cx → clsx (#152)

feat: use clsx instead of bespoke class concatenator

docs/pages/docs/api-reference.mdx

@@ -10,7 +10,7 @@ const component = cva("base", options);
 
 ### Parameters
 
-1. `base`: the base class name (`string`, `string[]` or `null`)
+1. `base`: the base class name (`string`, `string[]` or other [`clsx` value](https://github.com/lukeed/clsx#input))
 1. `options` _(optional)_
    - `variants`: your variants schema
    - `compoundVariants`: variants based on a combination of previously defined variants
@@ -23,15 +23,15 @@ A `cva` component function
 
 ## `cx`
 
-Concatenates class names
+Concatenates class names (an alias of [`clsx`](https://github.com/lukeed/clsx))
 
 ```ts
 const className = cx(classes);
 ```
 
 ### Parameters
 
-- `classes`: array of classes to be concatenated
+- `classes`: array of classes to be concatenated ([see `clsx` usage](https://github.com/lukeed/clsx#input))
 
 ### Returns
 

docs/pages/docs/index.mdx

@@ -22,6 +22,8 @@ Creating variants with the "traditional" CSS approach can become an arduous task
 - [**clb**](https://github.com/crswll/clb) ([Bill Criswell](https://github.com/crswll))  
   This project originally started out with the intention of merging into the wonderful [`clb`](https://github.com/crswll/clb) library, but after some discussion with Bill, we felt it was best to go down the route of a separate project.  
   I'm so grateful to Bill for sharing his work publicly and for getting me excited about building a type-safe variants API for classes. If you have a moment, please go and [star the project on GitHub](https://github.com/crswll/clb). Thank you Bill!
+- [**clsx**](https://github.com/lukeed/clsx) ([Luke Edwards](https://github.com/lukeed))  
+  Previously, this project surfaced a custom `cx` utility for flattening classes, but it lacked the ability to handle variadic arguments or objects. [clsx](https://github.com/lukeed/clsx) provided those extra features with quite literally zero increase to the bundle size – a no-brainer to switch!
 - [**Vanilla Extract**](http://vanilla-extract.style) ([Seek](https://github.com/seek-oss))
 
 ## Downloads

packages/class-variance-authority/package.json

@@ -46,6 +46,9 @@
     "test:jest": "jest --config .config/jest.config.ts --coverage",
     "test:size": "pnpm build && bundlesize -f 'dist/*.js' -s 850B"
   },
+  "dependencies": {
+    "clsx": "1.2.1"
+  },
   "devDependencies": {
     "@jest/types": "28.1.1",
     "@swc/cli": "0.1.57",