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https://ibm.github.io/carbon-components-svelte/?path=/story/accordion--default

Svelte implementation of the Carbon Design System
https://ibm.github.io/carbon-components-svelte/?path=/story/accordion--default

carbon carbon-design-system component-library design-system svelte svelte-components typescript typescript-definitions ui-components ui-library

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Svelte implementation of the Carbon Design System

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README 

        
# carbon-components-svelte



[![NPM][npm]][npm-url]

![GitHub](https://img.shields.io/github/license/carbon-design-system/carbon-components-svelte?color=262626&style=for-the-badge)

![npm downloads to date](https://img.shields.io/npm/dt/carbon-components-svelte?color=262626&style=for-the-badge)



Chat with us on Discord




Carbon Components Svelte is a [Svelte](https://github.com/sveltejs/svelte) component library that implements the [Carbon Design System](https://github.com/carbon-design-system), an open source design system by IBM.



Design systems facilitate design and development through reuse, consistency, and extensibility.



The Carbon Svelte portfolio also includes:



- **[Carbon Icons Svelte](https://github.com/carbon-design-system/carbon-icons-svelte)**: 2,400+ Carbon icons as Svelte components

- **[Carbon Pictograms Svelte](https://github.com/carbon-design-system/carbon-pictograms-svelte)**: 1,100+ Carbon pictograms as Svelte components

- **[Carbon Charts Svelte](https://github.com/carbon-design-system/carbon-charts/tree/master/packages/svelte)**: 20+ charts, powered by d3

- **[Carbon Preprocess Svelte](https://github.com/carbon-design-system/carbon-preprocess-svelte)**: Collection of Svelte preprocessors for Carbon



## [Documentation](https://svelte.carbondesignsystem.com)



Other forms of documentation are auto-generated:



- **[TypeScript definitions](types)**: Component TypeScript definitions

- **[Component Index](COMPONENT_INDEX.md)**: Component API in Markdown format

- **[Component API](docs/src/COMPONENT_API.json)**: Component API in JSON format



## Installation



```sh

# npm

npm i carbon-components-svelte



# pnpm

pnpm i carbon-components-svelte



# Yarn

yarn add carbon-components-svelte



# Bun

bun add carbon-components-svelte

```



## Usage



### Styling



Before importing components, you will need to first apply Carbon component styles. The Carbon Design System supports five themes (2 light, 3 dark).



- **white.css**: Default Carbon theme (light)

- **g10.css**: Gray 10 theme (light)

- **g80.css**: Gray 80 theme (dark)

- **g90.css**: Gray 90 theme (dark)

- **g100.css**: Gray 100 theme (dark)

- **all.css**: All themes (White, Gray 10, Gray 90, Gray 100) using [CSS variables](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties)



Each StyleSheet is [generated](scripts/build-css.js) from the flagship [carbon-components](https://github.com/carbon-design-system/carbon/tree/main/packages/carbon-components) library.



The compiled CSS is generated from the following `.scss` files:



- [css/white.scss](css/white.scss)

- [css/g10.scss](css/g10.scss)

- [css/g80.scss](css/g80.scss)

- [css/g90.scss](css/g90.scss)

- [css/g100.scss](css/g100.scss)

- [css/all.scss](css/all.scss)



#### CSS StyleSheet



```js

// White theme

import "carbon-components-svelte/css/white.css";



// Gray 10 theme

import "carbon-components-svelte/css/g10.css";



// Gray 80 theme

import "carbon-components-svelte/css/g80.css";



// Gray 90 theme

import "carbon-components-svelte/css/g90.css";



// Gray 100 theme

import "carbon-components-svelte/css/g100.css";



// All themes

import "carbon-components-svelte/css/all.css";

```



### SCSS



The most performant method to load styles is to import SCSS directly from carbon-components. Although it requires more set up, you can reduce the size of the bundle CSS by importing individual component styles instead of a pre-compiled CSS StyleSheet.



Refer to the [official Carbon guide on SASS](https://github.com/carbon-design-system/carbon/blob/v10/docs/guides/sass.md) for documentation.



### Dynamic theming



Use the "all.css" StyleSheet for dynamic, client-side theming.



```js

import "carbon-components-svelte/css/all.css";

```



Update the theme by setting the `theme` attribute on the `html` element. The default `theme` is `"white"`.



```html



  

    ...

  



```



Programmatically switch between each of the five Carbon themes by setting the "theme" attribute on the HTML element.



```html



  let theme = "white"; // "white" | "g10" | "g80" | "g90" | "g100"



  $: document.documentElement.setAttribute("theme", theme);



```



### Importing components



Import components from `carbon-components-svelte` in the `script` tag of your Svelte file. Visit the [documentation site](https://svelte.carbondesignsystem.com) for examples.



```html



  import { Accordion, AccordionItem } from "carbon-components-svelte";



   Content 1 

   Content 2 

   Content 3 



```



**Refer to [COMPONENT_INDEX.md](COMPONENT_INDEX.md) for component API documentation.**



## Preprocessors & Plugins



[carbon-preprocess-svelte](https://github.com/carbon-design-system/carbon-preprocess-svelte) is a collection of Svelte preprocessors for Carbon.



