This PR fixes an issue when loading (nested) colors from a config file
and later referencing it via the `theme(…)` function in CSS.
Given a config like this:
```js
module.exports = {
theme: {
colors: {
foo: 'var(--foo-foo)',
'foo-bar': 'var(--foo-foo-bar)',
},
},
}
```
We internally map this into the design system. The issue here is that
the `foo` and `foo-bar` are overlapping and it behaves more like this:
```js
{
foo: {
DEFAULT: 'var(--foo-foo)',
bar: 'var(--foo-foo-bar)'
},
}
```
So while we can easily resolve `colors.foo-bar`, the `colors.foo` would
result in the object with a `DEFAULT` key. This PR solves that by using
the `DEFAULT` key if we end up with an object that has it.
If you end up resolving an object (`theme(colors)`) then the behavior is
unchanged.
## Test plan
1. Added a test based on the config in the issue (which failed before
this fix).
2. Also simplified the test case after identifying the problem (with the
`DEFAULT` key).
Fixes: #19091
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| @tailwindcss-browser | ||
| @tailwindcss-cli | ||
| @tailwindcss-node | ||
| @tailwindcss-postcss | ||
| @tailwindcss-standalone | ||
| @tailwindcss-upgrade | ||
| @tailwindcss-vite | ||
| internal-example-plugin | ||
| tailwindcss | ||
| tsconfig.base.json | ||