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I would like to use socket.io in my Typescript project, but I've only found .d.ts files for server-side typescript.
This is a nice example: https://github.com/soywiz/typescript-node-definitions/blob/master/socket.io.d.ts
It shows how to use TypeScript in combination with Socket.io. However on the client side it uses JavaScript.
What I need is a .d.ts file for client-side TypeScript, that resolves the error message from this line:
var socket=io.connect("localhost");
The name "io" does not exist in the current scope
Where can I find the appropriate definition file?
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Key Differences between WebSocket and socket.ioIt provides the Connection over TCP, while Socket.io is a library to abstract the WebSocket connections. WebSocket doesn't have fallback options, while Socket.io supports fallback. WebSocket is the technology, while Socket.io is a library for WebSockets.
Socket.IO is way more than just a layer above WebSockets, it has different semantics (marks messages with name), and does failovers to different protocols, as well has heartbeating mechanism. More to that attaches ID's to clients on server side, and more. So it is not just a wrapper, it is full-featured library.
Socket.IO is a library that enables low-latency, bidirectional and event-based communication between a client and a server. It is built on top of the WebSocket protocol and provides additional guarantees like fallback to HTTP long-polling or automatic reconnection.
There is @types/socket.io now, just install it by running:
npm i --save @types/socket.io
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