An Event Emitter in Node.js is synchronous. When an event is emitted using the emit() method, all listeners registered for that event are called synchronously in the order in which they were registered[1][3][4][6][7]. This synchronous execution ensures the proper sequencing of events and helps avoid race conditions or logic errors[1][3].
However, while the initial calling of listeners is synchronous, Node.js provides options to defer actions to make parts of an event listener's response asynchronous. This can be achieved using setImmediate(), process.nextTick(), or other asynchronous APIs like setTimeout()[1][3][5]. These methods allow the event handling code to schedule asynchronous operations, which will be executed after the current call stack is cleared, thus not blocking the main thread immediately during their execution.
It's important to note that even though you can make the handling of events ...
