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Add a Kotlin/JS target alongside Wasm - #59
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The library and the sample built for wasmJs only, so anyone targeting Kotlin/JS could not depend on KScan at all. Both now build from one shared webMain source set, which the default hierarchy template already provides for the js + wasmJs group. The JS backend rejects async/await inside js(), so the browser interop is now written as promise chains: enumerateCameras, detectFromVideoFrame, imageBitmapFromBase64, startCamera, applyTorch and applyZoom. startCamera's nested try/catch fallback became .catch() links with a reportFailure helper that reports how many video inputs the browser can see. Control flow and error messages are unchanged. enumerateCameras builds its result with a function expression rather than an arrow. The js() printer drops the parentheses around an arrow's object literal body, and collapses an explicit return back into that same body, so either arrow form emits a block where an expression belongs and webpack fails to parse it. CI builds both distributions, and the ABI dump records the web declarations as js and wasmJs.
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The library and the sample built for wasmJs only, so anyone targeting Kotlin/JS could not depend on KScan at all. Both now build from one shared webMain source set