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---
layout: ~/layouts/MainLayout.astro
title: Migrating to v0.21
description: How to migrate projects from Astro v0.20.
---
## Vite
Starting in v0.21, Astro is built with [Vite].
As a result, configurations written in `snowpack.config.mjs` should be moved into `astro.config.mjs`.
```js
// @ts-check
/** @type {import('astro').AstroUserConfig} */
export default {
renderers: [],
vite: {
plugins: [],
},
};
```
To learn more about configuring Vite, please visit their [configuration guide](https://vitejs.dev/config/).
## Aliasing
In Astro v0.21, import aliases can be added from `tsconfig.json` or `jsconfig.json`.
```json
{
"compilerOptions": {
"baseUrl": ".",
"paths": {
"@/components/*": ["src/components/*"]
}
}
}
```
_These aliases are integrated automatically into [VSCode](https://code.visualstudio.com/docs/languages/jsconfig) and other editors._
## Variables in Scripts & Styles
In Astro v0.21, _serializable_ server-side variables can be passed into client-side `<style>` or `<script>`.
```astro
---
// tick.astro
const foregroundColor = "rgb(221 243 228)";
const backgroundColor = "rgb(24 121 78)";
---
<style define:vars={{foregroundColor, backgroundColor}}>
h-tick {
background-color: var(--backgroundColor);
border-radius: 50%;
color: var(--foregroundColor);
height: 15px;
width: 15px;
}
</style>
<h-tick>✓</h-tick>
```
## Components in Markdown
In Astro v0.21, Components from any framework can be used within Markdown files.
```markdown
---
Layout: '...'
setup: |
import MyReactComponent from '../components/MyReactComponent.jsx'
---
# Hydrating on visibility
<MyReactComponent client:visible>
# Hello world!
</MyReactComponent>
```
## Components in Frontmatter
Previously, you could create mini Astro Components inside of the Astro Frontmatter, using JSX syntax instead of Astro's component syntax. This was always a bit of a hack, but in the new compiler it became impossible to support. We hope to re-introduce this feature in a future release of Astro using a different, non-JSX API.
To migrate to v0.21, please convert all JSX Astro components (that is, any Astro components created inside of another component's frontmatter) to standalone components.
## Environment Variables
In Astro v0.21, environment variables can be loaded from `.env` files in your project directory.
```ini
.env # loaded in all cases
.env.local # loaded in all cases, ignored by git
.env.[mode] # only loaded in specified mode
.env.[mode].local # only loaded in specified mode, ignored by git
```
For security purposes, only variables prefixed with `PUBLIC_` are accessible to your code.
```ini
SECRET_PASSWORD=password123
PUBLIC_ANYBODY=there
```
In this example, `PUBLIC_ANYBODY` will be available as `import.meta.env.PUBLIC_ANYBODY` in server or client code, while `SECRET_PASSWORD` will not.
> In prior releases, these variables were prefixed with `SNOWPACK_PUBLIC_` and required the `@snowpack/plugin-env` plugin.
## File Extensions
In Astro v0.21, files need to be referenced by their actual extension, exactly as it is on disk.
```tsx
// Div.tsx
export default function Div(props) {
return <div />;
}
```
In this example, `Div.tsx` would need to be referenced as `Div.tsx`, not `Div.jsx`.
```diff
- import Div from './Div.jsx' // Astro v0.20
+ import Div from './Div.tsx' // Astro v0.21
```
This same change applies to styles.
```scss
// Div.scss
div {
all: unset;
}
```
```diff
- <link rel="stylesheet" href={Astro.resolve('./Div.css')}>
+ <link rel="stylesheet" href={Astro.resolve('./Div.scss')}>
```
## Plugins
In Astro v0.21, Vite plugins may be configured within `astro.config.mjs`.
```js
import { imagetools } from 'vite-imagetools';
export default {
vite: {
plugins: [imagetools()],
},
};
```
To learn more about Vite plugins, please visit their [plugin guide](https://vitejs.dev/guide/using-plugins.html).
## Custom Renderers
In Astro v0.21, plugins should now use `viteConfig()`.
```diff
// renderer-svelte/index.js
+ import { svelte } from '@sveltejs/vite-plugin-svelte';
export default {
name: '@astrojs/renderer-svelte',
client: './client.js',
server: './server.js',
- snowpackPlugin: '@snowpack/plugin-svelte',
- snowpackPluginOptions: { compilerOptions: { hydratable: true } },
+ viteConfig() {
+ return {
+ optimizeDeps: {
+ include: ['@astrojs/renderer-svelte/client.js', 'svelte', 'svelte/internal'],
+ exclude: ['@astrojs/renderer-svelte/server.js'],
+ },
+ plugins: [
+ svelte({
+ emitCss: true,
+ compilerOptions: { hydratable: true },
+ }),
+ ],
+ };
+ },
}
```
To learn more about Vite plugins, please visit their [plugin guide](https://vitejs.dev/guide/using-plugins.html).
> In prior releases, these were configured with `snowpackPlugin` or `snowpackPluginOptions`.
## Styling Changes
### Autoprefixer
Autoprefixer is no longer run by default. To enable:
1. Install the latest version (`npm i autoprefixer`)
2. Create a `postcss.config.cjs` file at the root of your project with:
```js
module.exports = {
plugins: {
autoprefixer: {},
},
};
```
### Tailwind CSS
Ensure you have PostCSS installed. This was optional in previous releases, but is required now:
1. Intall the latest version of postcss (`npm i -D postcss`)
2. Create a `postcss.config.cjs` file at the root of your project with:
```js
module.exports = {
plugins: {
tailwindcss: {},
},
};
```
For more information, read the [Tailwind CSS documentation](https://tailwindcss.com/docs/installation#add-tailwind-as-a-post-css-plugin)
[snowpack]: https://www.snowpack.dev
[vite]: https://vitejs.dev
|
