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CSS Superset
Any valid CSS is valid ECSS. Use familiar syntax and add only what you need.
ECSSExtended CSS
Declarative component state management directly in your stylesheets — no JavaScript logic in components.
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States Without JS
Declare component parameters and conditional styles right in your .ecss file via @state-def and @if. Logic stays in the styles.
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Full Type Safety
The TypeScript plugin generates precise types for every *.ecss import. Autocomplete and type checking work out of the box.
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Any Framework
Works with React, Vue, Svelte, and SolidJS via a native Vite plugin.
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VS Code Support
The ECSS — Extended CSS extension provides syntax highlighting, error diagnostics, and hover hints for properties.
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Minimal Runtime
A tiny runtime helper (_h, merge) — that's all that goes into your bundle. No heavy dependencies, no unnecessary code.