registerExtensionIdempotent function

void registerExtensionIdempotent(String method, ServiceExtensionHandler handler)

Calls developer.registerExtension swallowing the duplicate-registration ArgumentError that fires when the same extension name is registered twice within a single isolate.

Why: VM Service extension table persists across hot-restart, so a second install() call on the plugin layer would otherwise throw. Wrapping the registration call in this idempotent helper keeps host-side <Plugin>Plugin.install() safe to call repeatedly (or to be called by both the host app and an integration adapter shipped from a sibling package without coordination).

Hot-restart-safety contract documented in the V3 ai-test plugin's v3_register.dart and inherited by fluttersdk_artisan as the substrate for dusk + telescope + tinker + magic_tinker extension registrations.

Implementation

void registerExtensionIdempotent(
  String method,
  developer.ServiceExtensionHandler handler,
) {
  try {
    developer.registerExtension(method, handler);
  } on ArgumentError catch (e) {
    // VM rejects duplicate registration of the same method name. Swallow the
    // specific "already registered" message; rethrow anything else.
    final msg = e.message?.toString() ?? '';
    if (!msg.contains('already registered') && !msg.contains('Extension')) {
      rethrow;
    }
    // Idempotent re-registration: silently no-op.
  }
}