# Aesthetic - Core API

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Unifies a [design system](https://www.npmjs.com/package/@aesthetic/system) and a
[CSS-in-JS engine](https://www.npmjs.com/package/@aesthetic/style) into a powerful framework
agnostic API.

```ts
import { Aesthetic } from '@aesthetic/core';
import dayTheme from './design/system/dayTheme';
import nightTheme from './design/system/nightTheme';

const aesthetic = new Aesthetic({
	defaultUnit: 'px',
	deterministicClasses: false,
});

// Register a theme (provided by the design system)
aesthetic.registerDefaultTheme('day', dayTheme);

// Register a theme that has global styles
aesthetic.registerTheme('night', nightTheme, (css) => ({
	'@root': css.mixin('root', {
		backgroundColor: css.var('palette-neutral-bg-base'),
		height: '100%',
	}),
}));

// Create a component style sheet
const styleSheet = aesthetic.createStyleSheet((css) => ({
	button: {
		textAlign: 'center',
		display: 'inline-block',
		padding: css.var('spacing-df'),
	},
}));

// Render the style sheet into the document
const classNames = aesthetic.renderStyleSheet(styleSheet);
```

> Though the core API is framework agnostic and can be used stand-alone, it's encouraged to use a
> framework integration package for better ergonomics.

## Features

Supports all features provided by unified packages, while also providing...

- Register, manage, and activate themes, powered by the design system.
- Automatically activates a theme based on a users preferences (color scheme, contrast, etc).
- Scopes active theme styles and CSS variables to the body to avoid global scope pollution.
- Factories and renders component and theme style sheets.
- Supports color scheme, contrast, and theme variants for style sheets.
- Renders font faces, keyframes, and CSS imports.
- Handles server-side rendering _and_ client-side hydration.
- Integrates with the [React](https://www.npmjs.com/package/@aesthetic/react) framework.

## Requirements

- IE 11+

## Installation

```
yarn add @aesthetic/core
```

## Documentation

[https://aestheticsuite.dev](https://aestheticsuite.dev)