eventsource-polyfill

What is eventsource-polyfill?

The eventsource-polyfill npm package provides a polyfill for the EventSource API, which is used for receiving server-sent events (SSE). This is particularly useful for environments that do not natively support EventSource, such as older browsers.

What are eventsource-polyfill's main functionalities?

Basic EventSource Connection

This feature allows you to establish a basic connection to a server that sends events. The code sample demonstrates how to create an EventSource instance and handle incoming messages.

const EventSource = require('eventsource-polyfill');
const es = new EventSource('http://example.com/events');
es.onmessage = function(event) {
  console.log('New message:', event.data);
};

Handling Different Event Types

This feature allows you to listen for specific types of events sent by the server. The code sample shows how to add an event listener for a custom event type.

const EventSource = require('eventsource-polyfill');
const es = new EventSource('http://example.com/events');
es.addEventListener('customEvent', function(event) {
  console.log('Custom event received:', event.data);
});

Error Handling

This feature provides a way to handle errors that may occur during the connection. The code sample demonstrates how to set up an error handler.

const EventSource = require('eventsource-polyfill');
const es = new EventSource('http://example.com/events');
es.onerror = function(event) {
  console.error('Error occurred:', event);
};

Other packages similar to eventsource-polyfill

eventsource

The eventsource package is a robust implementation of the EventSource API for Node.js. It provides similar functionalities to eventsource-polyfill but is specifically designed for server-side use in Node.js environments.

sse

The sse package is another implementation of server-sent events for Node.js. It offers a simple API for creating and managing SSE connections, similar to eventsource-polyfill, but is more focused on server-side applications.

README

The README file is missing