fsharp-frontend

MVU (Model-View-Update) is a functional architecture that manages state through immutable models, user messages, and pure update functions. F# with Elmish implements MVU by defining a Model type, Msg discriminated union, Update function, and View function using Feliz components, enabling predictable state flows and easy testing.

Yes, Elmish uses Cmd to manage side effects including async API calls. RemoteData patterns (NotAsked, Loading, Success, Failure) type-safely model async states, allowing you to render loading indicators, handle errors, and display results without callback hell.

Feliz provides a DSL for building composable React components in F#. Structure components as pure functions accepting props, use discriminated unions for component state variants, and combine them with TailwindCSS and DaisyUI utilities for styling, enabling type-safe, reusable UI blocks.

Elmish supports forms through separate form state in your Model and dedicated Msg cases for field updates and validation. RemoteData tracks submission status; Cmd handles API validation calls; Update applies form logic and error handling, creating responsive forms with real-time feedback.

Feliz accepts className strings for Tailwind utilities and DaisyUI component classes directly in component definitions. Compose utility classes as strings in View functions, or extract repeated patterns into helper functions, keeping styling colocated with component logic.

Set up an F# web project with Elmish.React and Feliz packages, create Types.fs for Model and Msg, State.fs for init and update logic, and View.fs for Feliz components. Import RemoteData for async handling and configure TailwindCSS for styling.