### Install rollup-plugin-styles

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the plugin using npm, pnpm, or yarn.

```bash
# npm
npm install -D rollup-plugin-styles
# pnpm
pnpm add -D rollup-plugin-styles
# yarn
yarn add rollup-plugin-styles --dev
```

--------------------------------

### Install Stylus Dependency (yarn)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Stylus preprocessor using yarn for use with rollup-plugin-styles.

```bash
# yarn
yarn add stylus --dev

```

--------------------------------

### Install Stylus Dependency (pnpm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Stylus preprocessor using pnpm for use with rollup-plugin-styles.

```bash
# pnpm
pnpm add -D stylus

```

--------------------------------

### Install Less Dependency (yarn)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Less preprocessor using yarn for use with rollup-plugin-styles.

```bash
# yarn
yarn add less --dev

```

--------------------------------

### Install Node-Sass Dependency (pnpm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the node-sass preprocessor using pnpm for use with rollup-plugin-styles.

```bash
# pnpm
pnpm add -D node-sass

```

--------------------------------

### Install Sass Dependency (yarn)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Sass preprocessor using yarn for use with rollup-plugin-styles.

```bash
# yarn
yarn add sass --dev

```

--------------------------------

### Install Less Dependency (npm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Less preprocessor using npm for use with rollup-plugin-styles.

```bash
# npm
npm install -D less

```

--------------------------------

### Install Sass Dependency (pnpm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Sass preprocessor using pnpm for use with rollup-plugin-styles.

```bash
# pnpm
pnpm add -D sass

```

--------------------------------

### Install Less Dependency (pnpm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Less preprocessor using pnpm for use with rollup-plugin-styles.

```bash
# pnpm
pnpm add -D less

```

--------------------------------

### Install Node-Sass Dependency (yarn)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the node-sass preprocessor using yarn for use with rollup-plugin-styles.

```bash
# yarn
yarn add node-sass --dev

```

--------------------------------

### Install Stylus Dependency (npm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Stylus preprocessor using npm for use with rollup-plugin-styles.

```bash
# npm
npm install -D stylus

```

--------------------------------

### Install Sass Dependency (npm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the Sass preprocessor using npm for use with rollup-plugin-styles.

```bash
# npm
npm install -D sass

```

--------------------------------

### Install Node-Sass Dependency (npm)

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Install the node-sass preprocessor using npm for use with rollup-plugin-styles.

```bash
# npm
npm install -D node-sass

```

--------------------------------

### Basic Rollup Configuration

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Configure Rollup to use rollup-plugin-styles. This example sets the output asset file name pattern.

```javascript
// rollup.config.js
import styles from "rollup-plugin-styles";

export default {
  output: {
    // Governs names of CSS files (for assets from CSS use `hash` option for url handler).
    // Note: using value below will put `.css` files near js,
    // but make sure to adjust `hash`, `assetDir` and `publicPath`
    // options for url handler accordingly.
    assetFileNames: "[name]-[hash][extname]",
  },
  plugins: [styles()],
};
```

--------------------------------

### Sass/Less Import Syntax

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Shows how to import Sass and Less files, using the `~` prefix to resolve modules from `node_modules`.

```scss
// Import from `node_modules`
@import "~bulma/css/bulma";
// Local import
@import "./custom";
// ...or
@import "custom";
```

--------------------------------

### CSS/Stylus Import Syntax

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Demonstrates how to use `@import` statements for CSS and Stylus files, including imports from `node_modules` and local files.

```css
/* Import from `node_modules` */
@import "bulma/css/bulma";
/* Local import */
@import "./custom";
/* ...or (if no package named `custom` in `node_modules`) */
@import "custom";
```

--------------------------------

### Sass/Less Partial Import Behavior

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Illustrates how Sass and Less handle partial imports, prioritizing underscored filenames (e.g., `_custom.scss`).

```scss
import "custom";

Will look for `_custom` first (_with the appropriate extension(s)_), and then for `custom` if `_custom` doesn't exist.
```

--------------------------------

### Configure CSS Modules

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Enable and configure CSS Modules support within rollup-plugin-styles. Options include enabling with default settings, custom options, auto-detection, or a custom function for module identification.

```javascript
styles({
  modules: true,
  // ...or with custom options
  modules: {},
  // ...additionally using autoModules
  autoModules: true,
  // ...with custom regex
  autoModules: /\.mod\.\S+$/,
  // ...or custom function
  autoModules: id => id.includes(".modular."),
});

```

--------------------------------

### CSS Injection with Custom Options

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Configure the 'inject' mode for CSS, allowing customization of the injection target, tag behavior, and attributes.

```javascript
styles({
  mode: "inject", // Unnecessary, set by default
  // ...or with custom options for injector
  mode: [
    "inject",
    { container: "body", singleTag: true, prepend: true, attributes: { id: "global" } },
  ],
  // ...or with custom injector
  mode: ["inject", (varname, id) => `console.log(${varname},${JSON.stringify(id)})`],
});
```

--------------------------------

### Importing CSS in JavaScript

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Import CSS files directly into your JavaScript code after configuring the plugin.

```javascript
import "./style.css";
```

--------------------------------

### Emit Processed CSS

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Configure rollup-plugin-styles to emit processed CSS as a separate file. Ensure this plugin is listed before any plugin that consumes pure CSS.

```javascript
// rollup.config.js
import styles from "rollup-plugin-styles";

// Any plugin which consumes pure CSS
import litcss from "rollup-plugin-lit-css";

export default {
  plugins: [
    styles({ mode: "emit" }),

    // Make sure to list it after this one
    litcss(),
  ],
};

```

--------------------------------

### CSS Extraction Configuration

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Configure the 'extract' mode to save processed CSS into a separate file. The filename can be specified directly or relative to the output directory.

```javascript
styles({
  mode: "extract",
  // ... or with relative to output dir/output file's basedir (but not outside of it)
  mode: ["extract", "awesome-bundle.css"],
});
```

--------------------------------

### CSS Import with Named Export

Source: https://github.com/anidetrix/rollup-plugin-styles/blob/main/README.md

Access CSS content as a named export when CSS Modules are enabled or when using specific modes.

```javascript
// Injects CSS, also available as `style` in this example
import style from "./style.css";
// Using named export of CSS string
import { css } from "./style.css";
```

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