NxAppWebpackPlugin outputFileName option does not work as expected

[tbinna]

Current Behavior

If you use the NxAppWebpackPlugin in a project with the outputFileName option to rename the output file, you always get two files, a main.js and whatever is configured in the outputFileName.

Expected Behavior

I'd expect to only get one file in the output that matches the option in outputFileName, instead of an additional main.js.

GitHub Repo

/~https://github.com/tbinna/nx-webpack-test

Steps to Reproduce

The repository includes a workspace with the default node application generator output. The only change I made is to add the outputFileName option to have the output named index.js instead of main.js.

1. run nx build node-app
2. go to dist/apps/node-app, where there is now an index.js and a main.js file

Nx Report

Node   : 20.13.1
OS     : darwin-arm64
npm    : 10.5.2

nx (global)        : 19.2.0
nx                 : 19.2.1
@nx/js             : 19.2.1
@nx/jest           : 19.2.1
@nx/linter         : 19.2.1
@nx/eslint         : 19.2.1
@nx/workspace      : 19.2.1
@nx/devkit         : 19.2.1
@nx/eslint-plugin  : 19.2.1
@nx/node           : 19.2.1
@nrwl/tao          : 19.2.1
@nx/web            : 19.2.1
@nx/webpack        : 19.2.1
typescript         : 5.4.5
---------------------------------------
Registered Plugins:
@nx/webpack/plugin
@nx/eslint/plugin
@nx/jest/plugin

Failure Logs

No response

Package Manager Version

No response

Operating System

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

Additional Information

I have been debugging this issue and managed to trace it to the call of applyBaseConfig. The second argument to this call, compiler.options contains a default entry for main. The Nx plugin will append any entries it calculates to the existing entries, which means if we rename the output, we always get the default main plus any other entries that the plugin added.

Below is the debug console for that particular call, which shows the default main entry.

[github-actions]

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[github-actions]

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