compose-svelted

Compose-inspired UI framework for Svelte
Declarative layout · Immutable modifiers · Structural motion · Compose-like navigation

✨ What is compose-svelted?

compose-svelted is an experimental but ambitious UI framework that brings the Jetpack Compose mental model to the Svelte ecosystem.

It is not a Material Design clone, and it is not a thin component library.

Instead, it focuses on:

• explicit UI composition
• predictable layout
• declarative motion
• navigation as state

All built on top of Svelte, without virtual DOM abstractions or hidden magic.

🧠 Core Philosophy

UI is a function of state.
Layout, motion, and navigation must be explicit and predictable.

Key ideas:

• No implicit behavior
• No global side effects
• No magic context you cannot reason about
• Everything composes

🧱 Library Structure (High-Level)

Core V1 – Layout & Styling

• Column, Row, Box
• Modifier (immutable, chainable)
• Shapes
• Theme system
• Typography

Core V2 – Motion & Navigation (CLOSED)

• AnimatedVisibility
• AnimatedContent
• Declarative motion
• NavController
• NavHost
• Internal backstack

💪 Strengths

Explicit Layout

Layouts are predictable and composable.

Immutable Modifiers

Describe intent, not CSS.

Structural Motion

Motion is part of the UI structure.

Compose-like Navigation

Navigation without external routers.

🚀 Innovation

• Compose mental model on the web
• Navigation as state
• Motion as structure
• No virtual DOM abstraction

📦 Status

• Alpha
• Core V2 closed
• Core V3 planned

🔮 Roadmap

Core V3

• Nested navigation
• Directional transitions
• Shared elements

⚠️ CSS Baseline (Required)

Compose Svelted assumes a neutral CSS baseline.

You MUST include the following reset in your app:

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

📄 License

MIT

⚠️ CSS Baseline Requirement (Important)

Compose Svelted is layout-deterministic.

To guarantee consistent and predictable behavior of layout components such as Box, Column, Row, Surface, Scaffold, and navigation containers, a neutral CSS baseline is required in the host application.

This is intentional and mirrors the contract-based approach of Jetpack Compose.

Required baseline

You must include the following reset in your global styles:

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

Why this matters

Compose Svelted does not:

• force global CSS
• inject layout styles silently
• assume browser defaults

Instead, it expects a minimal, explicit layout contract. Without this baseline, layout behavior may vary between browsers or projects.

Tailwind CSS

Compose Svelted does not require Tailwind CSS.

Tailwind is used internally as an implementation detail for predictable styling, but consumers of the library are not required to install or configure Tailwind.

Future (Core V3)

A reusable baseline.css helper will be provided as an optional import to simplify adoption:

import "@danielito1996/compose-svelted/baseline.css";

This will remain optional and opt-in.