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A superset of CSS
Any valid CSS is valid ECSS. Use the familiar syntax and add only what you need.
ECSSExtended CSS
Declarative component state management right in your stylesheets — no JavaScript logic in components.
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State without JS
Declare component parameters and conditional styles right in the .ecss file via @param and @if. The logic stays in the styles.
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Fully typed
The TypeScript plugin generates precise types for every *.ecss import. Autocompletion and type checking work out of the box.
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Any framework
Works with React, Vue, Svelte and SolidJS through a native Vite plugin.
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VS Code support
The ECSS — Extended CSS extension provides syntax highlighting, error diagnostics and hover hints.
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Minimal runtime
A tiny runtime helper assembles classes and CSS variables — almost nothing else ends up in the bundle. No heavy dependencies.