What happens to Node.js events?

Question

I have an Express application that uses an event emitter when resolving requests on a specific route. When the request is received, emit is called, which runs the code in the handler. This code takes about 5 seconds. What happens when an Express endpoint receives 10 or more requests per second at a time?

Will events be pushed onto the call stack and completed in the order in which they are pushed onto the call stack?

thank

status.emit('newCompletion')

Answer 1

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, .emit() , :

let em = new EventEmitter();
em.on("hello", function() {
    console.log("hello");
});


// schedule "immediate" task
setTimeout(function() {
    console.log("timer");
}, 0)

// schedule "immediate" micro-task
Promise.resolve().then(function() {
    console.log("promise");
});

em.emit("hello");
console.log("ready");

<script src="https://cdnjs.cloudflare.com/ajax/libs/EventEmitter/5.2.2/EventEmitter.js"></script>

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