What architecture to choose for writing a UI library?

UI libraries often choose a component-oriented architecture with a clear separation between presentation and logic layers. Good practices include using modularity and component isolation to facilitate reuse and testing.

Main approaches:

• Atomic Design — breaking down the interface into atoms, molecules, organisms, etc., which simplifies scaling.
• Flux/Redux-like patterns — for managing component state.
• Using modern frameworks (React, Vue, Svelte) with support for declarative UI.

It is important to ensure:

• Clean API for components.
• Support for styling and theming.
• Documentation and testability.

Example: each component is a separate module with its own state and styles, which can be imported and used independently.