Upgrade Electron to 39.2.7 to fix macOS Tahoe GPU performance regression

[Copilot]

Electron versions prior to 36.9.2/37.6.0/38.2.0 suffer from a major GPU performance regression on macOS 15 (Tahoe). This updates to the latest stable release (39.2.7).

Changes

• Electron: 29.2.0 → 39.2.7
• Type compatibility fixes for stricter Electron 39 type enforcement:
  • SaveDialogReturnValue.filePath: Changed from undefined to empty string when dialog is canceled
  • Iterator usage: Replaced for...of over Map.entries() with Array.from() for ES2017 target compatibility

Example

// Before (fails type check in Electron 39)
backendRpc.on(makeSaveDialogRpc(), async request => {
  return { canceled: true, filePath: undefined }
})

// After
backendRpc.on(makeSaveDialogRpc(), async request => {
  return { canceled: true, filePath: '' }
})

// Before (compilation error with ES2017 target)
for (const [connectionId, webContentsId] of this.connectionOwners.entries()) {
  if (webContentsId === sender.id) {
    this.connectionOwners.delete(connectionId)
  }
}

// After
Array.from(this.connectionOwners.entries()).forEach(([connectionId, webContentsId]) => {
  if (webContentsId === sender.id) {
    this.connectionOwners.delete(connectionId)
  }
})

Screenshot

Application running with Electron 39.2.7:

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• app-telemetry.t7n.de
  • Triggering command: /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler --monitor-self-annotation=ptype=crashpad-handler --no-rate-limit --database=/home/REDACTED/.config/MQTT-Explorer/Crashpad --url=REDACTED --annotation=_companyName=thomasnordquist --annotation=_productName=MQTT Explorer --annotation=_version=0.4.0-beta.5 --annotation=lsb-release=Ubuntu 24.04.3 LTS --annotation=plat=Linux --annotation=prod=Electron --annotation=ver=38.7.2 --initial-client-fd=61 --shared-client-connection (dns block)
  • Triggering command: /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler --monitor-self-annotation=ptype=crashpad-handler --no-rate-limit --database=/home/REDACTED/.config/MQTT-Explorer/Crashpad --url=REDACTED --annotation=_companyName=thomasnordquist --annotation=_productName=MQTT Explorer --annotation=_version=0.4.0-beta.5 --annotation=lsb-release=Ubuntu 24.04.3 LTS --annotation=plat=Linux --annotation=prod=Electron --annotation=ver=38.7.2 --initial-client-fd=64 --shared-client-connection (dns block)
  • Triggering command: /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/chrome_crashpad_handler --monitor-self-annotation=ptype=crashpad-handler --no-rate-limit --database=/home/REDACTED/.config/MQTT-Explorer/Crashpad --url=REDACTED --annotation=_companyName=thomasnordquist --annotation=_productName=MQTT Explorer --annotation=_version=0.4.0-beta.5 --annotation=lsb-release=Ubuntu 24.04.3 LTS --annotation=plat=Linux --annotation=prod=Electron --annotation=ver=38.7.2 --initial-client-fd=56 --shared-client-connection (dns block)
• redirector.gvt1.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --crashpad-handler-pid=4007 --enable-crash-reporter=21f844bd-a28f-4123-9113-645cfd46fc8e,no_channel --user-data-dir=/home/REDACTED/.config/MQTT-Explorer --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,3276333164901190862,7085038990776519106,262144 --enable-features=PdfUseShowSaveFilePicker --disable-features=ScreenAIOCREnabled,SpareRendererForSitePerProcess,TraceSiteInstanceGetProcessCreation --variations-seed-version (dns block)
  • Triggering command: /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/electron /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer/node_modules/electron/dist/electron /home/REDACTED/work/MQTT-Explorer/MQTT-Explorer --enable-mcp-introspection --remote-debugging-port=9222 --no-sandbox (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --crashpad-handler-pid=4273 --enable-crash-reporter=21f844bd-a28f-4123-9113-645cfd46fc8e,no_channel --user-data-dir=/home/REDACTED/.config/MQTT-Explorer --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,14665164224057329752,10124714749095546070,262144 --enable-features=NetworkService,NetworkServiceInProcess,PdfUseShowSaveFilePicker --disable-features=AcceptCHFrame,AutoExpandDetailsElement,AvoidUnnecessaryBeforeUnloadCheckSync,CertificateTransparencyComponentUpdater,DestroyProfileOnBrowserClose,DialMediaRouteProvider,GlobalMediaControls,HttpsUpgrades,ImprovedCookieControls,LazyFrameL (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>MacOS Tahoe: Bump Electron to at least versions v38.2.0, v37.6.0 and v36.9.2</issue_title>
<issue_description>Major GPU performance issue on macOS 26 (electron/electron#48376).

https://www.heise.de/news/Electron-Nerv-App-zeigt-welche-Programme-mit-macOS-Tahoe-Probleme-machen-10865895.html?seite=all</issue_description>

<agent_instructions>Update electron, ensure demo video still runs, provide screenshots</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@thomasnordquist I'll try to get all dependencies updated.

• Fixes MacOS Tahoe: Bump Electron to at least versions v38.2.0, v37.6.0 and v36.9.2 #908

---

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[thomasnordquist]

@copilot tests are failing with
$ mocha --require ts-node/register --require source-map-support/register --recursive ./src//**/.spec.ts

Exception during run: ../events/EventSystem/IpcMainEventBus.ts(29,55): error TS2802: Type 'IterableIterator<[string, number]>' can only be iterated through when using the '--downlevelIteration' flag or with a '--target' of 'es2015' or higher.