This project is unmaintained, so it WILL DEFINENTLY CORRUPT YOUR WORLDS.
Thanos is NodeJS port of eponymous PHP library, but unlike mentioned library - it removes unused chunks in-place, without need to copy any files. It also can reduce file size of a Minecraft world by more than 50%.
This library also do use inhabited time instead of blocklists, chunks generated by software that doesn't support that (like flying-squid server) will be ignored.
Currently, only the Minecraft Anvil world format (Java Edition) is supported.
Usage: cli.js [path]
Options:
--help Show help [boolean]
--version Show version number [boolean]
-i, --inhabitedtime Minimum InhabitedTime for chunk to be
keeped, in ticks [number] [default: 0]
--keepbackups, --bak Keep backups of modified regions as .bak files
[boolean] [default: true]
To disable backups, add --no-keepbackups or --no-bak option
See index.d.ts file for class description