interface Prop { transitionEnter?: boolean; transitionAppear?: boolean; transitionLeave?: boolean; [key: string]: any; } declare const util: { isAppearSupported(props: Prop): any; isEnterSupported(props: Prop): any; isLeaveSupported(props: Prop): any; allowAppearCallback(props: Prop): any; allowEnterCallback(props: Prop): any; allowLeaveCallback(props: Prop): any; }; export default util;