eslint-config-airbnb-standard/node_modules/@babel/runtime/helpers/esm/classPrivateFieldLooseBase.js

Airbnb's JS ESLint config + JS Standard Style + semicolons

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;
}