diff --git a/rollup-demo1/dist.js b/rollup-demo1/dist.js
new file mode 100644
index 0000000..14f9ab4
--- /dev/null
+++ b/rollup-demo1/dist.js
@@ -0,0 +1,5 @@
+function logA() {
+  console.log('function logA called');
+}
+
+logA();
\ No newline at end of file
diff --git a/package-lock.json b/rollup-demo1/package-lock.json
similarity index 96%
rename from package-lock.json
rename to rollup-demo1/package-lock.json
index b4e1f37..5c614b6 100644
--- a/package-lock.json
+++ b/rollup-demo1/package-lock.json
@@ -1,6 +1,8 @@
 {
-  "requires": true,
+  "name": "rollup-demo1",
+  "version": "1.0.0",
   "lockfileVersion": 1,
+  "requires": true,
   "dependencies": {
     "@types/estree": {
       "version": "0.0.39",
diff --git a/rollup-demo1/package.json b/rollup-demo1/package.json
index eab4e5c..a188f92 100644
--- a/rollup-demo1/package.json
+++ b/rollup-demo1/package.json
@@ -4,7 +4,7 @@
   "description": "",
   "main": "main.js",
   "scripts": {
-
+    "build": "rollup main.js -o dist.js -f es"
   },
   "repository": {
     "type": "git",
@@ -12,5 +12,8 @@
   },
   "keywords": [],
   "author": "",
-  "license": "ISC"
+  "license": "ISC",
+  "devDependencies": {
+    "rollup": "^1.27.3"
+  }
 }
\ No newline at end of file