setup-node/node_modules/@octokit/rest/plugins/authentication/validate.js

module.exports = validateAuth;

function validateAuth(auth) {
  if (typeof auth === "string") {
    return;
  }

  if (typeof auth === "function") {
    return;
  }

  if (auth.username && auth.password) {
    return;
  }

  if (auth.clientId && auth.clientSecret) {
    return;
  }

  throw new Error(`Invalid "auth" option: ${JSON.stringify(auth)}`);
}