Tauri File-Watching for CLI-to-GUI Event Streaming

Problem

When building a Tauri desktop app that needs to display real-time updates from a CLI tool or external process, you need a way to bridge the output from the CLI (which writes to files or stdout) to the GUI frontend.

Context / Trigger Conditions

• Building a Tauri app with a React/TypeScript frontend
• Have a separate CLI tool that writes events/logs to a JSONL file
• Need real-time updates in the GUI when the CLI produces new output
• Want to show agent/process status, activity logs, or progress in the GUI

Solution

1. Define Event Types in Tauri Backend (Rust)