> The new module system is already incompatible with pre-2018 edition projects Code written for the 2015 edition should generally just work with the 2018 editi

> The new module system is already incompatible with pre-2018 edition projects Code written for the 2015 edition should generally just work with the 2018 edition module system. That's part of what we worked to ensure, and that's why we didn't mix in changes that might have reduced that compatibility.