v0.8.1
If you are running this tool locally on your disk, the current install now requires that you update to the latest LTS version of Node.js (v22.14.0).
It is recommended to follow the README.md instructions and reinstall the tool once you've updated Node.js.
Custom terrain type support has been added.
See, Using Custom Terrain Types in the README.md
Also see wiki document on creating custom terrains.