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parse(contents, vars, opts)

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parse(contents :: binary(), vars :: map(), opts :: keyword()) ::
  {:ok, map()} | {:error, any()}

A parser implementation should receive the contents read from a file, a map of vars (with string keys, as would come from System.get_env/0), and a keyword list of opts.

This callback is provided to help facilitate testing. See Dotenvy.Parser for the default implementation.