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onBlur, onFocus callback missing event
onBlur current has a single argument with the selected value, onBlur is commonly used to handle dirty tracking which requires a event (ex: formik, etc.). onFocus has a similar problem.
TreeSelect's onBlur and onFocus fire a React FocusEvent (React.FocusEventHandler<HTMLInputElement>) which allows you to grab the inputs reference
I think this has been fixed in the latest version. The argument for onFocus is an event now, however, there's no documentation about this change in antd's migration guide to v4.
@zachguo Yes