@spec to_livebook(t()) :: map()

Transforms the given value into a Livebook-compatible output.

For detailed description of the output format see t:Livebook.Runtime.output/0.

When implementing the protocol for custom struct, you generally do not need to worry about the output format. Instead, you can compose built-in kinos and call Kino.Render.to_livebook/1 to get the expected representation.

For example, if we wanted to render a custom struct as a mermaid graph, we could do this:

defimpl Kino.Render, for: Graph do
  def to_livebook(graph) do
    source = Graph.to_mermaid(graph)
    mermaid_kino = Kino.Mermaid.new(source)
    Kino.Render.to_livebook(mermaid_kino)
  end
end

In many cases it is useful to show the default inspect representation alongside our custom visual representation. For this, we can use tabs:

defimpl Kino.Render, for: Graph do
  def to_livebook(graph) do
    source = Graph.to_mermaid(graph)
    mermaid_kino = Kino.Mermaid.new(source)
    inspect_kino = Kino.Inspect.new(graph)
    kino = Kino.Layout.tabs(Graph: mermaid_kino, Raw: inspect_kino)
    Kino.Render.to_livebook(kino)
  end
end