Node Emitter Details

Installation

> npm install node-emitter-details

Example

"use strict";

var util = require("util");
var getDetails = require("node-emitter-details");
var noop = function noop () {};
var put = function () {
  process.stdout.write.call(process.stdout, arguments[0]);
};

var e = new (require("events"))();
e.on("action", function onAction (){});
var d = getDetails(e, {excludeEvents: ["newListener", "removeListener"]});
e.emit("action", "apple", "kills", "aman");


put(util.inspect(d, {
      colors: true,
      depth: 4
    }));

Output:

API

When exp is:

  var exp = require("node-emitter-details");

exp(eventEmitter, [opts])

• eventEmitter, any instance of EventEmitter

• opts an options object where:

  • excludeEvents, is an array of events to disregard and not track

  • excludeHandlers, is an array of handlers to disregard and not track

  • saveInactiveEventDetails, is a boolean indicating if it should keep the memory of an EventDetails whose events have all been removed (inactive)

• returns an instance of EmitterDetails, see Emitter Details section.

exp.trackEvent(emitter, event)

• emitter, any instance of Event Emitter

• event, string name of event

• returns an instance of EventDetails (see Event Details) with the provided event registered to be tracked

Details Objects

Emitter Details

• emitter

  • The event emitter being tracked.

• events

  • Any or none instances of EventDetails

• emittedEvents

  • Any or none strings of events that have emitted.

• getEventNames()

  • returns an array of event names being tracked

• getEventDetails(eName)

  • eName, event name as a string

  • returns the EventDetails (see EventDetails) of the event or null

• excludeEvent(eName)

  • eName, event name as a string

  • excludes the event from being tracked

Event Details

• listeners

  • Array of arrays containing pairs of listener to HandlerDetails.

• timesEmitted

  • Number of times emitted

• dateCreated

  • instance of Date when the listener was added

• prevArgs

  • Copy of arguments the listeners are supplied with.

• name

• String of the event name.

• parent

  • Pointer to EmitterDetails that created it.

• getHandlerDetails(fn)

  • fn, event handler
  • returns instance of HandlerDetails (see Handler Details) of the handler details object that matches the provided function or null.

• getHandlers()

  • returns all the handlers listening for the event

• getHandlersDetails()

  • returns all the handler details corresponding to the event

• onUpdate(fn)

  • fn callback, called next time there is an change of properties. This happens when any of the events pertaining to the parent object are emitted. Event details instance is passed as the only arguments.

• excludeHandler(handler)

  • handler, function to exclude fro being tracked

Handler Details

• arity

  • Length of function signature (parameters).

• prevStackTrace

  • String of stack trace of last time it was called

• parent

  • Pointer to EventDetails that it belongs to.