This is a developer tool. It has no use for players, therefore it is intentionally missing from the list of plugins on Pulsar.
This client plugin dumps information on the replicated types in JSON format. This information is useful for porting the game on .NET 10 and related development tasks.
On starting the game a ReplicatedTypes.json file is produced inside a
ReplicatedTypes subdirectory inside the game's data folder.
It may differ depending on the game version, therefore a new dump has to be made at least after major game updates.