# SvelteKit Sprite Plugin
This plugin simplifies the process of using SVG sprites within your SvelteKit projects. It compiles your SVG files into a single sprite, optimizing them with SVGO, and injects the sprite directly into your application's HTML.
## Key Features
* **SVG Sprite Generation:** Creates a single SVG sprite containing symbols derived from your source SVG files.
* **Optimized with SVGO:** Applies SVGO (Scalable Vector Graphics Optimizer) to reduce file size and improve performance. Includes options to customize optimization.
* **Unique Symbol IDs:** Generates unique IDs for all symbols within the sprite, ensuring proper referencing.
* **Folder-Based IDs:** Supports folder-based organization of your SVG files, reflecting in the symbol IDs for easy referencing.
* **Direct HTML Injection:** Injects the generated sprite directly into your application's `app.html` file for streamlined integration.
* **File Watcher:** Watches for changes in your SVG source directory and automatically regenerates the sprite during development.
* **Style Prefix:** Replace all id's inside the svg files to be more specific to your project
## Roadmap (Completed features are marked)
- [x] Build sprite from folder
- [x] Style id encapsulating
- [x] Generate a single SVG sprite file.
- [x] Remove `injectLabel` option.
- [x] Add `outputFile` option.
- [x] Add watch for `svgSource` change.
- [x] Reload the page when the sprite file is generated.
- [ ] Build sprite from files array
- [ ] Error handling
- [ ] Save sprite to file
- [ ] Unwrap symbols from file in folder
- [ ] Add svg's from @import
## Get Started
**1. Install the Plugin:**
Run the following command in your SvelteKit project:
```bash
npm install -D sveltekit-sprite
```
**2. Configure Vite:**
Import and configure the plugin in your `vite.config.js` file:
```javascript
import { sveltekit } from '@sveltejs/kit/vite';
import { sveltekitSprite } from 'sveltekit-sprite';
/** @type {import('vite').UserConfig} */
const config = {
plugins: [
sveltekit(),
sveltekitSprite({
// Options go here (see below)
}),
],
};
export default config;
```
**3. Place SVG Files:**
Place your SVG files within a designated source directory. The default location is `src/lib/sprite`, but this can be customized using the [`svgSource`](#svgsource) option.
**4. Integrate the Sprite into Your App (using `hooks.server.ts`)**:
To integrate the SVG sprite with your application you have to:
* **Add label to app template:**
In `app.html` add label `%vite.plugin.sprite%` to point Vite where to inline the svg sprite.
```html
%vite.plugin.sprite%
%sveltekit.body%
```
* **Create or update** `src/hooks.server.ts` file.
```ts
import { sequence } from '@sveltejs/kit/hooks';
import svgSprite from '$lib/sveltekit-sprite.svg?raw';
const handleSvgSprite: Handle = async ({ event, resolve }) => {
return resolve(event, {
transformPageChunk: ({ html }) => html.replace('%vite.plugin.sprite%', svgSprite ?? '')
});
};
export const handle: Handle = sequence(handleSvgSprite);
```
**5. Add Links to SVG Symbols:**
Reference the specific symbols in your Svelte components using the following format:
```html
```
* `[symbolPrefix]` is the value you set for the `symbolPrefix` option (defaults to `svg`).
* `[subfolder]` is the name of the subfolder (if any) where your SVG file is located within the `svgSource` directory. Use empty string if no subfolders.
* `[file-name]` is the name of your SVG file (without the `.svg` extension).
**Example:**
If you have an SVG file named `star.svg` located in `src/lib/sprite/icons/`, and you're using the default `symbolPrefix`, the ID would be `#svg--icons-star`.
## Options
Here's a breakdown of the available options:
### `svgSource`
* **Type:** `string`
* **Default:** `'src/lib/sprite'`
* **Description:** Specifies the directory where your SVG source files are located (relative to your project root). The plugin watches this folder for changes.
```javascript
sveltekitSprite({
svgSource: 'src/assets/svg',
});
```
### `outputFile`
* **Type:** `string`
* **Default:** `'src/lib/sveltekit-sprite.svg'`
* **Description:** Specifies the output file where the generated SVG sprite will be saved. This file is then imported and used in your `hooks.server.ts` file, as shown in the [Get Started](#get-started) section.
```javascript
sveltekitSprite({
outputFile: 'static/sprite.svg', // Place in the static folder for direct access
});
```
### `symbolPrefix`
* **Type:** `string`
* **Default:** `'svg'`
* **Description:** The prefix to be added to the beginning of each symbol ID in the sprite. This helps you uniquely identify your SVG symbols.
```javascript
sveltekitSprite({
symbolPrefix: 'icon',
});
```
**Usage in Svelte:**
```html
```
### `stylePrefix`
* **Type:** `string`
* **Default:** `'icon'`
* **Description:** The prefix to be added to all IDs inside the svg files to be more specific to your project.
```javascript
sveltekitSprite({
stylePrefix: 'icon-style',
});
```
### `svgoOptions`
* **Type:** `object`
* **Default:** `{ presetDefault: true }`
* **Description:** Configuration options for the SVGO optimizer. Refer to the [SVGO documentation](https://github.com/svg/svgo) for a comprehensive list of available options.
* `presetDefault`: Enables or disables SVGO's default plugins.
* You can override default plugins.
```javascript
sveltekitSprite({
svgoOptions: {
presetDefault: true, // or false to disable default plugins
plugins: [
{ name: 'removeViewBox', active: false }, // Disable removeViewBox
{ name: 'removeAttrs', params: { attrs: ['fill', 'stroke'] } }, // Remove fill and stroke attributes
],
},
});
```
**⚠️ Important Notes about `svgoOptions`:**
* If you set `presetDefault` to `false`, you'll typically want to specify the `plugins` option to configure the optimizations you want to apply. Otherwise, no optimizations will occur.
* For building the sprite from folder the plugin add `removeViewBox: false` option.
* `prefixIds` option is always on for build a sprite from a folder with the: `prefix` option, you can't override it.
## Usage in Svelte without SvelteKit (Not tested)
While primarily designed for SvelteKit, you can potentially integrate the sprite into a standard Svelte project (not tested):
1. **Install the Plugin:** `npm install -D sveltekit-sprite`
2. **Configure Vite:** Configure the plugin inside `vite.config.js`.
3. **Import the Sprite:**
```svelte
{@html svgSprite}
```
4. **Add Links:** follow [5. Add Links to SVG Symbols:](#add-links-to-svg-symbols) section to implement symbols in your project