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npm install fastify-socket.io     
fastify-socket.io enables the use of Socket.io in a Fastify application.
Supports Fastify versions 4.x
Supports socket.io version 4.x
``
npm i fastify-socket.io socket.io
Require fastify-socket.io and register it as any other plugin, it will add a io decorator.
`js
const fastify = require("fastify")();
fastify.register(require("fastify-socket.io"), {
// put your options here
});
fastify.get("/", (req, reply) => {
fastify.io.emit("hello");
});
fastify.listen({ port: 3000 });
`
For more details see examples
You can use it as is without passing any option, or you can configure it as explained by Socket.io doc.
By default the plugin will add a preClose hook that disconnects all the local sockets in order to close correctly the fastify server. In order to change this behaviour you can use preClose option:
`javascript`
await fastify.register(require('fastify-socket.io'), {
preClose: (done) => {
// do other things
fastify.io.local.disconnectSockets(true);
done();
}
})
The plugin also adds an onClose hook which closes the socket server when the fastify instance is closed.
The io decorator is NOT typed.
This is necessary to allow, eventually, the developer to be able to define custom types and make use of the socket.io new types system (doc).
For more info see the example
The code is a port for Fastify of socket.io.
Licensed under MIT.
socket.io` license