Solid is a declarative JavaScript library for building user interfaces that prioritizes performance through fine-grained reactivity rather than virtual DOM reconciliation. Written in TypeScript, it compiles JSX templates directly to real DOM nodes and updates them with surgical precision when state changes, ensuring that only code depending on modified state reruns. The library uses reactive primitives like createSignal to track dependencies automatically, allowing developers to declare state once and use it throughout their application with minimal rerendering overhead.
The core architectural approach treats components as regular JavaScript functions that execute once to set up the view, establishing what the documentation calls a render-once mental model. This contrasts with frameworks that rerender components on state changes. Solid achieves this through compile-time optimization of JSX and runtime dependency tracking, resulting in performance metrics that approach hand-optimized vanilla JavaScript according to the JS Framework Benchmark. The library is notably small and fully tree-shakable, with server-side rendering performance that matches its client-side efficiency.
Solid provides a comprehensive feature set for modern application development, including built-in state management through Context and Stores, eliminating the need for external state libraries in many cases. The framework supports Resources for server-loaded data, Suspense for asynchronous operations, concurrent rendering, streaming server-side rendering, progressive hydration, Error Boundaries, and custom element authoring. It integrates with established tooling like JSX, TypeScript, and the Vite ecosystem, while remaining unopinionated about code organization and encouraging patterns like declarative code and read-write segregation.
The repository shows active maintenance and community engagement.
Solid's design philosophy emphasizes pragmatism and productivity. Components are plain JavaScript functions with no hidden rendering rules, allowing developers to organize code freely and leverage native JavaScript libraries like D3 directly. The framework supports isomorphic rendering across client and server environments, with progressive hydration enabling faster time-to-interactive. The ecosystem is expanding with community-contributed primitives, component libraries like Kobalte, and build-time utilities that extend Solid's capabilities.
Browser support covers the last two years of modern browsers including Firefox, Safari, Chrome, and Edge on desktop and mobile, while explicitly excluding Internet Explorer. Server environments support Node LTS, Deno, and Cloudflare Workers. The project maintains an active Discord community where the creator and core team engage directly with users, and accepts donations through Open Collective to sustain development activities.
