Safe check for undefined interfaceNumber

Author: thegecko

src/transport/usb.ts

@@ -188,7 +188,7 @@ export class USB implements Transport {
      */
     public read(): Promise<DataView> {
         return new Promise((resolve, reject) => {
-            if (!this.interfaceNumber) return reject("No device opened");
+            if (this.interfaceNumber === undefined) return reject("No device opened");
 
             // Use endpoint if it exists
             if (this.endpointIn) {
@@ -225,7 +225,7 @@ export class USB implements Transport {
         const buffer = this.bufferSourceToBuffer(extended);
 
         return new Promise((resolve, reject) => {
-            if (!this.interfaceNumber) return reject("No device opened");
+            if (this.interfaceNumber === undefined) return reject("No device opened");
 
             // Use endpoint if it exists
             if (this.endpointOut) {

src/transport/webusb.ts

@@ -140,7 +140,7 @@ export class WebUSB implements Transport {
      * @returns Promise of DataView
      */
     public read(): Promise<DataView> {
-        if (!this.interfaceNumber) return Promise.reject("No device opened");
+        if (this.interfaceNumber === undefined) return Promise.reject("No device opened");
 
         // Use endpoint if it exists
         if (this.endpointIn) {
@@ -171,7 +171,7 @@ export class WebUSB implements Transport {
      * @returns Promise
      */
     public write(data: BufferSource): Promise<void> {
-        if (!this.interfaceNumber) return Promise.reject("No device opened");
+        if (this.interfaceNumber === undefined) return Promise.reject("No device opened");
 
         const buffer = this.extendBuffer(data, this.packetSize);