fix: hack to fix issue in Electron

packages/node/src/node-hid-wrapper.ts

@@ -23,6 +23,11 @@ export class NodeHIDDevice extends EventEmitter implements HIDDevice {
 	public async close(): Promise<void> {
 		this.device.close()
 
+		// For some unknown reason, we need to wait a bit before returning because it
+		// appears that the HID-device isn't actually closed properly until after a short while.
+		// (This issue has been observed in Electron, where a app.quit() causes the application to crash with "Exit status 3221226505".)
+		await new Promise((resolve) => setTimeout(resolve, 300))
+
 		this.device.removeListener('error', this._handleError)
 		this.device.removeListener('data', this._handleData)
 	}

packages/node/src/watcher.ts

@@ -88,7 +88,7 @@ export class XKeysWatcher extends EventEmitter {
 	 * Stop the watcher
 	 * @param closeAllDevices Set to false in order to NOT close all devices. Use this if you only want to stop the watching. Defaults to true
 	 */
-	public async stop(closeAllDevices: boolean = true): Promise<void> {
+	public async stop(closeAllDevices = true): Promise<void> {
 		this.isMonitoring = false
 
 		// Remove the listeners:
@@ -105,9 +105,11 @@ export class XKeysWatcher extends EventEmitter {
 		if (closeAllDevices) {
 			// In order for an application to close gracefully,
 			// we need to close all devices that we've called setupXkeysPanel() on:
+			const ps: Promise<void>[] = []
 			for (const xKeysPanel of this.setupXkeysPanels) {
-				await xKeysPanel.close()
+				ps.push(xKeysPanel.close())
 			}
+			await Promise.all(ps)
 		}
 	}
 	private onAddedUSBDevice = (_device: USBDetectNS.Device) => {