11 days ago
Description
A common "Works on my machine" issue
I can build and run it locally on my PC.
This is a Micro service nest.js project with multiple apps.
I have deployed them separately and it builds with no issue.
However when it tries to deploy it causes an ESM issue,
I have tried to use dynamic import, downgraded p-throttle to a version where it had the CJS (version 4) but that did not fix it.
I have even tried to use "const pThrottle = require("p-throttle").default;"
But i still get the same issue.
According to my "AI" buddy it pointing towards Railways default config for webpack. But i have no clue if it is hallucinating.
I have checked my nest-cli.json and i have webpack = true in the compilerOptions and it does not get overwritten in the app it runs.
Code -- (nest.js) project
```
import pThrottle from 'p-throttle';
@Injectable()
export class SomeService {
private throttle = pThrottle({
limit: RATE_LIMIT_PER_SECOND,
interval: 1000,
});
}
```
Local machine.
- Linux Arch,
- Node version v22.14.0
A kollege of mine have WSL (Ubuntu) with the same node version and it runs on his PC aswell.
Logs from deployment
```
/app/dist/apps/object-processor/main.js:315
/* 8 */
^
Error [ERR_REQUIRE_ESM]: require() of ES Module /app/node_modules/.pnpm/p-throttle@7.0.0/node_modules/p-throttle/index.js from /app/dist/apps/object-processor/main.js not supported.
Instead change the require of index.js in /app/dist/apps/object-processor/main.js to a dynamic import() which is available in all CommonJS modules.
at TracingChannel.traceSync (node:diagnostics_channel:315:14)
at Object.__decorate (/app/dist/apps/object-processor/main.js:395:18)
at __webpack_require__ (/app/dist/apps/object-processor/main.js:1601:42)
at Object.<anonymous> (/app/dist/apps/object-processor/main.js:183:22) {
code: 'ERR_REQUIRE_ESM'
}
Node.js v22.11.0
```
2 Replies
11 days ago
Hi,
you can run Railpack locally, so it might be easier to track down the root cause of the problem:
https://railpack.com/getting-started
Do you have set
"type": "module"in your package.json, so Node defaults to ESM?
Another option would be to provide a dedicated Dockerfile in your project which gives you a controllable environment and usually uses less resources than the builds provided by Railpack / Nixpack.
A quick start could look something like this:
FROM node:lts-alpine
USER node
WORKDIR /home/node
COPY --chown=node:node package.json package-lock.json ./
RUN npm install && npm cache clean --force
COPY --chown=node:node . ./
RUN npm run build
CMD ["npm","start"]9 days ago
Hey mjablonski,
Thank you for your advice!
I did not set "type": "module".
But i went with the docker route, First i had to learn on how to create a fully functionall dockerfile, which was interersting! 
But now it runs!
Status changed to Solved brody • 9 days ago