Scala.js 1.19.0 has been released with notable improvements, particularly enhancing the WebAssembly backend for better performance. The latest versions of Firefox and Safari support all necessary WebAssembly features for Scala.js, while Chrome needs a flag for exception handling. This release also includes native support for JavaScript async/await, small code size improvements for JavaScript, and support for Promise Integration. Additionally, while this version is backward binary compatible with 1.x versions, precautions are noted for those upgrading from 1.18.x.
This release comes with significant performance improvements to the WebAssembly backend. For codebases where performance is dominated by computations, the Wasm output is now expected to be faster than the JS output.
As of this writing, the latest versions of Firefox and Safari support all necessary WebAssembly features to run Scala.js-on-Wasm, while Chrome requires a flag for exception handling.
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