Absinthe.GraphqlWS.Transport.handle_message

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

handle_message(msg, socket)

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Specs

Callbacks for parsed JSON payloads coming in from a client.

See: https://github.com/enisdenjo/graphql-ws/blob/master/PROTOCOL.md