React event emitter

js file inside your source code directory according to the following steps:

Event Emitter is useful library in React apps – on, adds listener and start listening on specific events , – once, like above but after first event occurence is removing, – off, removes listener for specific event type, – emit, invokes event and can add payload when is needed.

Device event emitters in general are simple event handlers that takes an event name and a function as an arguments and waits until an emit method is called to perform the action.