I’m encountering a persistent

on Railway:

Code

TS2307: Cannot find module '../../externals/propyleeapi-typescript/dist/index.js'

The module does exist in my build output (externals/propyleeapi-typescript/dist/index.js), and the SDK compiles correctly locally. My Dockerfile uses a multi‑stage build where the SDK is compiled in the builder stage and copied into the runner stage.

Locally:

dist/index.js is present

NodeNext + ESM imports resolve correctly

The project builds without errors

On Railway:

The same path is reported as missing

TS2307 occurs during the TypeScript build step

The file appears not to be visible inside the runner image

I would like to understand why Railway’s build environment cannot resolve a module that exists in the builder stage and is copied into the runner stage. Is there anything specific about Railway’s NodeNext/ESM resolution, Docker layer copying, or filesystem visibility that could explain this discrepancy?

Thank you,

Phi