PostCSS Tailwind Shortcuts

PostCSS plugin that scans your CSS declarations and looks for function calls that match the configured shortcuts. When it finds a match, it replaces the function call with a CSS variable reference that follows Tailwind v4's naming conventions. Works with both Tailwind and custom CSS files.

For example:

• speed(slow) becomes var(--transition-duration-slow)
• colorCode('primary') becomes var(--color-primary)

Installation

npm install @locomotivemtl/postcss-tailwind-shortcuts --save-dev

Usage

To use this plugin, include it in your PostCSS configuration file.

Basic Configuration

PostCSS Configuration:

import postcssTailwindShortcuts from '@locomotivemtl/postcss-tailwind-shortcuts';

export default {
    plugins: [postcssTailwindShortcuts()]
};

With Custom Shortcuts

You can add your own custom shortcuts by passing them in the options:

import postcssTailwindShortcuts from '@locomotivemtl/postcss-tailwind-shortcuts';

export default {
    plugins: [
        postcssTailwindShortcuts({
            shortcuts: [
                {
                    functionIdent: 'shadow',
                    cssVariablePrefix: '--shadow'
                },
                {
                    functionIdent: 'radius',
                    cssVariablePrefix: '--radius'
                }
            ]
        })
    ]
};

[!IMPORTANT] Add static to your @theme directive to prevent Tailwind from purging CSS variables. This ensures they remain available for the plugin functions. Source

And set them in your Tailwind theme configuration:

/* Using Tailwind @theme directive */
@theme static {
    --shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-medium: 0.375rem;
}

Options

| Option | Type | Description | | ----------- | ------- | ---------------------------------------------------------------------------------------- | | shortcuts | Array | Array of custom shortcut objects with functionIdent and cssVariablePrefix properties |

Shortcut Object Structure

Each shortcut object should have:

• functionIdent: The function name to use in CSS (e.g., 'shadow')
• cssVariablePrefix: The CSS variable prefix (e.g., '--shadow')

Default Shortcut Functions

This plugin comes with the following pre-configured shortcuts that are based on Tailwind CSS v4's variable naming conventions:

• speed(value): Converts to var(--transition-duration-{value})
• ease(value): Converts to var(--ease-{value})
• z(value): Converts to var(--z-index-{value})
• colorCode(value): Converts to var(--color-{value})
• spacing(value): Converts to var(--spacing-{value})
• radius(value): Converts to var(--radius-{value})

These shortcuts are designed to work with Tailwind CSS v4's CSS variable system, where design tokens are exposed as CSS custom properties.

Example Usage

Basic Examples

/* Input CSS */
.example {
    transition-duration: speed(slow);
    transition-timing-function: ease(fast);
    z-index: z(modal);
    color: colorCode(primary);
    margin: spacing(4);
}

/* Output CSS */
.example {
    transition-duration: var(--transition-duration-slow);
    transition-timing-function: var(--ease-fast);
    z-index: var(--z-index-modal);
    color: var(--color-primary);
    margin: var(--spacing-4);
}

With Custom Shortcuts

/* Input CSS */
.card {
    box-shadow: shadow(large);
    border-radius: radius(medium);
    background-color: colorCode('accent');
}

/* Output CSS */
.card {
    box-shadow: var(--shadow-large);
    border-radius: var(--radius-medium);
    background-color: var(--color-accent);
}

Quoted Arguments

The plugin supports both quoted and unquoted arguments:

/* All of these work the same way */
.element {
    border-radius: radius(medium);
    border-radius: radius('medium');
    border-radius: radius('medium');
}

Custom CSS Variables Setup

If you're using custom shortcuts or want to extend the default behavior, you can define additional CSS variables:

/* Custom CSS */
:root {
    --box-shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius-medium: 0.375rem;
}