This bug was introduced by the transition to full es modules (I think).
The solution is to manually (conditionally) create the protomapsL global before importing the pmtilesRules for a layer, which currently sometimes fails, because for example simply designating a theme does not avail itself of the protomapsL variable symbols, but creating custom symbolizers does indeed rely on those exports.
Needs a test, which means it needs some spearfish mvt files save to test/data to test with.
This bug was introduced by the transition to full es modules (I think).
The solution is to manually (conditionally) create the protomapsL global before importing the pmtilesRules for a layer, which currently sometimes fails, because for example simply designating a theme does not avail itself of the protomapsL variable symbols, but creating custom symbolizers does indeed rely on those exports.
Needs a test, which means it needs some spearfish mvt files save to test/data to test with.