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constenergy=require("energy")constemitter=energy()

Or usenew if you prefer. Either way works :)

constenergy=require("energy")constemitter=newenergy

• emitter.on(event, listener)
• emitter.off(event?, listener?, quota?)
• emitter.emit(event, ...args)
• emitter.once(event, listener)
• emitter.clone()
• emitter.listeners(event)
• emitter.init()
• emitter.to(target)
• energy.to(target)

• emitter refers to anenergy() object
• event refers to an event name
• listener refers to a function that listens to an event

• Addlistener forevent
• @return emitter

• Remove listener(s)
  • .off() removes all listeners for all events
  • .off(event) removes allevent listeners
  • .off(event, listener) removes all occurrences ofeventlistener
  • .off(event, listener, quota) removequota occurrences ofeventlistener
• @return emitter

• Fireevent listeners (in sequence) with the supplied arguments
• Listeners run in the context ofemitter
• @return number of invoked listeners

• Add a one-timeeventlistener
• @returnemitter

• Clone an emitter at its current state
• @return a new emitter

• Access the listeners array for the specifiedevent
• @return array (reference)

• Reinitialize an emitter
• @returnemitter

• Maketargetemitter-like based onemitter as the source.
• @returnemitter

• Maketarget emitter-like based on aenergy() object as the source
• @returntarget with emitter methods and properties

Works innodeand in any browser. Tested in node, Chrome, FF, Opera, IE8