Make usb-power an optional package

lib/android/index.js

@@ -5,10 +5,10 @@ import { EOL as endOfLine } from 'node:os';
 import { execa } from 'execa';
 import { getLogger } from '@sitespeed.io/log';
 import pkg from '@devicefarmer/adbkit';
-import usbPowerProfiler from 'usb-power-profiling/usb-power-profiling.js';
 const { Adb } = pkg;
 import get from 'lodash.get';
 import { pathToFolder } from '../support/pathToFolder.js';
+import { loadUsbPowerProfiler } from '../support/usbPower.js';
 const log = getLogger('browsertime.android');
 const mkdir = promisify(_mkdir);
 const delay = ms => new Promise(res => setTimeout(res, ms));
@@ -474,6 +474,11 @@ export class Android {
   }
 
   async getUsbPowerUsageProfile(index, url, result, options, storageManager) {
+    const usbPowerProfiler = await loadUsbPowerProfiler();
+    if (!usbPowerProfiler) {
+      log.info('USB profiler is not installed');
+      return;
+    }
     let profileData = await usbPowerProfiler.profileFromData();
     let destinationFilename = path.join(
       await pathToFolder(url, options),
@@ -485,6 +490,11 @@ export class Android {
 }
 
 async function getUsbPowerUsage(startTime, endTime) {
+  const usbPowerProfiler = await loadUsbPowerProfiler();
+  if (!usbPowerProfiler) {
+    log.info('USB profiler is not installed');
+    return;
+  }
   let baselineUsageData = await usbPowerProfiler.getPowerData(
     startTime - 2,
     endTime - 1

lib/chrome/webdriver/chromium.js

@@ -3,7 +3,6 @@ import { unlink as _unlink, rm as _rm } from 'node:fs';
 import path from 'node:path';
 import { logging } from 'selenium-webdriver';
 import { getLogger } from '@sitespeed.io/log';
-import usbPowerProfiler from 'usb-power-profiling/usb-power-profiling.js';
 const log = getLogger('browsertime.chrome');
 const { Type } = logging;
 import { longTaskMetrics } from '../longTaskMetrics.js';
@@ -14,6 +13,7 @@ import { toArray } from '../../support/util.js';
 import { logging as _logging } from 'selenium-webdriver';
 import { parse } from '../traceCategoriesParser.js';
 import { pathToFolder } from '../../support/pathToFolder.js';
+import { loadUsbPowerProfiler } from '../../support/usbPower.js';
 import { ChromeDevtoolsProtocol } from '../chromeDevtoolsProtocol.js';
 import { NetworkManager } from '../networkManager.js';
 import { Android, isAndroidConfigured } from '../../android/index.js';
@@ -80,7 +80,10 @@ export class Chromium {
       await this.android.addDevtoolsFw();
 
       if (this.options.androidUsbPower) {
-        usbPowerProfiler.startSampling();
+        const usbPowerProfiler = await loadUsbPowerProfiler();
+        if (usbPowerProfiler) {
+          usbPowerProfiler.startSampling();
+        }
       }
     }
 
@@ -171,7 +174,10 @@ export class Chromium {
       if (this.options.androidPower) {
         await this.android.resetPowerUsage();
       } else if (this.options.androidUsbPower) {
-        await usbPowerProfiler.resetPowerData();
+        const usbPowerProfiler = await loadUsbPowerProfiler();
+        if (usbPowerProfiler) {
+          await usbPowerProfiler.resetPowerData();
+        }
       }
     }
 
@@ -511,7 +517,10 @@ export class Chromium {
       if (this.options.androidPower) {
         await this.android.stopPowerTesting();
       } else if (this.options.androidUsbPower) {
-        await usbPowerProfiler.stopSampling();
+        const usbPowerProfiler = await loadUsbPowerProfiler();
+        if (usbPowerProfiler) {
+          await usbPowerProfiler.stopSampling();
+        }
       }
     }
 

lib/firefox/webdriver/firefox.js

@@ -3,9 +3,9 @@ import { promisify } from 'node:util';
 import path from 'node:path';
 import { getLogger } from '@sitespeed.io/log';
 import get from 'lodash.get';
-import usbPowerProfiler from 'usb-power-profiling/usb-power-profiling.js';
 import { adapters } from 'ff-test-bidi-har-export';
 import { getEmptyHAR, mergeHars } from '../../support/har/index.js';
+import { loadUsbPowerProfiler } from '../../support/usbPower.js';
 import { pathToFolder } from '../../support/pathToFolder.js';
 import { isAndroidConfigured, Android } from '../../android/index.js';
 import { adjustVisualProgressTimestamps } from '../../support/util.js';
@@ -75,7 +75,10 @@ export class Firefox {
     );
 
     if (isAndroidConfigured(this.options) && this.options.androidUsbPower) {
-      usbPowerProfiler.startSampling();
+      const usbPowerProfiler = await loadUsbPowerProfiler();
+      if (usbPowerProfiler) {
+        usbPowerProfiler.startSampling();
+      }
     }
   }
 
@@ -144,7 +147,10 @@ export class Firefox {
       if (this.options.androidPower) {
         await this.android.resetPowerUsage();
       } else if (this.options.androidUsbPower) {
-        await usbPowerProfiler.resetPowerData();
+        const usbPowerProfiler = await loadUsbPowerProfiler();
+        if (usbPowerProfiler) {
+          await usbPowerProfiler.resetPowerData();
+        }
       }
     }
 
@@ -408,7 +414,10 @@ export class Firefox {
       if (this.options.androidPower) {
         await this.android.stopPowerTesting();
       } else if (this.options.androidUsbPower) {
-        await usbPowerProfiler.stopSampling();
+        const usbPowerProfiler = await loadUsbPowerProfiler();
+        if (usbPowerProfiler) {
+          await usbPowerProfiler.stopSampling();
+        }
       }
     }
   }

lib/support/usbPower.js

@@ -0,0 +1,11 @@
+export async function loadUsbPowerProfiler() {
+  try {
+    // usb-power-profiling/usb-power-profiling.js exports a default, so we destructure it
+    const { default: usbPowerProfiler } = await import(
+      'usb-power-profiling/usb-power-profiling.js'
+    );
+    return usbPowerProfiler;
+  } catch {
+    return;
+  }
+}