compression.darken_tiles(tiles, count): Darkens every tile in the tiles table count times.
compression.register_compressed_tiers(node): Registers compressed versions of the provided node; If the provided node has been compressed previously, groups.compressed must be set to however many times it has been compressed. (eg. moreblocks:cobble_compressed must have a groups.compressed value of 1.)
compression.register_compressed_nodes(nodes): Registers every node in the provided table. (eg. {"default:cobble", "default:desert_cobble"})
max_compression_level: The maximum compression tier; Default is 10.