metamask-extension/ui/app/components/send_/send-content/send-amount-row/send-amount-row.selectors.js

const selectors = {
  getMaxModeOn,
  sendAmountIsInError,
}

module.exports = selectors

function getMaxModeOn (state) {
  return state.metamask.send.maxModeOn
}

function sendAmountIsInError (state) {
  return Boolean(state.send.errors.amount)
}