Add type declaration (#118)

* Add type declaration

* update types

- This way it doesn't rely on the `@types/tailwindcss` Definetely Typed
  repo which could cause issues when we release Tailwind CSS 3.1 with
  our own types.
- Use `export = plugin` instead of `export default plugin` so that it is
  compatible with `module.export`

Co-authored-by: Marcus Zanona <marcus@zanona.co>

Author: RobinMalfait

package.json

@@ -2,6 +2,7 @@
   "name": "@tailwindcss/forms",
   "version": "0.5.1",
   "main": "src/index.js",
+  "types": "src/index.d.ts",
   "license": "MIT",
   "repository": "https://github.com/tailwindlabs/tailwindcss-forms",
   "publishConfig": {

src/index.d.ts

@@ -0,0 +1,2 @@
+declare function plugin(options?: { strategy?: 'base' | 'class' }): Function
+export = plugin