Using an uncontrolled environment to declare the state of your tree is mostly documented in the Get Started document. You need to declare your data by implementing a TreeDataProvider that declares how tree items can be loaded by React Complex Tree. Alternatively, you can just provide a StaticTreeDataProvider that contains a static reference to all available data.
You can read more about implementing a custom TreeDataProvider implementing a custom TreeDataProvider here.
An example using a StaticTreeDataProvider looks like this:
The props for the
UncontrolledTreeEnvironment are as follows: