Bump wasm-bindgen from 0.2.121 to 0.2.122

[dependabot]

Bumps wasm-bindgen from 0.2.121 to 0.2.122.

Release notes

Sourced from wasm-bindgen's releases.

0.2.122

Notices

• Threading support now requires -Clink-arg=--export=__heap_base to be set in RUSTFLAGS for nightly toolchains from 2026-05-06 onward, after rust-lang/rust#156174 removed the implicit __heap_base/__data_end exports on wasm* targets. Atomics CI, CLI reference tests, and the nodejs-threads, raytrace-parallel, and wasm-audio-worklet examples have been updated to pass --export=__heap_base explicitly. The flag is backward-compatible with older nightlies.

• -Cpanic=unwind on wasm targets now emits modern (exnref) exception handling by default after rust-lang/rust#156061, and requires Node.js 22.22.3+ (for WebAssembly.JSTag). Legacy EH wasm can still be produced on current nightlies by adding -Cllvm-args=-wasm-use-legacy-eh to RUSTFLAGS; Node.js 20 may be supported with legacy exception handling, with a tracking issue in #5151.

Added

• Implemented TryFromJsValue for Vec<T> where T: TryFromJsValue. A JS value converts when it is a real Array (per Array.isArray) and every element converts via T::try_from_js_value. This composes recursively (Vec<Vec<String>>, Vec<Option<T>>) and works for any T with a TryFromJsValue impl, including primitives, String, JsValue, and JsCast types. Array-likes (objects with length and numeric indices) are intentionally rejected to mirror the static ABI representation used by js_value_vector_from_abi.

• New extends_js_class and extends_js_namespace attributes on exported structs to allow defining the parent js_class name when it has been customized by js_name and the parent's own js_namespace as well in turn. New validation is added at code generation time that will now catch these cases instead of emitting invalid code. Example:

  #[wasm_bindgen(js_name = "Animal", js_namespace = zoo)]
  pub struct AnimalImpl { /* ... */ }
  #[wasm_bindgen(
  extends = AnimalImpl,
  extends_js_class = "Animal",
  extends_js_namespace = zoo,
  )]
  pub struct DogImpl { /* ... */ }

  #5154

... (truncated)

Changelog

Sourced from wasm-bindgen's changelog.

0.2.122

Notices

• Threading support now requires -Clink-arg=--export=__heap_base to be set in RUSTFLAGS for nightly toolchains from 2026-05-06 onward, after rust-lang/rust#156174 removed the implicit __heap_base/__data_end exports on wasm* targets. Atomics CI, CLI reference tests, and the nodejs-threads, raytrace-parallel, and wasm-audio-worklet examples have been updated to pass --export=__heap_base explicitly. The flag is backward-compatible with older nightlies.

• -Cpanic=unwind on wasm targets now emits modern (exnref) exception handling by default after rust-lang/rust#156061, and requires Node.js 22.22.3+ (for WebAssembly.JSTag). Legacy EH wasm can still be produced on current nightlies by adding -Cllvm-args=-wasm-use-legacy-eh to RUSTFLAGS; Node.js 20 may be supported with legacy exception handling, with a tracking issue in #5151.

Added

• Implemented TryFromJsValue for Vec<T> where T: TryFromJsValue. A JS value converts when it is a real Array (per Array.isArray) and every element converts via T::try_from_js_value. This composes recursively (Vec<Vec<String>>, Vec<Option<T>>) and works for any T with a TryFromJsValue impl, including primitives, String, JsValue, and JsCast types. Array-likes (objects with length and numeric indices) are intentionally rejected to mirror the static ABI representation used by js_value_vector_from_abi.

• New extends_js_class and extends_js_namespace attributes on exported structs to allow defining the parent js_class name when it has been customized by js_name and the parent's own js_namespace as well in turn. New validation is added at code generation time that will now catch these cases instead of emitting invalid code. Example:

  #[wasm_bindgen(js_name = "Animal", js_namespace = zoo)]
  pub struct AnimalImpl { /* ... */ }
  #[wasm_bindgen(
  extends = AnimalImpl,
  extends_js_class = "Animal",
  extends_js_namespace = zoo,
  )]
  pub struct DogImpl { /* ... */ }

... (truncated)

Commits

• ddd3225 release: 0.2.122 - schema bump (#5162)
• a64603e Fix emscripten output: dep graph, HEAP_DATA_VIEW, function declarations (#5156)
• 2c543af Implement TryFromJsValue for Vec<T> (#5150)
• fabc617 fix: key WrapInExportedClass/UnwrapExportedClass by qualified_name (renamed-s...
• 32d8df2 drop codspeed runner (#5161)
• f5bf1c8 fix: Handle Br and BrIf instructions in the descriptor interpreter (#5158)
• bbcdb9c fix: route methods to the right class when js_name + js_namespace + js_class ...
• 8b5d213 Enforce unwind safety on #[wasm_bindgen] exports under panic=unwind (#5128)
• e4fdb2c ci: pin legacy EH job to nightly-2026-05-12 (#5155)
• 14b86ad Add --export=__heap_base for threading after rust-lang/rust#156174 (#5152)
• See full diff in compare view

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