tailwindcss-with

A Tailwind CSS plugin that adds a with-[value] variant for conditional styling based on class presence.

Installation

npm install tailwindcss-with
# or
pnpm add tailwindcss-with

Usage

Add the plugin to your CSS (Tailwind v4):

@plugin "tailwindcss-with";

Or in your Tailwind config (Tailwind v3):

// tailwind.config.js
module.exports = {
  plugins: [require('tailwindcss-with')],
}

How it works

This plugin creates a with-[value] variant that matches elements having a class starting with or containing {value}-.

Use with Tailwind's built-in not-* variant for negation:

• with-[size]:w-auto — applies when a size-* class is present
• not-with-[size]:w-9 — applies when NO size-* class is present

Example

<!-- This button will have w-9 when no size-* class is present -->
<button class="not-with-[size]:w-9">Click me</button>

<!-- When you add size-12, the w-9 won't apply -->
<button class="not-with-[size]:w-9 size-12">Click me</button>

Why this plugin?

When using inline Tailwind CSS selectors like [&:not([class*='size-'])]:w-9, the class name itself contains size-, causing the selector to never match (self-referencing problem).

This plugin solves that by:

1. The class name not-with-[size]:w-9 contains size] (with a bracket)
2. The generated CSS checks for classes containing size- (with a hyphen)
3. Since size] ≠ size-, there's no self-referencing collision! ✅

License

MIT