Nerves.Env.images_path

You're seeing just the function images_path, go back to Nerves.Env module for more information.
Link to this function

images_path(config \\ mix_config())

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Specs

images_path(keyword()) :: String.t()

The path to where firmware build files are stored This can be overridden in a Mix project by setting the :images_path key.

images_path: "/some/other/location"

Defaults to (build_path)/nerves/images