libraryPath property
Central directory path for per-package bridge files.
When specified, the generator will create one file per source package
in this directory (e.g., lib/src/d4rt_bridges/package_tom_basics_bridges.b.dart).
The per-barrel bridge files will then delegate to these per-package files,
eliminating duplicate code when the same package is re-exported by multiple barrels.
Implementation
final String? libraryPath;