The Shader Graph package adds a visual Shader editing tool to Unity. You can use this tool to create Shaders in a visual way instead of writing code. Specific render pipelines can implement specific graph features. Currently, both the High Definition Rendering Pipeline and the Universal Rendering Pipeline support Shader Graph.
These package versions are safe to use with Unity version 2019.4:
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Package version 7.3.1 is verified to work with 2019.4.