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Automate code & data workflows with interactive notebooks
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lib/livebook/runtime/evaluator/formatter.ex
defmodule Livebook.Runtime.Evaluator.Formatter do
@moduledoc false
# Behaviour defining how evaluation results are transformed.
#
# The evaluation result is sent to the client as a message and it
# may potentially be huge. If the client eventually converts the
# result into some smaller representation, we would unnecessarily
# send a lot of data. By defining a custom formatter the client can
# instruct the `Evaluator` to send already transformed data.
#
# Additionally, if the results rely on external package installed
# in the runtime node, then formatting anywhere else wouldn't be
# accurate, for example using `inspect` on an external struct.
alias Livebook.Runtime.Evaluator
@doc """
Transforms the evaluation result.
"""
@callback format_result(Evaluator.evaluation_result()) :: term()
end