Figlet.Parser.HeaderlineParser.parse

You're seeing just the function parse, go back to Figlet.Parser.HeaderlineParser module for more information.
Link to this function

parse(header_line, opts \\ [])

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Specs

parse(header_line :: binary(), opts :: keyword()) ::
  {:ok, Figlet.Meta.t()} | {:error, binary()}

Parses the headerline (provided as a string binary).