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Astro

Astro is a fresh but familiar approach to building websites. Astro combines decades of proven performance best practices with the DX improvements of the component-oriented era.

With Astro, you can use your favorite JavaScript framework and automatically ship the bare-minimum amount of JavaScriptβ€”by default, it's none at all!

Project Status

⚠️ Astro is still an early beta, missing features and bugs are to be expected! If you can stomach it, then Astro-built sites are production ready and several production websites built with Astro already exist in the wild. We will update this note once we get closer to a stable, v1.0 release.

πŸ”§ Quick Start

# create your project
mkdir new-project-directory
cd new-project-directory
npm init astro

# install your dependencies
npm install

# start the dev server and open your browser
npm start

πŸš€ Build & Deployment

The default Astro project has the following scripts in the /package.json file:

{
  "scripts": {
    "start": "astro dev",
    "build": "astro build"
  }
}

For local development, run:

npm run start

To build for production, run the following command:

npm run build

To deploy your Astro site to production, upload the contents of /dist to your favorite static site host.

πŸ₯Ύ Guides

πŸš€ Basic Usage

Even though nearly-everything is configurable, we recommend starting out by creating an src/ folder in your project with the following structure:

β”œβ”€β”€ src/
β”‚   β”œβ”€β”€ components/
β”‚   └── pages/
β”‚       └── index.astro
β”œβ”€β”€ public/
└── package.json
  • src/components/*: where your reusable components go. You can place these anywhere, but we recommend a single folder to keep them organized.
  • src/pages/*: this is a special folder where your routing lives.

🚦 Routing

Routing happens in src/pages/*. Every .astro or .md file in this folder corresponds with a public URL. For example:

Local file Public URL
src/pages/index.astro /index.html
src/pages/post/my-blog-post.md /post/my-blog-post/index.html

πŸ—‚ Static Assets

Static assets should be placed in a public/ folder in your project. You can place any images, fonts, files, or global CSS in here you need to reference.

πŸͺ¨ Generating HTML with Astro

Astro introduces a special .astro format, which combines the best of HTML with the best of JavaScript.

To learn more about .astro files, read our complete Syntax Guide.

✍️ Markdown

Spend less time configuring your tooling and more time writing content. Astro has phenomenal Markdown support (powered by remark) baked in!

Not only can you use local .md files as pages, but Astro also comes with a <Markdown> component to turn every page into a Markdown file. Using the <Markdown> component in an .astro file should feel very similar to MDX, but with the ability to use components from any framework (with partial hydration, too)!

To learn more about use Markdown in Astro, read our Markdown Guide.

⚑ Dynamic Components

TODO: Astro dynamic components guide

πŸ’§ Partial Hydration

By default, Astro outputs zero client-side JS. If you'd like to include an interactive component in the client output, you may use any of the following techniques.

  • <MyComponent /> will render an HTML-only version of MyComponent (default)
  • <MyComponent:load /> will render MyComponent on page load
  • <MyComponent:idle /> will use requestIdleCallback() to render MyComponent as soon as main thread is free
  • <MyComponent:visible /> will use an IntersectionObserver to render MyComponent when the element enters the viewport

βš›οΈ State Management

Frontend state management depends on your framework of choice. Below is a list of popular frontend state management libraries, and their current support with Astro.

Our goal is to support all popular state management libraries, as long as there is no technical reason that we cannot.

  • React/Preact
    • Redux: Partial Support (Note: You can access a Redux store directly, but full react-redux support requires the ability to set a custom <Provider> wrapper to every component island. Planned.)
    • Recoil: Full Support
  • Svelte
    • Svelte Stores: Full Support
  • Vue:
    • Vuex: Partial Support (Note: You can access a vuex store directly, but full vuex support requires the ability to set a custom vue.use(store) call to every component island. Planned.)

Are we missing your favorite state management library? Add it to the list above in a PR (or create an issue)!

πŸ’… Styling

Styling in Astro is meant to be as flexible as you’d like it to be! The following options are all supported:

Framework Global CSS Scoped CSS CSS Modules
Astro (.astro) βœ… βœ… N/AΒΉ
React / Preact βœ… ❌ βœ…
Vue βœ… βœ… βœ…
Svelte βœ… βœ… ❌

ΒΉ .astro files have no runtime, therefore Scoped CSS takes the place of CSS Modules (styles are still scoped to components, but don’t need dynamic values)

To learn more about writing styles in Astro, see our Styling Guide.

πŸ‘‰ Styling

🐢 Fetching Data

Fetching data is what Astro is all about! Whether your data lives remotely in an API or in your local project, Astro has got you covered.

For fetching from a remote API, use a native JavaScript fetch() (docs) as you are used to. For fetching local content, use Astro.fetchContent() (docs).

// src/components/MyComponent.Astro

---
// Example 1: fetch remote data from your own API
const remoteData = await fetch('https://api.mysite.com/v1/people').then((res) => res.json());

// Example 2: load local markdown files
const localData = Astro.fetchContent('../post/*.md');
---

πŸ—ΊοΈ Sitemap

Astro will automatically create a /sitemap.xml for you for SEO! Be sure to set buildOptions.site in your Astro config so the URLs can be generated properly.

⚠️ Note that Astro won’t inject this into your HTML for you! You’ll have to add the tag yourself in your <head> on all pages that need it:

<link rel="sitemap" href="/sitemap.xml" />
Examples

🍱 Collections (beta)

Fetching data is easy in Astro. But what if you wanted to make a paginated blog? What if you wanted an easy way to sort data, or filter data based on part of the URL? Or generate an RSS 2.0 feed? When you need something a little more powerful than simple data fetching, Astro’s Collections API may be what you need.

πŸ‘‰ Collections API

Publishing Astro components

Using Astro components in your project allows you to break up your pages into small reuseable units of functionality. If you want to share your Astro components you can do so by publishing them to npm.

πŸ‘‰ Publishing Astro components guide

βš™οΈ Config

Configuration for Astro is done through the astro.config.mjs file at the root of your project. To learn more:

πŸ‘‰ astro.config.mjs Reference

Astro uses Snowpack for module resolution. You can configure Snowpack by adding a snowpack.config.mjs file in the root of your project. You might need this to add loader plugins, for example. To learn more:

πŸ‘‰ snowpack.config.mjs Reference

πŸͺ„ Renderers

Astro is able to render React, Svelte, Vue, and Preact components out of the box. If you'd like to add support for another framework, you can build a renderer plugin using the same interface as Astro's official renderers.

πŸ‘‰ Renderer Docs

πŸ“š API

πŸ‘‰ Full API Reference

πŸ‘©πŸ½β€πŸ’» CLI

πŸ‘‰ Command Line Docs

πŸ— Development Server

πŸ‘‰ Dev Server Docs

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