Meeseeks.Document.fetch_node

You're seeing just the function fetch_node, go back to Meeseeks.Document module for more information.
Link to this function

fetch_node(document, node_id)

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Specs

fetch_node(t(), node_id()) :: {:ok, node_t()} | {:error, Meeseeks.Error.t()}

Returns a tuple of {:ok, node}, where node is the node referred to by node_id in the context of the document, or :error.