{{alias}}( fd, clbk )
    Asynchronously closes a file descriptor, so that the file descriptor no
    longer refers to any file and may be reused.

    Parameters
    ----------
    fd: integer
        File descriptor.

    clbk: Function
        Callback to invoke upon closing a file descriptor.

    Examples
    --------
    > function done( error ) {
    ...     if ( error ) {
    ...         console.error( error.message );
    ...     }
    ... };
    > var fd = {{alias:@stdlib/fs/open}}.sync( './beep/boop.js', 'r+' );
    > if ( !{{alias:@stdlib/assert/is-error}}( fd ) ) { {{alias}}( fd, done ); };


{{alias}}.sync( fd )
    Synchronously closes a file descriptor.

    Parameters
    ----------
    fd: integer
        File descriptor.

    Returns
    -------
    out: Error|void
        If an error occurs, an error object; otherwise, undefined.

    Examples
    --------
    > var fd = {{alias:@stdlib/fs/open}}.sync( './beep/boop.js', 'r+' );
    > if ( !{{alias:@stdlib/assert/is-error}}( fd ) ) { {{alias}}.sync( fd ); };

    See Also
    --------