index.js
function react(h) {
  var node = h && h('div')
  return Boolean(
    node && ('_owner' in node || '_store' in node) && node.key === null
  )
}
function react(h) {
  var node = h && h('div')
  return Boolean(
    node && ('_owner' in node || '_store' in node) && node.key === null
  )
}
function react ( h ) { var node = h && h ( 'div' ) return Boolean ( node && ( '_owner' in node || '_store' in node ) && node . key === null ) }
Check if `h` is `react.createElement`.
Check if h is react . createElement .