Absinthe.GraphqlWS.Socket.__connect__

You're seeing just the function __connect__, go back to Absinthe.GraphqlWS.Socket module for more information.
Link to this function

__connect__(module, socket, options)

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Specs

__connect__(module(), map(), Keyword.t()) :: {:ok, socket()}

When a client connects to this websocket, this function is called to initialize the socket.