vite-plugin-html-include

A Vite plugin to include partial HTML files with variable interpolation and slot support — dead simple and fast.

Features

• Use <include file="..."> in your HTML files
• Include .html and .svg files by default
• Nested includes supported
• Use <slot> and <slot name="..."> for dynamic blocks
• Interpolate variables like {{$name}}
• Merges class and style like Vue.js
• All non-variable attributes are applied to the root element
• Ultra fast and zero dependency
• Automatic full-reload when included files change (dev only)

Install

npm install --save-dev vite-plugin-html-include

Usage

vite.config.ts

import { defineConfig } from 'vite'
import htmlInclude from 'vite-plugin-html-include'

export default defineConfig({
  plugins: [
    htmlInclude()
  ]
})

Example

index.html

<include file="components/card.html" $title="Hello">
  <template slot="header">
    <h1>Custom header</h1>
  </template>

  <p>This is the main content</p>

  <template slot="footer">
    <footer>Custom footer</footer>
  </template>
</include>

components/card.html

<div class="card">
  <slot name="header"></slot>
  <div class="body">
    <h2>{{$title}}</h2>
    <slot></slot>
  </div>
  <slot name="footer"></slot>
</div>

Final Output

<div class="card">
    <h1>Custom header</h1>
    <div class="body">
        <h2>Hello</h2>
        <p>This is the main content</p>
    </div>
    <footer>Custom footer</footer>
</div>

Variables: $var and data-$var

You can pass variables to an included component using either $var="..." or data-$var="...". Both methods are equivalent.

Example

<include file="components/card.html" $title="Hello" />
<!-- is equivalent to -->
<include file="components/card.html" data-$title="Hello" />

In both cases, the variable $title will be injected into the component.

Class and Style Merging

When the included component has a single root element:

• class attributes are merged (like Vue)
• style attributes are merged with proper ; normalization
• All other attributes (like id, title, data-*) are injected

Example

<include file="components/button.html" class="primary" style="color: red;" $text="Click me" title="action" />

<!-- components/button.html -->
<button class="btn" style="padding: 10px" title="{{$title}}">
  {{$text}}
</button>

Output:

<button class="btn primary" style="padding: 10px; color: red;" title="action">
  Click me
</button>

Default Slots

If no content is passed, <slot> can define default content.

components/card.html

<div class="card">
  <slot name="header">
    <h2>Default Header</h2>
  </slot>

  <div class="body">
    <slot>
      <p>Default content goes here</p>
    </slot>
  </div>

  <slot name="footer">
    <footer>Default Footer</footer>
  </slot>
</div>

Usage

<include file="components/card.html" />

Output:

<div class="card">
  <h2>Default Header</h2>
  <div class="body">
    <p>Default content goes here</p>
  </div>
  <footer>Default Footer</footer>
</div>

Options

| Option | Type | Default | Description | | --------------------|--------------------|---------------------|-------------------------------------------------| | extensions | string[] | ['.html', '.svg'] | Allowed file types | | delimiters | [string, string] | ['{{','}}'] | Variable interpolation delimiters | | allowAbsolutePaths | boolean | false | Allow absolute file paths | | watch | boolean | true | Auto-reload included files on change during dev |

When watch is enabled, you'll see logs like:

[vite-plugin-html-include] Reload detected: src/components/card.html

Advanced Usage: Custom Delimiters

If you want to use something other than {{ and }}, for example [[ and ]], you can configure it:

htmlInclude({ delimiters: ['[[', ']]'] })

In your HTML:

<div>Hello [[ $name ]]</div>

License

MIT © Tilty.io