Function onBlurHandler

packages/react-aria/src/interactions/utils.ts:74–88

        let target = eventTarget;
        let onBlurHandler: EventListenerOrEventListenerObject | null = e => {
          stateRef.current.isFocused = false;

          if (target.disabled) {
            // For backward compatibility, dispatch a (fake) React synthetic event.
            let event = createSyntheticEvent<ReactFocusEvent<Target>>(e);
            onBlur?.(event);
          }

          // We no longer need the MutationObserver once the target is blurred.
          if (stateRef.current.observer) {
            stateRef.current.observer.disconnect();
            stateRef.current.observer = null;
          }
        };

        target.addEventListener('focusout', onBlurHandler, {once: true});