$ show remy/jsconsole
jsconsole is a web-based JavaScript REPL and remote debugging tool. The frontend is a React (Preact-compat) single-page application with Redux state management, allowing users to type and execute JavaScript commands in a sandboxed iframe. Results are rendered with a rich type-aware display that supports expand/collapse for objects, arrays, functions, promises, and more. The backend is a Node.js/Express server that serves the static build and provides real-time communication via Server-Sent Events (SSE) for remote debugging sessions. Users can start a remote session (listen) to bridge console.log calls from another browser or device back to the main console, and also inject commands remotely. Architecturally, the codebase follows a standard client-server model with a React SPA. It makes clever use of AST parsing (via Babylon) in the `preProcess` function to handle JavaScript declarations (const/let) and async/await in the REPL, transforming input so that eval returns the final expression value. The backend uses a lightweight custom SSE session manager (`lib/es.js`) that could be extracted for other real-time projects. However, the project is technically very dated, with React 15, Webpack 2, and many other dependencies from 2017-2018. Despite this, the core REPL logic and type-rendering components are well-architected and could serve as a reference implementation for similar tools.
The LLM identified 2 files worth highlighting for reuse:
Contains the core REPL logic. The `preProcess` function uses Babylon to parse JavaScript input, then walks the AST to handle variable declarations (const/let/var), async/await, and expression statements. It rewrites the input so that the last expression is returned and stored in `$_`, enabling behavior similar to browser developer consoles. This function is self-contained, depends only on external libraries (babylon, babylon-walk), and could be extracted into a standalone npm package for building custom REPL environments.
A minimal but complete class for managing Server-Sent Events (SSE) connections per session ID. It handles adding/removing connections, sending data, and periodic pings to detect stale connections. The API is clean (add, send, locals, ping) and has no hard dependencies on the rest of the application. It could be reused directly in any Node.js project needing SSE-based real-time messaging with session isolation.