usedComponentNames function

Set<String> usedComponentNames(Recordings? recordings, List<Map<String, Object?>> components)

Names of the components to keep, per the recorded usages.

Null recordings (the toolchain recorded nothing) keeps everything. So does a recording that references none of the generated _new externs: an app that uses no component at all would not depend on this package, so that pattern means the recording missed the FFI tear-offs — dropping every component on that evidence would break the app.

Implementation

Set<String> usedComponentNames(
  Recordings? recordings,
  List<Map<String, Object?>> components,
) {
  final all = {for (final c in components) c['name'] as String};
  if (recordings == null) return all;
  final referenced = {
    for (final d in recordings.calls.keys) '${d.library.uri}#${d.name}',
  };
  final used = {
    for (final c in components)
      if (referenced.contains('${c['library']}#${c['newExtern']}'))
        c['name'] as String,
  };
  return used.isEmpty ? all : used;
}