep this file small, so that it could start the download cascade as soon as possible. It's JavaScript ES6 module

• loader/dotnet.ts compiled -> dotnet.js

Native host

Implements native part of the CoreCLR host and exposes it as an internal JavaScript interface to the loader. It is Emscripten application statically linked from libraries.

• libSystem.Native.Browser.js linked -> dotnet.native.js
• libSystem.Native.Browser.Utils.js linked -> dotnet.native.js
• libSystem.Runtime.InteropServices.JavaScript.Native.js linked -> dotnet.native.js
• libSystem.Native.Browser.a linked -> dotnet.native.wasm
• libSystem.Runtime.InteropServices.JavaScript.Native.a linked -> dotnet.native.wasm
• host/index.ts -> compiled -> libBrowserHost.js linked -> dotnet.native.js
• host/libBrowserHost.footer.js -> compiled -> libBrowserHost.js linked -> dotnet.native.js
• host/browserhost.cpp compiled -> libBrowserHost.a linked -> dotnet.native.wasm
• empty.c compiled + linked -> dotnet.native.wasm

Build

TypeScript is compiled by src/native/rollup.config.js JavaScript tools like npm, tsc, rollup are installed in src/native/package.json. JS tools depend on nodeJS installation of Emscripten. Emscripten compilations is part of src/native/corehost/CMakeLists.txt Final app static linking happens here in CMakeLists.txt