backend/util.js

function backendState(backend) {
  if (backend.frozen) {
    throw new Error(
      'Attempting to use an outdated Automerge document that has already been updated. ' +
      'Please use the latest document state, or call Automerge.clone() if you really ' +
      'need to use this old document state.'
    )
  }
  return backend.state
}

module.exports = {
  backendState
}