vitepress/docs/guide/using-vue.md

Using Vue in Markdown

Browser API Access Restrictions

Because VitePress applications are server-rendered in Node.js when generating static builds, any Vue usage must conform to the universal code requirements. In short, make sure to only access Browser / DOM APIs in beforeMount or mounted hooks.

If you are using or demoing components that are not SSR-friendly (for example, contain custom directives), you can wrap them inside the built-in <ClientOnly> component:

<ClientOnly>
  <NonSSRFriendlyComponent/>
</ClientOnly>

Note this does not fix components or libraries that access Browser APIs on import. To use code that assumes a browser environment on import, you need to dynamically import them in proper lifecycle hooks:

<script>
export default {
  mounted () {
    import('./lib-that-access-window-on-import').then(module => {
      // use code
    })
  }
}
</script>

If your module export default a Vue component, you can register it dynamically:

<template>
  <component v-if="dynamicComponent" :is="dynamicComponent"></component>
</template>

<script>
export default {
  data() {
    return {
      dynamicComponent: null
    }
  },

  mounted () {
    import('./lib-that-access-window-on-import').then(module => {
      this.dynamicComponent = module.default
    })
  }
}
</script>

Also see:

• Vue.js > Dynamic Components

Templating

Interpolation

Each Markdown file is first compiled into HTML and then passed on as a Vue component to the Vite process pipeline. This means you can use Vue-style interpolation in text:

Input

{{ 1 + 1 }}

Output

{{ 1 + 1 }}

Directives

Directives also work:

Input

<span v-for="i in 3">{{ i }} </span>

Output

{{ i }} 

Access to Site & Page Data

The compiled component has access to the site metadata and computed properties. For example:

Input

{{ $page }}

Output

{
  "path": "/using-vue.html",
  "title": "Using Vue in Markdown",
  "frontmatter": {}
}

Escaping

By default, fenced code blocks are automatically wrapped with v-pre. To display raw mustaches or Vue-specific syntax inside inline code snippets or plain text, you need to wrap a paragraph with the v-pre custom container:

Input

::: v-pre
`{{ This will be displayed as-is }}`
:::

Output

::: v-pre {{ This will be displayed as-is }} :::

Using Components

When you need to have more flexibility, VitePress allows you to extend your authoring toolbox with your own Vue Components.

Importing components in markdown

If your components are going to be used in only a few places, the recommended way to use them is to importing the components in the file where it is used.

# Docs

This is a .md using a custom component

<CustomComponent />

## More docs

...

<script setup>
import CustomComponent from '../components/CustomComponent.vue'
</script>

Registering global components in the theme

If the components are going to be used across several pages in the docs, they can be registered globally in the theme (or as part of extending the default VitePress theme). Check out the Customization Guide for more information.

In .vitepress/theme/index.js, the enhanceApp function receives the Vue app instance so you can register components as you would do in a regular Vue application.

import DefaultTheme from 'vitepress/theme'

export default {
  ...DefaultTheme,
  enhanceApp({ app }) {
    app.component('VueClickAwayExample', VueClickAwayExample)
  }
}

Later in your markdown files, the component can be interleaved between the content

# Vue Click Away

<VueClickAwayExample />

::: warning IMPORTANT Make sure a custom component’s name either contains a hyphen or is in PascalCase. Otherwise, it will be treated as an inline element and wrapped inside a <p> tag, which will lead to hydration mismatch because <p> does not allow block elements to be placed inside it. :::

Using Components In Headers

You can use Vue components in the headers, but note the difference between the following syntaxes:

Markdown	Output HTML	Parsed Header
# text <Tag/>	<h1>text <Tag/></h1>	text
# text `<Tag/>`	<h1>text <code>&lt;Tag/&gt;</code></h1>	text <Tag/>

The HTML wrapped by <code> will be displayed as-is; only the HTML that is not wrapped will be parsed by Vue.

::: tip The output HTML is accomplished by markdown-it, while the parsed headers are handled by VitePress (and used for both the sidebar and document title). :::

Using CSS Pre-processors

VitePress has built-in support for CSS pre-processors: .scss, .sass, .less, .styl and .stylus files. There is no need to install Vite-specific plugins for them, but the corresponding pre-processor itself must be installed:

# .scss and .sass
npm install -D sass

# .less
npm install -D less

# .styl and .stylus
npm install -D stylus

Then you can use the following in Markdown and theme components:

<style lang="sass">
.title
  font-size: 20px
</style>

Script & Style Hoisting

Sometimes you may need to apply some JavaScript or CSS only to the current page. In those cases, you can directly write root-level <script> or <style> blocks in the Markdown file. These will be hoisted out of the compiled HTML and used as the <script> and <style> blocks for the resulting Vue single-file component:

Built-In Components

VitePress provides Built-In Vue Components like ClientOnly and OutboundLink, check out the Global Component Guide for more information.

Also see:

• Using Components In Headers