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Add --useJSPI to enable JSPI in the WebAssembly backend - #209
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Since Scala.js 1.22 the linker links js.async/js.await on WebAssembly only when WasmFeatures.useJSPI is set; otherwise linking fails with "Uses an async block without JSPI support in WebAssembly". scalajsld had no way to set it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
sideeffffect
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October 13, 2026 20:13
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…s --useJSPI The bundled scala-js-cli (1.22.0.1) rejects --useJSPI, so the end-to-end test can only pass once VirtusLab/scala-js-cli#209 is released and scalaJsCli is bumped. The option parsing and directive are covered by unit tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Gedochao
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Oct 16, 2026
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@Gedochao can you please make a new release with this? 🙏 |
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* Add --js-wasm-jspi and //> using wasmJspi to enable JSPI on Wasm Since Scala.js 1.22 the linker links js.async/js.await on WebAssembly only when WasmFeatures.useJSPI is set; otherwise linking fails with "Uses an async block without JSPI support in WebAssembly". The option is passed to the Scala.js CLI as --useJSPI, which needs a Scala.js CLI release containing VirtusLab/scala-js-cli#209. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Ignore the --js-wasm-jspi integration test until scala-js-cli supports --useJSPI The bundled scala-js-cli (1.22.0.1) rejects --useJSPI, so the end-to-end test can only pass once VirtusLab/scala-js-cli#209 is released and scalaJsCli is bumped. The option parsing and directive are covered by unit tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Enable the --js-wasm-jspi integration test Skip it on Scala 3.3, whose compiler has no js.async/js.await support. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Update modules/integration/src/test/scala/scala/cli/integration/RunScalaJsTestDefinitions.scala Co-authored-by: Piotr Chabelski <ged.subfan@gmail.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Piotr Chabelski <ged.subfan@gmail.com>
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Needed when playing with Scala Wasm via scala-cli.