Derive the union of index token names from a values-first config literal.
When CF carries an indexes object with preserved literal keys (prefer as const), this helper captures the index token union. Falls back to string if absent.
indexes
as const
string
Derive the union of index token names from a values-first config literal.
When CF carries an
indexesobject with preserved literal keys (preferas const), this helper captures the index token union. Falls back tostringif absent.