Require node18 in package.json and as babel target version

Author: alex-friedl

.babelrc

@@ -4,7 +4,7 @@
       "@babel/preset-env",
       {
         "targets": {
-          "node": "14"
+          "node": "18"
         }
       }
     ]

.github/copilot-instructions.md

@@ -16,7 +16,7 @@ This repository implements a Node.js module for sending push notifications acros
 
 ## Developer Workflows
 
-- **Install:** `npm install`
+- **Install:** `npm install` (requires Node.js 18+)
 - **Test:** Run all tests with `npm test`. Tests are in `test/` and cover basic flows and platform-specific cases.
 - **Debug:** Use the callback or Promise error/result from `push.send`. Each result object includes method, success/failure counts, and error details per device.
 - **Build:** No build step required for basic usage. ES6 is used, but compatible with ES5 via Babel if needed.

package.json

@@ -78,7 +78,7 @@
     "sinon-chai": "3.5.0"
   },
   "engines": {
-    "node": ">=14.x.x"
+    "node": ">=18.x.x"
   },
   "eslintConfig": {
     "ecmaVersion": 6,