Attempting to use the optional chaining operator (introduced 2020) in#7474 raised an error when runningnpm run build:

This seems to be becausefalafel (used in one of the preprocessing steps) depends on an older version of theacorn parser (7.4.1, released 5 years ago).

Adding an override topackage.json to bump theacorn version allows the build to complete successfully.

"overrides": {"falafel": {"acorn":"^8.1.1"    }