oidc-provider/lib/helpers/resolve_response_mode.js

OAuth 2.0 Authorization Server implementation for Node.js with OpenID Connect

export default function resolve(responseType) {
  return typeof responseType === 'string' && responseType.includes('token') ? 'fragment' : 'query';
}

export function isFrontChannel(responseType) {
  return resolve(responseType) === 'fragment';
}