Prototype pollution vulnerability in stealjs steal 2.2.4 via the optionName variable in main.js.
https://github.com/stealjs/steal/issues/1533
https://github.com/stealjs/steal/blob/c9dd1eb19ed3f97aeb93cf9dcea5d68ad5d0ced9/main.js#L647
https://github.com/stealjs/steal/blob/c9dd1eb19ed3f97aeb93cf9dcea5d68ad5d0ced9/main.js#L2194