svelte-remote-image

Display optimized, responsive and progressive images for Svelte. With remote image URL of CDN or other means.

Fade-in and blur on image reveal.
An image URL can be set to fallback if an image cannot be retrieved from the source URL due to an error.
A pre-rendered low-quality dataURI can be set as a placeholder.

Install

Install the package.

$ npm i svelte-remote-image

And import components and types.

	import { Img, Picture, type ImgSrc, type PictureSrc } from "svelte-remote-image";

How to use

Sample code.

Img

<script lang="ts">
	import { Image, type ImageSrc } from "svelte-remote-image";

  // CDN URL
  const optimazerPrefix = 'https://nostr-image-optimizer.ocknamo.com/image/';
  const originalImageUrl = 'https://ocknamo.com/static/b84d6366deec053ff3fa77df01a54464/dccd3/cat.webp'

const imgSrc: ImgSrc = {
	w: 800,
	img: `https://ocknamo.com/cat.jpg`,
	srssets: [
		{
			src: `https://ocknamo.com/cat_1600.jpg`,
			w: 1600,
		},
		{
			src: `https://ocknamo.com/cat_800.jpg`,
			w: 800,
		},
	],
	fallback: ['https://ocknamo.com/cat_fallback.jpg'],
}
</script>

<Img src={imgSrc} style='max-width: 400px; max-width: 80%;' />

The image component renders into:

<img id="svelte-remote-image--6188058" width="800" style="max-width: 80%; visibility: hidden;"
	src="https://ocknamo.com/cat_fallback.jpg" srcset="" alt="" title="" loading="lazy" class="s-6LbhuE7J5MgN">

Inspired by svelte-img.

Picture

TBD

Config

ImageSrc

img: string

Image url.

w: number

Image width.

h?: number

Image height.

srssets: Srcset[]

Image sources for Img component.

webp?: Srcset[]

Image sources for webp.

jpeg?: Srcset[]

Image sources for jpeg.

png?: Srcset[]

Image sources for png.

fallback: string[]

Failback image urls. The order is important because the images are tested in order from the top of the array.

alt: string

Alt text for image.

placeholder?: { dataUri?: string; color?: string }

Image data and background color for fastest display.

blur?: boolean

Whether to use the blur effect when displaying the image. Default false.

Srcset

src: string
- Image URL.
w: number
- Width of actual image.

Developing

Once you've created a project and installed dependencies with npm install (or pnpm install or yarn), start a development server:

npm run dev

# or start the server and open the app in a new browser tab
npm run dev -- --open

Everything inside src/lib is part of your library, everything inside src/routes can be used as a showcase or preview app.

Building

To build your library:

npm run package

To create a production version of your showcase app:

npm run build

You can preview the production build with npm run preview.

To deploy your app, you may need to install an adapter for your target environment.

Publishing

Go into the package.json and give your package the desired name through the "name" option. Also consider adding a "license" field and point it to a LICENSE file which you can create from a template (one popular option is the MIT license).

To publish your library to npm:

npm publish

ocknamo/svelte-remote-image