Strongly-type USB speed

Author: thegecko

header.d.ts

@@ -0,0 +1 @@
+export type USBSpeed = 'low' | 'full' | 'high' | 'super' | 'superPlus';

package.json

@@ -65,6 +65,7 @@
   "napi": {
     "binaryName": "usb",
     "packageName": "@node-usb/usb",
+    "dtsHeaderFile": "./header.d.ts",
     "targets": [
       "x86_64-pc-windows-msvc",
       "x86_64-apple-darwin",

src/webusb_device.rs

@@ -171,7 +171,7 @@ pub struct UsbDevice {
     pub bus: String,
     #[napi(writable = false)]
     pub address: u8,
-    #[napi(writable = false)]
+    #[napi(writable = false, ts_type = "USBSpeed")]
     pub speed: Option<String>,
 }
 
@@ -200,11 +200,11 @@ impl UsbDevice {
             address: device_info.device_address(),
             speed: match device_info.speed() {
                 Some(speed) => match speed {
-                    nusb::Speed::Low => Some("Low".to_string()),
-                    nusb::Speed::Full => Some("Full".to_string()),
-                    nusb::Speed::High => Some("High".to_string()),
-                    nusb::Speed::Super => Some("Super".to_string()),
-                    nusb::Speed::SuperPlus => Some("SuperPlus".to_string()),
+                    nusb::Speed::Low => Some("low".to_string()),
+                    nusb::Speed::Full => Some("full".to_string()),
+                    nusb::Speed::High => Some("high".to_string()),
+                    nusb::Speed::Super => Some("super".to_string()),
+                    nusb::Speed::SuperPlus => Some("superPlus".to_string()),
                     _ => None,
                 },
                 None => None,

tsc/index.ts

@@ -1,4 +1,4 @@
-import { nativeGetDeviceList, nativeFindByIds, nativeFindBySerialNumber, UsbDevice, Emitter } from '../index.js'
+import { nativeGetDeviceList, nativeFindByIds, nativeFindBySerialNumber, UsbDevice, Emitter, USBSpeed } from '../index.js'
 
 const DEFAULT_TIMEOUT = 1000;
 
@@ -19,7 +19,7 @@ interface WebUSBDevice extends USBDevice {
     /**
      * The USB speed of the device (e.g. `Low`, `Full`, `High`, `Super`, `SuperPlus` or `undefined` if unknown)
      */
-    speed?: string;
+    speed?: USBSpeed;
 
     /**
      * Detaches the kernel driver from the specified interface number (Linux only)