deep-dive

Signal SignalKit Telegram iOS: How the App Implements Reactive Programming with SwiftSignalKit

April 7, 2026 TelegramMessenger/Telegram-iOS ↗

Telegram iOS uses the SwiftSignalKit library (Signal Kit) to implement a cold-observable reactive pattern, where asynchronous data streams represented by Signal<T, E> remain inactive until subscribed to, enabling deferred execution of network and UI operations.

The TelegramMessenger/Telegram-iOS repository builds its entire asynchronous architecture on a custom reactive framework called SwiftSignalKit. Unlike mainstream alternatives such as RxSwift or Combine, this library prioritizes minimal binary size while providing composable primitives for handling complex data flows across messaging, network updates

Have a question about this repo?

These articles cover the highlights, but your codebase questions are specific. Give your agent direct access to the source. Share this with your agent to get started:

Share the following with your agent to get started:

curl -s "https://instagit.com/install.md"

Add to your MCP client configuration:

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}

Ask your agent:

"Use Instagit MCP to understand how TelegramMessenger/Telegram-iOS works."

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