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Automate code & data workflows with interactive notebooks
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lib/livebook/evaluator/formatter.ex
defmodule Livebook.Evaluator.Formatter do
@moduledoc false
# Behaviour defining how evaluation results are transformed.
#
# The evaluation response 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.Evaluator
@doc """
Transforms the evaluation response.
"""
@callback format_response(Evaluator.evaluation_response()) :: term()
end