meteor__authdemo/client/admin.js

Meteor.loginAsAdmin = function (password, callback) {
  // Create a login request with admin:true, so our loginHandler can handle it.
  let loginRequest = { admin: true, password: password };
  // Send the login request.
  Accounts.callLoginMethod({
    methodArguments: [loginRequest],
    userCallback: callback
  });
};