33 function cursorTo(stream, x, y, callback) {  argument
34   if (callback !== undefined) {
35     validateFunction(callback, 'callback');
39     callback = y;
47     if (typeof callback === 'function') process.nextTick(callback, null);
54   return stream.write(data, callback);
61 function moveCursor(stream, dx, dy, callback) {  argument
62   if (callback !== undefined) {
63     validateFunction(callback, 'callback');
67     if (typeof callback === 'function') process.nextTick(callback, null);
85   return stream.write(data, callback);
95 function clearLine(stream, dir, callback) {  argument
96   if (callback !== undefined) {
97     validateFunction(callback, 'callback');
101     if (typeof callback === 'function') process.nextTick(callback, null);
107   return stream.write(type, callback);
114 function clearScreenDown(stream, callback) {  argument
115   if (callback !== undefined) {
116     validateFunction(callback, 'callback');
120     if (typeof callback === 'function') process.nextTick(callback, null);
124   return stream.write(kClearScreenDown, callback);