diff --git a/package.json b/package.json
index 6c411f9..5d14f43 100644
--- a/package.json
+++ b/package.json
@@ -32,15 +32,15 @@
     "build-all": "run-s lint clean:* build:*",
     "build:node-cjs": "run-s clean:node-cjs compile:node-cjs pkgjson:node-cjs",
     "compile:node-cjs": "tsc -p ./tsconfig/node-cjs.json",
-    "pkgjson:node-cjs": "node ./scripts/pkg-json.mjs ./tsconfig/node-cjs.json > ./dist/node/cjs/package.json",
+    "pkgjson:node-cjs": "node ./scripts/pkg-json.mjs cjs > ./dist/node/cjs/package.json",
     "clean:node-cjs": "rm -rf dist/node/cjs",
     "build:node-esm": "run-s clean:node-esm compile:node-esm pkgjson:node-esm",
     "compile:node-esm": "tsc -p ./tsconfig/node-esm.json",
-    "pkgjson:node-esm": "node ./scripts/pkg-json.mjs ./tsconfig/node-esm.json > ./dist/node/esm/package.json",
+    "pkgjson:node-esm": "node ./scripts/pkg-json.mjs esm > ./dist/node/esm/package.json",
     "clean:node-esm": "rm -rf dist/node/esm",
     "build:browser": "run-s clean:browser compile:browser pkgjson:browser",
     "compile:browser": "tsc -p ./tsconfig/browser.json",
-    "pkgjson:browser": "node ./scripts/pkg-json.mjs ./tsconfig/browser.json > ./dist/browser/package.json",
+    "pkgjson:browser": "node ./scripts/pkg-json.mjs browser > ./dist/browser/package.json",
     "clean:browser": "rm -rf dist/browser",
     "build:types": "run-s clean:types compile:types",
     "compile:types": "tsc -p ./tsconfig/types.json",
diff --git a/scripts/pkg-json.mjs b/scripts/pkg-json.mjs
index 6e48ff6..1db58d1 100755
--- a/scripts/pkg-json.mjs
+++ b/scripts/pkg-json.mjs
@@ -5,7 +5,19 @@ import path from 'path';
 
 const tsconfigs = [];
 
-let tsConfigPath = process.argv[2];
+const options = {
+  'cjs': './tsconfig/node-cjs.json',
+  'esm': './tsconfig/node-esm.json',
+  'browser': './tsconfig/browser.json'
+};
+
+let option = process.argv[2];
+let tsConfigPath = options[option];
+if (!tsConfigPath)  {
+  console.error('Invalid option');
+  process.exit(1);
+}
+
 let tsConfig = JSON.parse(fs.readFileSync(tsConfigPath, 'utf8'));
 tsconfigs.push(tsConfig);