Added typescript types to package exports (#27)

Author: AntoonBeres

package.json

@@ -25,7 +25,10 @@
  "exports": {
  ".": {
  "import": "./dist/index.mjs",
- "require": "./dist/index.cjs"
+ "require": "./dist/index.cjs",
+ "types": {
+ "default": "./dist/index.d.ts"
+ }
  }
  },
  "main": "./dist/index.cjs",