set_and_assert_arg_filetype

Sets and asserts the file type argument to a standard format for further internal
processing.

internal

Pretty-prints R code without changing the user's formatting
intent.

<dl><dt>filetype</dt>
<dd>A character vector with file types to convert to the internal
standard format.</dd></dl>

<dl>

<dt>filetype</dt>
<dd>A character vector with file types to convert to the internal
standard format.</dd>

</dl>