ReferenceError: module is not defined in ES module scope

Hello everyone, I’m building a serverless cron job on DigitalOcean Functions (using Node.js 18) and I’m stuck on a persistent ReferenceError: module is not defined in ES module scope.

One of my functions (userDetails) works perfectly, but my cron job function (notifications) consistently fails with this error. The key difference is that the notifications function has a more complex dependency graph.

although the code is working fine at local enviroment just failing at do-functions

The Root Cause As I Understand It

1. My project is built as a modern ES Module.

2. The bundler (esbuild) gets confused by this chain (ESM -> CJS -> CJS) and produces a broken bundle that crashes in the strict ESM environment on DigitalOcean.

this is my folder structure src functions notifications.ts

import { notifications } from "../services/notifications.service";

export async function main(args: any) {
  await notifications();
  return {
    statusCode: 200,
    body: JSON.stringify({ message: "Job completed successfully" }),
  };
}`

Project.yml

packages:
  - name: pi-service
    functions:
      - name: cron-job-for-daily-notifications
        runtime: nodejs:18
        main: main
        file: dist/notifications.js
        triggers:
          - name: run-daily
            sourceType: scheduler
            sourceDetails:
              cron: "*/5 * * * *"

My Question is how do i make it work for DO-Functions

package.json

  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "tsc",
    "bundle": "esbuild src/functions/*.ts --bundle --platform=node --target=node18 --external:uglify-js --outdir=dist",
    "start:local": "npm run build && cross-env dotenv_config_path=./env/.env.dev node -r dotenv/config dist/local-dev.js",
    "deploy:prod": "npm run build && npx serverless deploy --stage prod",
    "deploy": "npm run bundle && doctl serverless deploy ."
  },

tsconfig.json

"target": "es2022",
    "sourceMap": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "outDir": "./dist",
    "rootDir": "src",
    "strict": true,
    "esModuleInterop": true,
    "baseUrl": ".",