React + Vite in 2025: Our Choice for Enterprise AI Interfaces
Building an interface for a RAG system isn't like making an e-commerce. You need real-time streaming, heavy document handling, and an experience that doesn't make users miss ChatGPT. Here's how React and Vite let us do it.
Why React and Not Vue, Svelte or Angular
We like Svelte. We respect Vue. We know Angular well. But when you need to build an enterprise AI interface with streaming chat, document uploads, inline PDF preview and analytics dashboards — React remains the most pragmatic choice in 2025. The reason isn't strictly technical. It's ecosystemic. When we needed a performant PDF viewer component, we found it in React (react-pdf). When we needed drag-and-drop for document reordering, there was dnd-kit. Every puzzle piece already exists, is actively maintained, and has thousands of GitHub stars. According to State of JS 2024, React has 39% market share among frontend frameworks — more than Vue (18%) and Angular (17%) combined.
Vite Killed Webpack (And We Don't Miss It)
Our old setup with Create React App and Webpack was a nightmare: 45 seconds to start the dev server, 8 seconds for every hot reload, and production builds taking 3+ minutes. With Vite we went to: 800ms for the dev server, instant hot reload, production builds in 12 seconds. The difference is so drastic it changed how we develop. Before, a CSS change required an 8-second mental coffee break. Now you change, see, iterate. The feedback cycle is immediate. Vite 7 with the new Rolldown bundler (Rust-based) further improved production builds. Our RAG Enterprise PRO Frontend bundle weighs 340 KiB gzipped with automatic code splitting. Two years ago with Webpack it was 520 KiB.
AI Streaming in React: The Real Challenge
The most complex part of our frontend isn't the layout or components — it's streaming AI responses. When a user asks a question, the answer arrives token by token from the LLM via Server-Sent Events. Displaying this stream smoothly, with real-time markdown rendering and code syntax highlighting, was a real challenge. We used React 19 with useDeferredValue to prevent token rendering from blocking the interface. Text arrives at 30-50 tokens per second and each token triggers a re-render. Without optimization, the UI became janky. With useDeferredValue + memo on markdown components, the perception is total fluidity. A trick that saved us: we virtualize the chat history. When a conversation has more than 50 messages, those outside the viewport aren't rendered. The user notices nothing, but the browser is grateful.
TypeScript: Not Optional, a Requirement
All our React code is in TypeScript strict mode. It's not an aesthetic preference — it's a necessity when working with APIs that return complex data structures like documents with metadata, search results with scores and sources, and AI responses with citations. Our project has about 15,000 lines of TypeScript and zero any. Every type is explicit. Did it cost us time? Yes, about 15% more in initial development. Did it pay off? Absolutely — production bugs related to wrong data types have been literally zero since we adopted strict mode.
FAQ About React for Enterprise
Q: Is React still the right choice in 2025 with Svelte and Solid growing? A: For enterprise, yes. React's library and component ecosystem is unmatched. Svelte and Solid are great for smaller projects. Q: Do you need Next.js for an enterprise React application? A: It depends. For our case (SPA with separate API backend), Vite is the better choice. Next.js makes sense if you need SSR for SEO or integrated API routes. Q: How do you manage state in a complex React app? A: We use TanStack Query for server state (cache, refetch, optimistic updates) and Zustand for local client state. We abandoned Redux two years ago — too much boilerplate for the value it provides.
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