Filter out emulator error message (#29)

On my computer, `emulator -list-avds` shows an error first and then
lists AVD ids. This change filters it.

```
INFO    | Storing crashdata in: /tmp/android-jgonet/emu-crash-34.1.19.db, detection is enabled for process: 80542
Pixel_3a_API_34_extension_level_7_arm64-v8a
```

packages/vscode-extension/src/devices/AndroidEmulatorDevice.ts

@@ -306,13 +306,20 @@ export async function createEmulator(displayName: string, systemImage: AndroidSy
     available: true, // TODO: there is no easy way to check if emulator is available, we'd need to parse config.ini
   } as DeviceInfo;
 }
-
-export async function listEmulators() {
-  const avdDirectory = getOrCreateAvdDirectory();
+const UUID_REGEX = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/;
+async function getAvdIds(avdDirectory: string) {
   const { stdout } = await exec(EMULATOR_BINARY, ["-list-avds"], {
     env: { ...process.env, ANDROID_AVD_HOME: avdDirectory },
   });
-  const avdIds = stdout.split("\n").filter((avdId) => !!avdId);
+
+  // filters out error messages and empty lines
+  // https://github.com/react-native-community/cli/issues/1801#issuecomment-1980580355
+  return stdout.split("\n").filter((id) => UUID_REGEX.test(id));
+}
+
+export async function listEmulators() {
+  const avdDirectory = getOrCreateAvdDirectory();
+  const avdIds = await getAvdIds(avdDirectory);
   const systemImages = await getAndroidSystemImages();
   return Promise.all(
     avdIds.map(async (avdId) => {

packages/vscode-extension/src/devices/DeviceManager.ts

@@ -85,7 +85,7 @@ export class DeviceManager implements Disposable, DeviceManagerInterface {
 
   private async loadDevicesInternal() {
     const emulators = listEmulators().catch((e) => {
-      Logger.error("Error fetching emulatos", e);
+      Logger.error("Error fetching emulators", e);
       return [];
     });
     const simulators = listSimulators().catch((e) => {