TypeScript Conditional Types for DispatchProp and RouteComponentProps

ReduxProps.ts

import { DispatchProp } from 'react-redux';
import IAction from './IAction';
import { RouteComponentProps } from 'react-router';

export type ReduxProps<P = any, R = never> = [R] extends [never]
  ? DispatchProp<IAction<P>>
  : DispatchProp<IAction<P>> & RouteComponentProps<R>;

ugly.ts

// Ugly alternative way
export type ReduxProps<P = any, R = never> = DispatchProp<IAction<P>> & ([R] extends [never] ? {} : RouteComponentProps<R>);