Custom deck.gl layers are available in pydeck, loaded dynamically.
Layers are loaded dynamically by the frontend, when the output from :meth:`pydeck.bindings.deck.Deck.show` or :meth:`pydeck.bindings.deck.Deck.to_html` is called and loaded.
Custom layers must subclass deck.gl's Layer or CompositeLayer classes. They must also include deck.gl and @deck.gl/layers as external libraries in the webpack config. You can see this repo for a minimal example.
Code for usage of that example layer can be seen here:
.. literalinclude:: ../examples/custom_layer.py :language: python
