storybook

packages/svelte/.storybook/preview.js

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+import { withThemeByDataAttribute } from '@storybook/addon-themes';
+import './preview.css';
+
+/** @type { import('@storybook/svelte').Preview } */
+const preview = {
+	tags: ['autodocs'],
+	parameters: {
+		controls: {
+			matchers: {
+				color: /(background|color)$/i,
+				date: /Date$/i,
+			},
+		},
+	},
+	decorators: [
+		withThemeByDataAttribute({
+			themes: {
+				light: 'light',
+				dark: 'dark',
+				night: 'night',
+			},
+			defaultTheme: 'dark',
+			attributeName: 'data-theme',
+		}),
+	],
+};
+
+export default preview;