@spec new_tempfile_path(file_extension :: binary()) :: binary()

Returns a randomly-named path in the system temp directory. Does not actually create the file at the path.

For example, Moar.File.new_tempfile_path(".txt") would return something like "/var/folders/3r/n09zyyy16yddj9m2d1ppzvt40000gn/T/XY7V5E26DV.txt".

iex> Moar.File.new_tempfile_path(".txt") |> File.exists?()
false

@spec write_tempfile(contents :: iodata(), file_extension :: binary()) :: binary()

Writes contents to a new temp file with extension file_extension, and returns the path to the file.

For example, Moar.File.write_tempfile("hello", ".txt") would create a file in a path something like /var/folders/3r/n09zyyy16yddj9m2d1ppzvt40000gn/T/RHUEJCCH22.txt with the contents hello.

iex> Moar.File.write_tempfile("hello", ".txt") |> File.read!()
"hello"