diff --git a/cjs-package.json b/cjs-package.json
new file mode 100644
index 0000000..b731bd6
--- /dev/null
+++ b/cjs-package.json
@@ -0,0 +1 @@
+{"type": "commonjs"}
diff --git a/cjs/package.json b/cjs/package.json
index 90c11b8..b731bd6 100644
--- a/cjs/package.json
+++ b/cjs/package.json
@@ -1 +1 @@
-{"type": "commonjs"}  
+{"type": "commonjs"}
diff --git a/esm-package.json b/esm-package.json
new file mode 100644
index 0000000..6990891
--- /dev/null
+++ b/esm-package.json
@@ -0,0 +1 @@
+{"type": "module"}
diff --git a/esm/package.json b/esm/package.json
index b89a8b3..6990891 100644
--- a/esm/package.json
+++ b/esm/package.json
@@ -1 +1 @@
-{"type": "module"} 
+{"type": "module"}
diff --git a/package-lock.json b/package-lock.json
index a5a0c1c..4bb24d8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,6 +22,7 @@
         "eslint": "^9.17.0",
         "markdownlint-cli2": "^0.17.1",
         "minimist": "^1.2.8",
+        "ncp": "^2.0.0",
         "prettier": "3.4.2",
         "supports-color": "^10.0.0",
         "typescript": "^5.7.2",
@@ -2146,6 +2147,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/ncp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ncp/-/ncp-2.0.0.tgz",
+      "integrity": "sha512-zIdGUrPRFTUELUvr3Gmc7KZ2Sw/h1PiVM0Af/oHB6zgnV1ikqSfRk+TOufi79aHYCW3NiOXmr1BP5nWbzojLaA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "ncp": "bin/ncp"
+      }
+    },
     "node_modules/node-gyp-build": {
       "version": "4.8.4",
       "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-4.8.4.tgz",
diff --git a/package.json b/package.json
index 7e9b294..8ed4991 100644
--- a/package.json
+++ b/package.json
@@ -73,7 +73,7 @@
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "tsc --module commonjs --moduleResolution classic --outDir cjs/ && echo {\"type\": \"commonjs\"} > cjs/package.json && tsc --outDir esm/ && echo {\"type\": \"module\"} > esm/package.json",
+    "build": "tsc --module commonjs --moduleResolution classic --outDir cjs/ && ncp cjs-package.json cjs/package.json && tsc --outDir esm/ && ncp esm-package.json esm/package.json",
     "example": "tsc && node esm/example.js",
     "lint": "eslint . && prettier . --check && markdownlint-cli2 **/*.md",
     "lint:fix": "eslint . --fix && prettier . --write && markdownlint-cli2 --fix **/*.md",
@@ -93,6 +93,7 @@
     "eslint": "^9.17.0",
     "markdownlint-cli2": "^0.17.1",
     "minimist": "^1.2.8",
+    "ncp": "^2.0.0",
     "prettier": "3.4.2",
     "supports-color": "^10.0.0",
     "typescript": "^5.7.2",