"(!) Broken sourcemap" when enabling rollup sourcemaps

[ThePlenkov]

Current Behavior

Hi!

I want to use sourcemaps with rollup and enabled them like this in rollup config:

withNx({
  main: './src/index.ts',
  outputPath: './dist',
  tsConfig: './tsconfig.lib.json',
  compiler: 'swc',
  format: ['esm'],
  sourceMap: true,
});

When I build I have a following message

rollup v4.34.6
bundles /workspaces/codygen/packages/codygen/src/index.ts → dist...
  index.esm.js 8.112 KB
(!) Broken sourcemap
https://rollupjs.org/troubleshooting/#warning-sourcemap-is-likely-to-be-incorrect
Plugins that transform code (such as "nx-swc") should generate accompanying sourcemaps.
created dist in 1.5s

[2025-02-13 12:32:51] waiting for changes...

Do you know why? Is it a bug? Thanks!

Expected Behavior

Well I assume rollup should not give such a warning. I guess something went wrong.

GitHub Repo

No response

Steps to Reproduce

1. Clone https://github.com/theplenkov-npm/codygen/tree/main
2. npm install
3. npx nx build codygen

Nx Report

NX   Report complete - copy this into the issue template

Node           : 22.12.0
OS             : linux-x64
Native Target  : x86_64-linux
npm            : 10.9.0

nx                 : 20.4.2
@nx/js             : 20.4.2
@nx/eslint         : 20.4.2
@nx/workspace      : 20.4.2
@nx/devkit         : 20.4.2
@nx/eslint-plugin  : 20.4.2
@nx/rollup         : 20.4.2
@nx/vite           : 20.4.2
@nx/web            : 20.4.2
typescript         : 5.7.3
---------------------------------------
Registered Plugins:
@nx/js/typescript
@nx/rollup/plugin
@nx/eslint/plugin
@nx/vite/plugin

Failure Logs

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

No response