Middleware to tie Redux actions to the React user timing API

actionTimingMiddleware.js

export default () => (next) => (action) => {
  if (performance.mark === undefined) return next(action)
  performance.mark(`${action.type}_start`)
  const result = next(action)
  performance.mark(`${action.type}_end`)
  performance.measure(
    `${action.type}`,
    `${action.type}_start`,
    `${action.type}_end`
  )
  return result
}