Switch to ESM-only package

package.json

@@ -1,21 +1,13 @@
 {
   "name": "kysely-planetscale",
   "version": "0.2.1",
+  "type": "module",
   "description": "Kysely dialect for PlanetScale Serverless",
   "repository": "https://github.com/depot/kysely-planetscale.git",
   "homepage": "https://github.com/depot/kysely-planetscale",
   "author": "Jacob Gillespie <[email protected]>",
   "license": "MIT",
-  "main": "./dist/index.js",
-  "module": "./dist/index.mjs",
-  "exports": {
-    ".": {
-      "import": "./dist/index.mjs",
-      "require": "./dist/index.js",
-      "types": "./dist/index.d.ts"
-    },
-    "./package.json": "./package.json"
-  },
+  "main": "./dist/index.mjs",
   "types": "./dist/index.d.ts",
   "files": [
     "dist"
@@ -28,7 +20,7 @@
     "serverless"
   ],
   "scripts": {
-    "build": "tsup src/index.ts --format cjs,esm --dts --clean",
+    "build": "tsup src/index.ts --format esm --dts --clean",
     "clean": "rm -rf dist",
     "fmt": "prettier --write .",
     "fmt:check": "prettier --check .",