batch-byte-recompile-directory is an autoloaded compiled Lisp function in `bytecomp.el'.

(batch-byte-recompile-directory &optional ARG)

Run `byte-recompile-directory' on the dirs remaining on the command line.
Must be used only with `-batch', and kills Emacs on completion.
For example, invoke `emacs -batch -f batch-byte-recompile-directory .'.

Optional argument ARG is passed as second argument ARG to
`byte-recompile-directory'; see there for its possible values
and corresponding effects.