socket_io_lite 0.1.0

Lightweight, zero-dependency Socket.IO client for Dart & Flutter.

0.1.0

Initial release.

• Zero-dependency Socket.IO client for Dart & Flutter (Engine.IO v4 / Socket.IO v4).
• Native WebSocket transport (dart:io) with automatic heartbeat (server ping / client pong) and a missed-heartbeat watchdog.
• SocketIoLite.connect, on, off, emit, onConnect, onDisconnect, onError, disconnect, and dispose.
• Namespaces, connection auth payload, query params, and pre-connect emit buffering.
• Acknowledgements: emitWithAck with optional ackTimeout.
• Automatic reconnection with exponential backoff (reconnection, reconnectionAttempts, reconnectionDelay, reconnectionDelayMax) and onReconnect / onReconnectAttempt / onReconnectFailed.
• Event helpers: once, onAny / offAny, and onAck / offAck (respond to server events that expect an acknowledgement).
• Multiplexed namespaces: socket.of('/ns') shares a single WebSocket across namespaces (Manager + Socket architecture), each with its own CONNECT, listeners, and acks.
• Variadic emit: emit(event, arg1, arg2, ...) and the same for emitWithAck, matching Socket.IO's multi-argument events (e.g. WebRTC signaling). Incoming multi-argument events are delivered to handlers as a List. An explicitly passed null is now sent as an argument (previously omitted).
• Web support via dart:html WebSocket, selected automatically through a conditional import — one API across native, web, and desktop. The web build compiles and shares the same protocol layer that is tested on the VM.
• Verified end-to-end against a real socket.io v4 server on both native and web (browser) transports.

Note: web uses dart:html, which compiles with the standard JS web build; the Wasm build (--wasm) is not supported yet.