ThemedImage Component

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Features

✅ Supports both light and dark mode images
✅ Uses Astro’s optimized Image component for performance
✅ Supports the ~/images alias path
✅ Automatic image optimization and processing
✅ TypeScript support with strict typing
✅ Follows Starlight’s theming conventions (light:sl-hidden and dark:sl-block)

Live Demo

Try switching between light and dark mode to see the component in action:

Usage

Basic Usage

---
import ThemedImage from '~/components/ThemedImage';
---

<ThemedImage
  alt="Staking Flow"
  sources={{
    light: '~/images/staking-light.svg',
    dark: '~/images/staking-dark.svg',
  }}
/>

With Custom Dimensions

<ThemedImage
  alt="Aptos Token Standard Flow"
  sources={{
    light: '~/images/aptos-token-standard-flow.svg',
    dark: '~/images/aptos-token-standard-flow-dark.svg',
  }}
  width={600}
  height={400}
/>

With Custom CSS Class

<ThemedImage
  alt="Digital Asset"
  sources={{
    light: '~/images/digital-asset-light.svg',
    dark: '~/images/digital-asset-dark.svg',
  }}
  class="rounded-lg shadow-md"
/>

Using Imported Images

---
import lightImage from '~/images/my-light-image.png';
import darkImage from '~/images/my-dark-image.png';
import ThemedImage from '~/components/ThemedImage';
---

<ThemedImage
  alt="My Image"
  sources={{
    light: lightImage,
    dark: darkImage,
  }}
/>

Props

Prop	Type	Required	Default	Description
`alt`	`string`	✅	-	Alt text for the image (required for accessibility)
`sources`	`{ light: string \| ImageMetadata, dark: string \| ImageMetadata }`	✅	-	Object containing light and dark mode image sources
`width`	`number`	❌	-	Image width in pixels
`height`	`number`	❌	-	Image height in pixels
`loading`	`'lazy' \| 'eager'`	❌	`'lazy'`	Image loading strategy
`decoding`	`'async' \| 'sync' \| 'auto'`	❌	`'async'`	Image decoding strategy
`class`	`string`	❌	`''`	Additional CSS classes to apply

How It Works

The component renders two <Image> components:

Light mode image: Visible in light theme, hidden in dark theme (light:sl-block dark:sl-hidden)
Dark mode image: Hidden in light theme, visible in dark theme (light:sl-hidden dark:sl-block)

Both images use Astro’s optimized <Image> component, which provides:

Automatic image optimization
WebP/AVIF format conversion
Responsive image generation
Lazy loading by default
Cumulative Layout Shift (CLS) prevention

Image Path Aliases

The component supports the ~/images alias configured in your Astro project:

export default defineConfig({
  vite: {
    resolve: {
      alias: {
        "~/images": fileURLToPath(new URL("./src/assets/images", import.meta.url)),
      },
    },
  },
});

This allows you to use paths like ~/images/my-image.svg instead of relative paths.

CSS Classes

The component uses Starlight’s theming classes:

light:sl-block - Shows element in light mode
dark:sl-hidden - Hides element in dark mode
light:sl-hidden - Hides element in light mode
dark:sl-block - Shows element in dark mode

More Examples

Here are additional examples showing different use cases: