personae/server/utils/injectTypename.js

export default function injectTypename(typename) {
  function typenameMutator(_typename, _rawResult) {
    if (_isPlainObject(_rawResult) && _has(_rawResult, "id")) {
      _set(_rawResult, "__typename", _typename)
    } else if (_isArray(_rawResult)) {
      _forEach(_rawResult, (entry) => _set(entry, "__typename", _typename))
    }

    return _rawResult
  }

  return (rawResult) => typenameMutator(typename, rawResult)
}