Update package.json

Author: BOTCAHX

package.json

@@ -12,13 +12,13 @@
       "types": "./dist/index.d.ts"
     }
   },
-  "scripts": {
-    "build": "tsc -p tsconfig.cjs.json && tsc -p tsconfig.esm.json && cp dist/cjs/index.js dist/index.js && cp dist/esm/index.mjs dist/index.mjs && cp dist/cjs/index.d.ts dist/index.d.ts",
-    "start": "node dist/index.js",
-    "test": "jest",
-    "prepublishOnly": "npm run build",
-    "prepare": "npm run build"
-  },
+"scripts": {
+  "build": "tsc -p tsconfig.cjs.json && tsc -p tsconfig.esm.json && test -e dist/esm/index.mjs && mv dist/cjs/index.js dist/index.js && mv dist/esm/index.mjs dist/index.mjs && mv dist/cjs/index.d.ts dist/index.d.ts",
+  "start": "node dist/index.js",
+  "test": "jest",
+  "prepublishOnly": "npm run build",
+  "prepare": "npm run build"
+},
   "files": [
     "dist/",
     "README.md",