rn.js

// rn.js
import {createElement} from 'react'
import {View, Text, Image} from 'react-native'

const map = { view: View, text: Text, image: Image }

export default function rn(type, props, ...children){
  return createElement(map[type] || type, props, ...children)
}

// app.js 

// @jsx rn
import rn from './rn'

// ...
  <view>
    <text> what up </text>
    <image source={}/>
      // ...