Attributify preset

This enables the attributify mode for other presets.

Source Code

Installation

pnpm

pnpm add -D @unocss/preset-attributify

yarn

yarn add -D @unocss/preset-attributify

npm

npm install -D @unocss/preset-attributify

uno.config.ts

import presetAttributify from '@unocss/preset-attributify'

export default defineConfig({
  presets: [
    presetAttributify({ /* preset options */ }),
    // ...
  ],
})

TIP

This preset is included in the unocss package, you can also import it from there:

import { presetAttributify } from 'unocss'

Attributify Mode

Imagine you have this button using Tailwind CSS's utilities. When the list gets longer, it becomes really hard to read and maintain.

<button class="bg-blue-400 hover:bg-blue-500 text-sm text-white font-mono font-light py-2 px-4 rounded border-2 border-blue-200 dark:bg-blue-500 dark:hover:bg-blue-600">
  Button
</button>

With attributify mode, you can separate utilities into attributes:

<button
  bg="blue-400 hover:blue-500 dark:blue-500 dark:hover:blue-600"
  text="sm white"
  font="mono light"
  p="y-2 x-4"
  border="2 rounded blue-200"
>
  Button
</button>

For example, text-sm text-white could be grouped into text="sm white" without duplicating the same prefix.

Prefix self-referencing

For utilities like flex, grid, border, that have the utilities same as the prefix, a special ~ value is provided.

For example:

<button class="border border-red">
  Button
</button>

Can be written as:

<button border="~ red">
  Button
</button>

Valueless attributify

In addition to Windi CSS's attributify mode, this preset also supports valueless attributes.

For example,

<div class="m-2 rounded text-teal-400" />

now can be

<div m-2 rounded text-teal-400 />

INFO

Note: If you are using JSX, <div foo> might be transformed to <div foo={true}> which will make the generated CSS from UnoCSS fail to match the attributes. To solve this, you might want to try transformer-attributify-jsx along with this preset.

Properties conflicts

If the name of the attributes mode ever conflicts with the elements' or components' properties, you can add un- prefix to be specific to UnoCSS's attributify mode.

For example:

<a text="red">This conflicts with links' `text` prop</a>
<!-- to -->
<a un-text="red">Text color to red</a>

Prefix is optional by default, if you want to enforce the usage of prefix, set

presetAttributify({
  prefix: 'un-',
  prefixedOnly: true, // <--
})

You can also disable the scanning for certain attributes by:

presetAttributify({
  ignoreAttributes: [
    'text'
    // ...
  ]
})

TypeScript support (JSX/TSX)

Create shims.d.ts with the following content:

By default, the type includes common attributes from @unocss/preset-uno. If you need custom attributes, refer to the type source to implement your own type.

Vue

Since Volar 0.36, it's now strict to unknown attributes. To opt-out, you can add the following file to your project:

html.d.ts

declare module '@vue/runtime-dom' {
  interface HTMLAttributes {
    [key: string]: any
  }
}
declare module '@vue/runtime-core' {
  interface AllowedComponentProps {
    [key: string]: any
  }
}
export {}

React

import type { AttributifyAttributes } from '@unocss/preset-attributify'

declare module 'react' {
  interface HTMLAttributes<T> extends AttributifyAttributes {}
}

Vue 3

import type { AttributifyAttributes } from '@unocss/preset-attributify'

declare module '@vue/runtime-dom' {
  interface HTMLAttributes extends AttributifyAttributes {}
}

SolidJS

import type { AttributifyAttributes } from '@unocss/preset-attributify'

declare module 'solid-js' {
  namespace JSX {
    interface HTMLAttributes<T> extends AttributifyAttributes {}
  }
}

Svelte & SvelteKit

declare namespace svelteHTML {
  import type { AttributifyAttributes } from '@unocss/preset-attributify'

  type HTMLAttributes = AttributifyAttributes
}

Astro

import type { AttributifyAttributes } from '@unocss/preset-attributify'

declare global {
  namespace astroHTML.JSX {
    interface HTMLAttributes extends AttributifyAttributes { }
  }
}

Preact

import type { AttributifyAttributes } from '@unocss/preset-attributify'

declare module 'preact' {
  namespace JSX {
    interface HTMLAttributes extends AttributifyAttributes {}
  }
}

Attributify with Prefix

import type { AttributifyNames } from '@unocss/preset-attributify'

type Prefix = 'uno:' // change it to your prefix

interface HTMLAttributes extends Partial<Record<AttributifyNames<Prefix>, string>> {}

Options

strict

• type: boolean
• default: false

Only generate CSS for attributify or class.

prefix

• type: string
• default: 'un-'

The prefix for attributify mode.

prefixedOnly

• type: boolean
• default: false

Only match for prefixed attributes.

nonValuedAttribute

• type: boolean
• default: true

Support matching non-valued attributes.

ignoreAttributes

• type: string[]

A list of attributes to be ignored from extracting.

trueToNonValued

• type: boolean
• default: false

Non-valued attributes will also match if the actual value represented in DOM is true. This option exists for supporting frameworks that encodes non-valued attributes as true. Enabling this option will break rules that ends with true.

Credits

Initial idea by @Tahul and @antfu. Prior implementation in Windi CSS by @voorjaar.