make usb an optional dependency (#240)

package.json

@@ -448,7 +448,9 @@
     "seek-bzip": "^2.0.0",
     "semver": "^7.5.2",
     "tar-fs": "^2.1.1",
-    "universal-analytics": "^0.5.3",
+    "universal-analytics": "^0.5.3"
+  },
+  "optionalDependencies": {
     "usb": "^2.10.0"
   }
 }

src/device.ts

@@ -5,7 +5,11 @@ import { prosLogger } from "./extension";
 import { PREFIX } from "./commands/cli-parsing";
 import { StatusBarItem, window, workspace } from "vscode";
 import { BaseCommand } from "./commands";
-import { usb } from "usb";
+try {
+  var usb = require("usb").usb;
+} catch (err) {
+  usb = null;
+}
 
 /* eslint-disable @typescript-eslint/naming-convention */
 export type DeviceInfo = {
@@ -269,12 +273,14 @@ export const setTeam = async (team: string): Promise<void> => {
 };
 
 export const startPortMonitoring = (status: StatusBarItem): void => {
-  status.show();
-  usb.addListener("attach", () => {
-    resolvePort(status);
-  });
-  usb.addListener("detach", () => {
+  if (usb) {
+    status.show();
+    usb.addListener("attach", () => {
+      resolvePort(status);
+    });
+    usb.addListener("detach", () => {
+      resolvePort(status);
+    });
     resolvePort(status);
-  });
-  resolvePort(status);
+  }
 };

src/views/brain-view.ts

@@ -8,7 +8,11 @@ import {
   setTeam,
 } from "../device";
 import { getNonce } from "./nonce";
-import { usb } from "usb";
+try {
+  var usb = require("usb").usb;
+} catch (err) {
+  usb = null;
+}
 
 export class BrainViewProvider implements vscode.WebviewViewProvider {
   public static readonly viewType = "pros.brainView";
@@ -51,16 +55,18 @@ export class BrainViewProvider implements vscode.WebviewViewProvider {
           break;
       }
     });
-    usb.addListener("attach", () => {
-      setTimeout(() => {
-        this.updateDeviceList();
-      }, 1000);
-    });
-    usb.addListener("detach", () => {
-      setTimeout(() => {
-        this.updateDeviceList();
-      }, 1000);
-    });
+    if (usb) {
+      usb.addListener("attach", () => {
+        setTimeout(() => {
+          this.updateDeviceList();
+        }, 1000);
+      });
+      usb.addListener("detach", () => {
+        setTimeout(() => {
+          this.updateDeviceList();
+        }, 1000);
+      });
+    }
     this.updateDeviceList();
   }