Issue exporting Swift to JS using Examples/ExportSwift

[dwaite]

I've been able to get through the tutorial and modify the browser DOM through compiled WASM, but have not had luck exporting swift code to javascript.

I'm using mainline swift, a downloaded swift-idk for WebAssembly, and main JavaScriptKit (4504e1).

$ swiftly run swift --version
Apple Swift version 6.2-dev (LLVM dec20e11e68da63, Swift 8a77cba10b78e6f)
Target: arm64-apple-macosx26.0
Build config: +assertions

$ export SWIFT_SDK_ID=swift-DEVELOPMENT-SNAPSHOT-2025-08-02-a_wasm 
$ export JAVASCRIPTKIT_EXPERIMENTAL_BRIDGEJS=1  

$ cd JavaScriptKit
$ make bootstrap
$ cd Examples/ExportSwift
$ swiftly run swift package --swift-sdk $SWIFT_SDK_ID js

$ npx serve

But I get an error in the browser console:

TypeError: Module name, '@bjorn3/browser_wasi_shim' does not resolve to a valid URL.

If I modify the browser.js to reference this module in the node_modules directory, Chrome gives me the following error:

localhost/:1 Uncaught CompileError: WebAssembly.instantiateStreaming(): Duplicate export name 'swjs_library_features' for function 46 and function 817 @+2747

I'm not sure how to proceed at this point.

[kateinoigakukun]

Thanks for reporting :) You need to add --use-cdn to the js package plugin invocation.
I added a brief command instruction as well. https://github.com/swiftwasm/JavaScriptKit/tree/main/Examples/ExportSwift#building-and-running

If you want not to use CDN, you can bundle the dependency by using bundler tools like vite