in apps/mountebank-mock/mountebank-source/src/models/responseResolver.js [320:327]
function hasMultipleTypes (responseConfig) {
return (responseConfig.is && responseConfig.proxy) ||
(responseConfig.is && responseConfig.inject) ||
(responseConfig.proxy && responseConfig.inject) ||
(responseConfig.fault && responseConfig.proxy) ||
(responseConfig.fault && responseConfig.is) ||
(responseConfig.fault && responseConfig.inject);
}