alias node="env NODE_NO_READLINE=1 rlwrap node"
-### repl.start(prompt='> ', stream=process.stdin, eval=eval, useGlobal=false)
+### repl.start(prompt='> ', stream=process.stdin, eval=eval, useGlobal=false, ignoreUndefined=false)
Starts a REPL with `prompt` as the prompt and `stream` for all I/O. `prompt`
is optional and defaults to `> `. `stream` is optional and defaults to
If `useGlobal` is set to true, then the repl will use the global object,
instead of running scripts in a separate context.
+If `ignoreUndefined` is set to true, then the repl will not output return value
+of command if it's `undefined`.
+
You can use your own `eval` function if it has following signature:
function eval(cmd, callback) {
// Two eval modes are available: controlEval and debugEval
// But controlEval is used by default
this.repl = new repl.REPLServer('debug> ', streams,
- this.controlEval.bind(this));
+ this.controlEval.bind(this), false, true);
// Kill child process when repl closed or main process is dead
this.repl.rli.addListener('close', function() {
exports.writer = util.inspect;
-function REPLServer(prompt, stream, eval, useGlobal) {
+function REPLServer(prompt, stream, eval, useGlobal, ignoreUndefined) {
var self = this;
self.useGlobal = useGlobal;
self.bufferedCommand = '';
// If we got any output - print it (if no error)
- if (!e) {
+ if (!e && (!ignoreUndefined || ret !== undefined)) {
self.context._ = ret;
self.outputStream.write(exports.writer(ret) + '\n');
}