> [!NOTE]

> Using `carbon-preprocess-svelte` is optional and not a prerequisite for this library. It should be installed as a development dependency.



```sh

# npm

npm i -D carbon-preprocess-svelte



# pnpm

pnpm i -D carbon-preprocess-svelte



# Yarn

yarn add -D carbon-preprocess-svelte



# Bun

bun add -D carbon-preprocess-svelte

```



### `optimizeImports`



`optimizeImports` is a Svelte preprocessor that rewrites barrel imports from Carbon components/icons/pictograms packages to their source Svelte code paths. This can significantly speed up development and production build compile times while preserving typeahead and autocompletion offered by integrated development environments (IDE) like VS Code.



The preprocessor optimizes imports from the following packages:



- [carbon-components-svelte](https://github.com/carbon-design-system/carbon-components-svelte)

- [carbon-icons-svelte](https://github.com/carbon-design-system/carbon-icons-svelte)

- [carbon-pictograms-svelte](https://github.com/carbon-design-system/carbon-pictograms-svelte)



**Before & After**



```diff

- import { Button } from "carbon-components-svelte";

+ import Button from "carbon-components-svelte/src/Button/Button.svelte";



- import { Add } from "carbon-icons-svelte";

+ import Add from "carbon-icons-svelte/lib/Add.svelte";



- import { Airplane } from "carbon-pictograms-svelte";

+ import Airplane from "carbon-pictograms-svelte/lib/Airplane.svelte";

```



#### Usage



See [examples](examples) for full configurations.



```js

// svelte.config.js

import { optimizeImports } from "carbon-preprocess-svelte";



export default {

  preprocess: [optimizeImports()],

};

```



Any other preprocessors that transpile code in the `script` block should be invoked before `optimizeImports`.



For example, `vitePreprocess` should precede `optimizeImports`.



```diff

// svelte.config.js

+ import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";

import { optimizeImports } from "carbon-preprocess-svelte";



export default {

  preprocess: [

+   vitePreprocess(),

    optimizeImports()

  ],

};

```



### `optimizeCss`



`optimizeCss` is a Vite plugin that removes unused Carbon styles at build time. The plugin is compatible with Rollup ([Vite](https://vitejs.dev/guide/api-plugin) extends the Rollup plugin API).



`[email protected]` or greater is required.



```diff

$ vite build



Optimized index-CU4gbKFa.css

- Before: 606.26 kB

+ After:   53.22 kB (-91.22%)



dist/index.html                  0.34 kB │ gzip:  0.24 kB

dist/assets/index-CU4gbKFa.css  53.22 kB │ gzip:  6.91 kB

dist/assets/index-Ceijs3eO.js   53.65 kB │ gzip: 15.88 kB

```



> [!NOTE]

> This is a plugin and not a Svelte preprocessor. It should be added to the list of `vite.plugins`. For Vite set-ups, this plugin is only run when building the app. For Rollup and Webpack, you should conditionally apply the plugin to only execute when building for production.



#### Usage



See [examples](examples) for full configurations.



```js

// vite.config.js

import { sveltekit } from "@sveltejs/kit/vite";

import { optimizeCss } from "carbon-preprocess-svelte";

import { defineConfig } from "vite";



export default defineConfig({

  plugins: [sveltekit(), optimizeCss()],

});

```



## Examples



- [examples/rollup](examples/rollup/)

- [examples/sveltekit](examples/sveltekit/)

- [examples/vite](examples/vite/)

- [examples/webpack](examples/webpack/)



## TypeScript support



[TypeScript definitions](types) are generated by [sveld](https://github.com/carbon-design-system/sveld).



## Contributing



Refer to the [Contributing guidelines](CONTRIBUTING.md).



## [Changelog](CHANGELOG.md)



## License



[Apache 2.0](LICENSE)



[npm]: https://img.shields.io/npm/v/carbon-components-svelte.svg?color=262626&style=for-the-badge

[npm-url]: https://npmjs.com/package/carbon-components-svelte



## IBM Telemetry IBM Telemetry



This package uses IBM Telemetry to collect de-identified and anonymized metrics data in CI environments. By installing

this package as a dependency you are agreeing to telemetry collection. To opt out, see

[Opting out of IBM Telemetry data collection](https://github.com/ibm-telemetry/telemetry-js/tree/main#opting-out-of-ibm-telemetry-data-collection).

For more information on the data being collected, please see the

[IBM Telemetry documentation](https://github.com/ibm-telemetry/telemetry-js/tree/main#ibm-telemetry-collection-basics).