Add dataview attribute output to WebIDL Codegen (#2316)

* Add Dataview as a valid attribute type for WebIDL Codegen

Some WebIDL specs (WebBluetooth, WebUSB, etc) use DataView as an
attribute type. These attributes should map to a js_sys::DataView type.

Fixes #2312

* Generate missing DataView attrs for WebBluetooth

WebBluetooth has a couple DataView attrs that are required for
certain core functionality. These were not being generated when the
original patch was landed, but after the DataView fix, they now show
up.

crates/web-sys/Cargo.toml

@@ -247,6 +247,7 @@ CustomEventInit = []
 DataTransfer = []
 DataTransferItem = []
 DataTransferItemList = []
+DataView = []
 DateTimeValue = []
 DecoderDoctorNotification = []
 DecoderDoctorNotificationType = []

crates/web-sys/src/features/gen_BluetoothRemoteGattCharacteristic.rs

@@ -53,6 +53,18 @@ extern "C" {
         this: &BluetoothRemoteGattCharacteristic,
     ) -> BluetoothCharacteristicProperties;
     #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "DataView")]
+    # [wasm_bindgen (structural , method , getter , js_class = "BluetoothRemoteGATTCharacteristic" , js_name = value)]
+    #[doc = "Getter for the `value` field of this object."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/BluetoothRemoteGATTCharacteristic/value)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `BluetoothRemoteGattCharacteristic`, `DataView`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn value(this: &BluetoothRemoteGattCharacteristic) -> Option<::js_sys::DataView>;
+    #[cfg(web_sys_unstable_apis)]
     # [wasm_bindgen (structural , method , getter , js_class = "BluetoothRemoteGATTCharacteristic" , js_name = oncharacteristicvaluechanged)]
     #[doc = "Getter for the `oncharacteristicvaluechanged` field of this object."]
     #[doc = ""]

crates/web-sys/src/features/gen_BluetoothRemoteGattDescriptor.rs

@@ -41,6 +41,18 @@ extern "C" {
     #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
     pub fn uuid(this: &BluetoothRemoteGattDescriptor) -> String;
     #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "DataView")]
+    # [wasm_bindgen (structural , method , getter , js_class = "BluetoothRemoteGATTDescriptor" , js_name = value)]
+    #[doc = "Getter for the `value` field of this object."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/BluetoothRemoteGATTDescriptor/value)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `BluetoothRemoteGattDescriptor`, `DataView`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn value(this: &BluetoothRemoteGattDescriptor) -> Option<::js_sys::DataView>;
+    #[cfg(web_sys_unstable_apis)]
     # [wasm_bindgen (method , structural , js_class = "BluetoothRemoteGATTDescriptor" , js_name = readValue)]
     #[doc = "The `readValue()` method."]
     #[doc = ""]

crates/webidl/src/idl_type.rs

@@ -547,7 +547,7 @@ impl<'a> IdlType<'a> {
             IdlType::Error => Err(TypeError::CannotConvert),
 
             IdlType::ArrayBuffer => Ok(js_sys("ArrayBuffer")),
-            IdlType::DataView => Err(TypeError::CannotConvert),
+            IdlType::DataView => Ok(js_sys("DataView")),
             IdlType::Int8Array { immutable } => Ok(Some(array("i8", pos, *immutable))),
             IdlType::Uint8Array { immutable } => Ok(Some(array("u8", pos, *immutable))),
             IdlType::Uint8ClampedArray { immutable } => {