FAST is a web component library and design system framework that enables developers to build reusable UI components based on W3C Web Component standards.
FAST addresses the challenge of creating performant, standards-compliant components that work across frameworks and browsers. The core approach centers on @microsoft/fast-element, a lightweight library for building Web Components that are memory-efficient and compatible with any front-end framework or build system. This allows incremental adoption without requiring rewrites of existing code. The project also provides @fluentui/web-components, a ready-made component library built on the Fluent design language using the same foundation.
Developers should choose FAST if they need Web Components that integrate seamlessly with existing systems regardless of framework choice. It suits projects ranging from those wanting pre-built Fluent-designed components to teams building custom component libraries. The framework-agnostic nature means you can adopt FAST incrementally, mixing it with React, Vue, Angular, or vanilla JavaScript without architectural constraints.
The project maintains active community engagement through Discord and GitHub, with documented contribution pathways including good first issues for newcomers. Development is guided by a public roadmap tracking major features. The team provides comprehensive documentation covering quick starts, integration patterns, and component building, alongside a contributor guide for those wanting to participate in development.
