chore(package): explicitly declare js module type (#299)

Co-authored-by: JounQin <[email protected]>

Author: Fdawgs

.changeset/six-dolls-itch.md

@@ -0,0 +1,5 @@
+---
+"eslint-config-prettier": patch
+---
+
+chore(package): explicitly declare js module type

package.json

@@ -7,6 +7,7 @@
   "repository": "prettier/eslint-config-prettier",
   "bin": "build/bin/cli.js",
   "main": "build/index.js",
+  "type": "commonjs",
   "files": [
     "build"
   ],