Fix missing "type": "commonjs" in dist/cjs directory

Author: wojtekmaj

package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "build": "yarn build-esm && yarn build-cjs",
     "build-esm": "tsc --project tsconfig.build.json --outDir dist/esm --module esnext",
-    "build-cjs": "tsc --project tsconfig.build.json --outDir dist/cjs --module commonjs",
+    "build-cjs": "tsc --project tsconfig.build.json --outDir dist/cjs --module commonjs && echo '{\n  \"type\": \"commonjs\"\n}' > dist/cjs/package.json",
     "clean": "rimraf dist",
     "lint": "eslint .",
     "postinstall": "husky install",