fix: use exports conditions (#43)

Author: kettanaito

package.json

@@ -3,8 +3,14 @@
   "name": "@msw/playwright",
   "version": "0.6.4",
   "description": "Mock Service Worker binding for Playwright",
-  "main": "./build/index.js",
-  "types": "./build/index.d.ts",
+  "main": "./build/index.mjs",
+  "types": "./build/index.d.mts",
+  "exports": {
+    ".": {
+      "types": "./build/index.d.mts",
+      "default": "./build/index.mjs"
+    }
+  },
   "scripts": {
     "dev": "tsdown --watch",
     "test": "playwright test",
@@ -60,4 +66,4 @@
     "@mswjs/interceptors": "^0.41.3",
     "outvariant": "^1.4.3"
   }
-}
+}