wasm-bindgen Files

Added

• Added the WebGL extension interface EXT_polygon_offset_clamp. #5336

• Added the texture-compression-unaligned variant to GpuFeatureName, matching the WebGPU specification. #5335

• Added an Emscripten Target page to the guide covering the wasm32-unknown-emscripten build flow, including the experimental #[wasm_bindgen(experimental_tokio)] attribute for driving an exported async function on a Tokio event-loop runtime there, gated behind --cfg wasm_bindgen_unstable_tokio. #5334

• Added experimental JSPI support on the wasm32-unknown-emscripten target, gated behind --cfg wasm_bindgen_unstable_jspi: #[wasm_bindgen(jspi)], #[wasm_bindgen(suspending)], jspi_block_on_promise and the JSPI context inheritance of spawn_local work when linking with -sJSPI and -sJSPI_HOOKS (or -sREENTRANT_JSPI). The fibers belong to Emscripten's JSPI runtime, which wasm-bindgen integrates with through its lifecycle hook exports instead of its own shadow stack management. jspi combines with experimental_tokio into a parked runtime: the export is a promising activation running its future with block_on on a Tokio runtime whose waits are JSPI suspensions, so invocations interleave at every wait. #5333

Changed

• Library MSRV bumped from 1.77 to 1.81, per the 2-year MSRV policy. #5257

Fixed

• The wasm_bindgen, wasm_bindgen_futures and js_sys crate-path options on a #[wasm_bindgen] impl block now apply to its methods; previously they were ignored there. #5333

• Struct field getters no longer trigger the unsafe_op_in_unsafe_fn lint (warn by default in edition 2024) when the field name comes from a macro_rules! body, for example through paste!. #4465

• The headless test runner now keeps the path of a remote WebDriver URL set with variables like CHROMEDRIVER_REMOTE. A driver at http://host/wd/hub/ now gets http://host/wd/hub/session instead of http://host/session. #2841

• The bundler entry module no longer re-exports #[wasm_bindgen(private)] items from *_bg.js, which does not export them. #5343

• web-sys: WebGL extension interfaces declared with LegacyNoInterfaceObject (OVR_multiview2, WEBGL_multi_draw, EXT_polygon_offset_clamp) now generate is_type_of = |_| false like their NoInterfaceObject counterparts. #5336

• The blanket From<E: Error> for JsError impl is now available without the std feature, using core::error::Error, so ? works in no_std crates. #5029

• Emscripten output no longer emits the instance reinit machinery, which Emscripten's JS compiler rejected (unescaped multi-line __postset, and var reinit_scheduled = let ...): schedule_reinit() is a no-op there since Emscripten owns instantiation. The closure finalization __postset is now emitted as an escaped string literal. #5332

• Updated walrus to 0.27.2, fixing --keep-debug output that wasm-opt -g could not process: .debug_loc entries for removed code were unparseable (debug_loc error), and DW_AT_high_pc was re-encoded as variable-width udata (compile unit size was incorrect). #5328

• The headless test runner no longer hangs on a WebDriver that never answers, or on a browser holding the driver's stdio pipes open. #5338

• The CLI's schema version mismatch error now names the input Wasm file and the path of the running wasm-bindgen binary. #4430

• #[wasm_bindgen(inspectable)] on a tuple struct no longer generates invalid JavaScript. The generated toJSON now reads the 0, 1, ... fields as this["0"] instead of this.0. #2573