[teoboetti]

Summary

A device selector modelled on the Flutter extension's (Dart-Code device_manager.ts):

• Status bar item (far right): shows the selected device, e.g. Pixel_7_API_34 (android emulator), iPhone 17 (ios simulator), Pixel 8 (android), or No Device. The tooltip shows how many devices are connected. Clicking it runs React Native: Select Device.
• Picker ("Select a device to use"):
  • Available Devices lists everything running.
  • Offline Emulators has Start <AVD> rows (each with a cold-boot variant) and Start <iOS simulator> rows.
  • The list refreshes live while the picker is open.
• Starting a device reuses the existing boot-and-wait code. Once the device connects it becomes the selected one. After booting a simulator it opens DeviceHub (Xcode 27+) or Simulator.app.
• Selection rules follow Flutter's defaults:
  • The selection is saved per workspace.
  • A newly connected device becomes selected, unless the current device is one you picked.
  • Your picked device is re-selected when it reconnects.
• F5: for Android and iOS launch configs, target is filled from the selected device when the config leaves it open: empty, or simulator/device when the device type matches. An explicit target always wins. A platform mismatch logs a one-line note and falls back to the existing behaviour. launch.json is never written.

Changes

• New src/extension/deviceSelector.ts: pure helpers plus the DeviceSelector class (refresh, picker, launching, resolveDebugConfiguration).
• New reactNative.selectDevice command and FailedToSelectDevice error code.
• AndroidTargetManager.launchSimulator and IOSTargetManager.launchSimulator are now public. Android takes a coldBoot flag (-no-snapshot-load).
• Removed DeviceStatusIndicator; the new status bar item replaces it.

Refreshing

• Every 5 s, only while the window is focused, plus immediately on focus and when the picker opens.
• Physical iPhones (xctrace, about 2.5 s per call) refresh every 6th tick and when the picker opens.
• Failures, such as a missing SDK, are logged once per source.

Testing

• 22 new unit tests: status bar text, picker items, selection rules, the F5 target rule, Android device mapping, and the cold-boot argument.
• npm test: 496 passing, 0 failing.
• npx gulp lint: clean.
• Installed as a dev VSIX in VSCodium and checked by hand.

Known limitations

• A physical iPhone can take up to about 30 s to appear in the status bar. It appears at once in the picker.
• Configs where the extension already saved a target into launch.json keep using it. Delete that line to let the selector drive.
• Android emulators are listed with emulator from PATH, as the existing "Launch Android Emulator" command does.