Toast.tsx

import React, { Component } from 'react'

enum ToastSize {
  SMALL,
  MEDIUM,
  LARGE
}

enum ToastType {
  INFO,
  SUCCESS,
  ERROR,
  WARN
}

namespace Toast {
  export type Size = ToastSize
  export type Type = ToastType

  export interface Props {
    size: Toast.Size
    type: Toast.Type
  }
}

class Toast extends Component<Toast.Props>{
  static Size = ToastSize
  static Type = ToastType
  
  render() {
     // ...
  }
}

export default Toast