Expose is a command-line tunneling tool written in PHP using the Laravel Zero micro-framework and ReactPHP for asynchronous networking. It acts as an ngrok alternative, allowing developers to expose local HTTP servers and TCP ports to the public internet via a remote server. The application includes a CLI client for sharing sites, a local web dashboard (port 4040) for inspecting requests/responses, and a plugin system for analyzing webhook payloads (e.g., GitHub, Stripe, Paddle). The architecture is a monolith structured around a ReactPHP event loop: the client establishes a WebSocket control connection to the Expose server, authenticates, then creates proxy connections that forward incoming HTTP requests from the server to the local application. The local dashboard is served by an embedded HTTP server and uses a Vue 3 frontend with real-time WebSocket updates. The codebase demonstrates strong craftsmanship in areas like the plugin system, magic authentication flow, and custom terminal output handling, though some components are tightly coupled and the dependency on forked ReactPHP packages introduces moderate technical drift.