This PR implements the first version of JS config file migration to CSS.
It is based on the most simple config setups we are using in the
Tailwind UI templates Commit, Primer, Radiant, and Studio.
The example we use in the integration test is a config that looks like
this:
```js
import { type Config } from 'tailwindcss'
import defaultTheme from 'tailwindcss/defaultTheme'
module.exports = {
darkMode: 'selector',
content: ['./src/**/*.{html,js}'],
theme: {
boxShadow: {
sm: '0 2px 6px rgb(15 23 42 / 0.08)',
},
colors: {
red: {
500: '#ef4444',
},
},
fontSize: {
xs: ['0.75rem', { lineHeight: '1rem' }],
sm: ['0.875rem', { lineHeight: '1.5rem' }],
base: ['1rem', { lineHeight: '2rem' }],
},
extend: {
colors: {
red: {
600: '#dc2626',
},
},
fontFamily: {
sans: 'Inter, system-ui, sans-serif',
display: ['Cabinet Grotesk', ...defaultTheme.fontFamily.sans],
},
borderRadius: {
'4xl': '2rem',
},
},
},
plugins: [],
} satisfies Config
```
As you can see, this file only has a `darkMode` selector, custom
`content` globs, a `theme` (with some theme keys being overwriting the
default theme and some others extending the defaults). Note that it does
not support `plugins` and/or `presets` yet.
In the case above, we will find the CSS file containing the existing
`@tailwind` directives and are migrating it to the following:
```css
@import 'tailwindcss';
@source './**/*.{html,js}';
@variant dark (&:where(.dark, .dark *));
@theme {
--box-shadow-*: initial;
--box-shadow-sm: 0 2px 6px rgb(15 23 42 / 0.08);
--color-*: initial;
--color-red-500: #ef4444;
--font-size-*: initial;
--font-size-xs: 0.75rem;
--font-size-xs--line-height: 1rem;
--font-size-sm: 0.875rem;
--font-size-sm--line-height: 1.5rem;
--font-size-base: 1rem;
--font-size-base--line-height: 2rem;
--color-red-600: #dc2626;
--font-family-sans: Inter, system-ui, sans-serif;
--font-family-display: Cabinet Grotesk, ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
--border-radius-4xl: 2rem;
}
```
This replicates all features of the JS config so we can even delete the
existing JS config in this case.
---------
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>
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