# All files / Transition Transition.tsx

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     import * as React from 'react'
    import classNames from 'classnames'
    import { CSSTransition } from 'react-transition-group'
    import { styles } from './Transition.styled'
    import { TransitionClassProps, TransitionProps, TransitionPropTypes } from './Transition.type'
    import { createUseStyles } from '@fluent-ui/styles'
    import { omit } from '../utils'

    export const name = 'Transition'

    const useStyles = createUseStyles<TransitionClassProps>(styles, { name })

    const Transition: React.FC<TransitionProps> = React.forwardRef<HTMLDivElement, TransitionProps>(
      (props, ref): React.ReactElement => {
        const {
          type = 'fade',
          wrapper = true,
          appear = true,
          timeout = 250,
          visible,
          children,
          ...rest
        } = props

        const otherProps = omit(rest, ['custom'])

        const [wrapperHeight, setWrapperHeight] = React.useState(0)
        const wrapperRef = React.useRef<HTMLDivElement>(null)
        React.useEffect((): void => {
          if (wrapperRef && wrapperRef.current && wrapperRef.current.clientHeight) {
            setWrapperHeight(wrapperRef.current.clientHeight)
          }
        }, [])
        const classes = useStyles({
          wrapperHeight,
          ...props
        })
        const className = classNames(classes.root, {
          [classes.fade]: type === 'fade',
          [classes.zoom]: type === 'zoom',
          [classes.slide]: type === 'slide',
          [classes.collapse]: type === 'collapse',
          [classes.grow]: type === 'grow'
        })
        return (
          <CSSTransition
            in={visible}
            appear={appear}
            timeout={timeout}
            classNames={type}
            {...otherProps}
          >
            {wrapper ? (
              <div className={className} {...otherProps} ref={ref}>
                <div ref={wrapperRef}>{children}</div>
              </div>
            ) : (
              React.cloneElement(children, {
                ...otherProps,
                className: classNames(children.props.className, className)
              })
            )}
          </CSSTransition>
        )
      }
    )

    Transition.displayName = `F${name}`

    Transition.propTypes = TransitionPropTypes

    Transition.defaultProps = {
      type: 'fade',
      wrapper: true,
      appear: true,
      timeout: 250
    }

    export default Transition