122 lines
4.6 KiB
Markdown
122 lines
4.6 KiB
Markdown
## ✍️ Markdown
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Astro comes with out-of-the-box Markdown support powered by the expansive [**remark**](https://github.com/remarkjs/remark) ecosystem.
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## Remark Plugins
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**This is the first draft of Markdown support!** While we plan to support user-provided `remark` plugins soon, our hope is that you won't need `remark` plugins at all!
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In addition to [custom components inside the `<Markdown>` component](#markdown-component), Astro comes with [GitHub-flavored Markdown](https://github.github.com/gfm/) support, [Footnotes](https://github.com/remarkjs/remark-footnotes) syntax, [Smartypants](https://github.com/silvenon/remark-smartypants), and syntax highlighting via [Prism](https://prismjs.com/) pre-enabled. These features are likely to be configurable in the future.
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### Markdown Pages
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Astro treats any `.md` files inside of the `/src/pages` directory as pages. These pages are processed as plain Markdown files and do not support components. If you're looking to embed rich components in your Markdown, take a look at the [Markdown Component](#markdown-component) section.
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#### `layout`
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The only special Frontmatter key is `layout`, which defines the relative path to a `.astro` component which should wrap your Markdown content.
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`src/pages/index.md`
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```md
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---
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layout: ../layouts/main.astro
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---
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# Hello world!
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```
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Layout files are normal `.astro` components. Any Frontmatter defined in your `.md` page will be exposed to the Layout component as the `content` prop. `content` also has an `astro` key which holds special metadata about your file, like the complete Markdown `source` and a `headings` object.
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The rendered Markdown content is placed into the default `<slot />` element.
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`src/layouts/main.astro`
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```jsx
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---
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export let content;
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---
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<html>
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<head>
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<title>{content.title}</title>
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</head>
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<body>
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<slot/>
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</body>
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</html>
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```
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### Markdown Component
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Similar to tools like [MDX](https://mdxjs.com/) or [MDsveX](https://github.com/pngwn/MDsveX), Astro makes it straightforward to embed rich, interactive components inside of your Markdown content. The `<Markdown>` component is statically rendered, so it does not add any runtime overhead.
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Astro exposes a special `Markdown` component for `.astro` files which enables markdown syntax for its children **recursively**. Within the `Markdown` component you may also use plain HTML or any other type of component that is supported by Astro.
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````jsx
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---
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// For now, this import _must_ be named "Markdown" and _must not_ be wrapped with a custom component
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// We're working on easing these restrictions!
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import Markdown from 'astro/components/Markdown.astro';
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import Layout from '../layouts/main.astro';
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import MyFancyCodePreview from '../components/MyFancyCodePreview.tsx';
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const expressions = 'Lorem ipsum';
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---
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<Layout>
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<Markdown>
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# Hello world!
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**Everything** supported in a `.md` file is also supported here!
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There is _zero_ runtime overhead.
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In addition, Astro supports:
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- Astro {expressions}
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- Automatic indentation normalization
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- Automatic escaping of expressions inside code blocks
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```jsx
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// This content is not transformed!
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const object = { someOtherValue };
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```
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- Rich component support like any `.astro` file!
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- Recursive Markdown support (Component children are also processed as Markdown)
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<MyFancyCodePreview:visible>
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```jsx
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const object = { someOtherValue };
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```
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</MyFancyCodePreview:visible>
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</Markdown>
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</Layout>
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````
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### Remote Markdown
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If you have Markdown in a remote source, you may pass it directly to the Markdown component. For example, the example below fetches the README from Snowpack's GitHub repository and renders it as HTML.
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```jsx
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---
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import Markdown from 'astro/components/Markdown.astro';
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const content = await fetch('https://raw.githubusercontent.com/snowpackjs/snowpack/main/README.md').then(res => res.text());
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---
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<Layout>
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<Markdown>{content}</Markdown>
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</Layout>
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```
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### Security FAQs
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**Aren't there security concerns to rendering remote markdown directly to HTML?**
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Yes! Just like with regular HTML, improper use the `<Markdown>` component can open you up to a [cross-site scripting (XSS)](https://en.wikipedia.org/wiki/Cross-site_scripting) attack. If you are rendering untrusted content, be sure to _santize your content **before** rendering it_.
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**Why not use a prop like React's `dangerouslySetInnerHTML={{ __html: content }}`?**
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Rendering a string of HTML (or Markdown) is an extremely common use case when rendering a static site and you probably don't need the extra hoops to jump through. Rendering untrusted content is always dangerous! Be sure to _santize your content **before** rendering it_.
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