JSC.js

JavaScriptCore on WebAssembly

View on GitHub

JSC.js is a JavaScript engine that can run on top of your browser’s JavaScript engine. It’s based on the JavaScript engine (JavaScriptCore) of WebKit and compiled to wasm with emscripten. Therefore, if you’re using Safari, you are running its JavaScript engine on top of itself.

The size of JSC.wasm is around 4MB (compressed js and mem file).

ScreenShot

Build

Preparation

Build with gn

> gn gen out --args="target_os=\"wasm\""
> ninja -C out

Build test shell on Windows

Usually, you don’t need this but with the test shell, you can easily debug and test JSC.js on windows when there’s no good debugger for JSC.js on wasm.

Preparation

Build with gn

> gn gen out --args="target_os=\"win\""
> ninja -C out