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rollup-demo1/dist.js

@@ -0,0 +1,5 @@
+function logA() {
+  console.log('function logA called');
+}
+
+logA();

package-lock.json → 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",

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"
+  }
 }