message: Add default effect error case.
diff: @@ -79,6 +79,7 @@ function applyWidgetEffect(widget: WidgetIdentifier, file_name: string, effect:
  console.log(`Custom widget effect: ${effect.key} -- ${effect.value}`);
  break;
  default:
  + console.error(`Unrecognised widget effect: ${effect}`);
  break;
  }
  }
  