Astro + eleventy-img
A tiny script and component intended to be used with Astro for generating images with eleventy-img. It also supports creating blurry placeholders for said images
It was mostly made for my own website and I do not intend to really support this outside of my own needs as more modern and generalist solutions are in the work for Astro
Installation
npm install astro-eleventy-img
Due to an issue in the current version of Vite used by Astro, you need to add the following to your astro project config file:
vite: {
ssr: {
external: ["@11ty/eleventy-img"],
},
},
Usage
The best way to use this in my opinion is to use it to generate images in the public
folder. That way, they're copied directly to the result website. This is the default behavior.
Javascript Usage
Generating images
---
import { generateImage } from 'astro-eleventy-img';
const myImage = generateImage('src/assets/my_image.png', {
// The options here are passed directly to eleventy-img
widths: [300],
formats: ['webp', 'avif'],
});
---
<img src={myImage.webp[0].url} />
generateImage
returns an object containing all the formats generated and metadata you can use in your HTML, so myImage is equal to:
{
webp: [
{
format: 'webp',
width: 300,
height: 240,
url: '/assets/images/RfSNa8TCUW-300.webp',
sourceType: 'image/webp',
srcset: '/assets/images/RfSNa8TCUW-300.webp 300w',
filename: 'RfSNa8TCUW-300.webp',
outputPath: 'public/assets/images/RfSNa8TCUW-300.webp'
}
],
avif: [
{
format: 'avif',
width: 300,
height: 240,
url: '/assets/images/RfSNa8TCUW-300.avif',
sourceType: 'image/avif',
srcset: '/assets/images/RfSNa8TCUW-300.avif 300w',
filename: 'RfSNa8TCUW-300.avif',
outputPath: 'public/assets/images/RfSNa8TCUW-300.avif'
}
]
}
The following files will be generated in the public/assets/images
folder:
RfSNa8TCUW-300.webp
RfSNa8TCUW-300.avif
Generating placeholders
---
import { generatePlaceholder } from 'astro-eleventy-img';
const myPlaceholder = generatePlaceholder('src/assets/my_image.png');
---
<img src={myPlaceholder.dataURI} width={myPlaceholder.width} height={myPlaceholder.height} />
generatePlaceholder
return an object containing all the properties needed for showing the image. So myPlaceholder
in this example is equal to:
{
dataURI: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAHCAIAAABV+fA3AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAz0lEQVQImQHEADv/AJ7Ho7PYwTt5UhdkNjmLSUOPUCB4MSFzMkGMNACixqksb04WUy4wdz9cnFxPnksbaS0HTCo3hDUAnLmcRnFLQ289ZpZXn7Z9MpA+OYU9EFstVZpHAJ3GaqnPbJXFW5iyZNzLqZWvco+9YHeqVlKXSACu1myt13Cc1GW6ynnFrIjK4ouSzFZ/vlNsskgAytqD1d6Q3+Kevsl/xb951+OXyt6FstVytNRzAIS0S4i2S5u8TK3NXrPOZ57CYqLGXWiqOoi4Rz9UYMGpm241AAAAAElFTkSuQmCC';
width: 640;
height: 514;
quality: 60;
}
Component Usage
Alternatively, it can also be used through a provided component to automatically generate the proper HTML for including the image and its placeholder:
">--- import { Image } from 'astro-eleventy-img'; --- <Image src="src/assets/my_image.png" alt="My super image!" caption="This is my favorite image." />