@babel/runtime-corejs2/helpers/esm/classPrivateFieldLooseBase.js

babel's modular runtime helpers with core-js@2 polyfilling

export default function _classPrivateFieldBase(receiver, privateKey) {
  if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) {
    throw new TypeError("attempted to use private field on non-instance");
  }
  return receiver;
}