Make devicesFound callback and return optional

Author: thegecko

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "webusb",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Node.js implementation of the WebUSB Specification",
   "homepage": "https://github.com/thegecko/webusb",
   "author": "Rob Moran <[email protected]>",

package.json

@@ -471,7 +471,7 @@ export class USBAdapter extends EventEmitter implements Adapter {
             ? bufferSource.buffer.slice(bufferSource.byteOffset, bufferSource.byteOffset + bufferSource.byteLength)
             : bufferSource;
 
-        return new Buffer(arrayBuffer);
+        return Buffer.from(arrayBuffer);
     }
 
     private getEndpoint(device: Device, direction: USBDirection, endpointNumber: number): Endpoint {

src/adapter.ts

@@ -33,7 +33,7 @@ export interface USBOptions {
     /**
      * A `device found` callback function to allow the user to select a device
      */
-    devicesFound?: (devices: Array<USBDevice>, selectFn: (device: USBDevice) => void) => USBDevice;
+    devicesFound?: (devices: Array<USBDevice>, selectFn?: (device: USBDevice) => void) => USBDevice | void;
 }
 
 /**

src/interfaces.ts

@@ -45,7 +45,7 @@ export class USB extends EventDispatcher {
     public static EVENT_DEVICE_DISCONNECT: string = "disconnect";
 
     private allowedDevices: Array<USBDevice> = [];
-    private devicesFound: (devices: Array<USBDevice>, selectFn: (device: USBDevice) => void) => USBDevice = null;
+    private devicesFound: (devices: Array<USBDevice>, selectFn?: (device: USBDevice) => void) => USBDevice | void;
 
     /**
      * USB constructor