javascript - Can't get token.remove() working in Facebook Emitter -

any idea why facebook emitter not working token.remove() call below:

console:

$ node main.js 5 10 /users/carlf/documents/dev/test/emitter/emit-node.js:21 token.remove();       ^ typeerror: undefined not function 

my code:

var {eventemitter} = require('./node_modules/emitter'); var emitter = new eventemitter();  var token = emitter.addlistener('event', function(x, y) { console.log(x, y); });  emitter.emit('event', 5, 10);  // listener prints "5 10".  token.remove(); emitter.emit('event', 9, 11); // nothing logged 

that error telling remove not function. remove listener need call removelistener method of instance of eventemitter passing name of event , callback provided. try this:

var {eventemitter} = require('./node_modules/emitter'); var emitter = new eventemitter();  function handler(x, y) {   console.log(x,y); }  emitter.addlistener('event', handler);  emitter.emit('event', 5, 10);  // listener prints "5 10".  emitter.removelistener('event', handler);  emitter.emit('event', 9, 11); // nothing logged