directly return Option instead of WasmOption (#823)

Author: mockersf

Cargo.toml

@@ -61,7 +61,7 @@ coreaudio-rs = { version = "0.11", default-features = false, features = ["audio_
 coreaudio-rs = { version = "0.11", default-features = false, features = ["audio_unit", "core_audio", "audio_toolbox"] }
 
 [target.'cfg(target_os = "emscripten")'.dependencies]
-wasm-bindgen = { version = "0.2.58" }
+wasm-bindgen = { version = "0.2.89" }
 wasm-bindgen-futures = "0.4.33"
 js-sys = { version = "0.3.35" }
 web-sys = { version = "0.3.35", features = [ "AudioContext", "AudioContextOptions", "AudioBuffer", "AudioBufferSourceNode", "AudioNode",  "AudioDestinationNode", "Window", "AudioContextState"] }

src/lib.rs

@@ -243,7 +243,7 @@ impl wasm_bindgen::describe::WasmDescribe for BufferSize {
 
 #[cfg(target_os = "emscripten")]
 impl wasm_bindgen::convert::IntoWasmAbi for BufferSize {
-    type Abi = wasm_bindgen::convert::WasmOption<u32>;
+    type Abi = Option<u32>;
     fn into_abi(self) -> Self::Abi {
         match self {
             Self::Default => None,