eslint rules not applied after migrating to flat config

[philipjfulcher]

Current Behavior

After migrating to eslint flat config, eslint rules are not applied.

Expected Behavior

After migrating to flat config, eslint rules are applied as before.

GitHub Repo

https://github.com/philipjfulcher/eslint-flat-config-repro

Steps to Reproduce

1. Clone https://github.com/philipjfulcher/eslint-flat-config-repro and install packages
2. Run npx nx lint eslint-repro and note that there is an error and warning in apps/eslint-repro/src/app/app.component.ts
3. Checkout branch flat-config where flat config migration generator has been run
4. Run npx nx lint eslint-repro and note that it passes with no errors or warnings.
5. Checkout branch flat-config-working where empty rulesets have been removed from eslint.config.js
6. Run npx nx lint eslint-repro and note that there is an error and warning in apps/eslint-repro/src/app/app.component.ts

Nx Report

NX   Report complete - copy this into the issue template

Node   : 20.11.1
OS     : darwin-arm64
npm    : 10.2.4

nx                 : 18.2.4
@nx/js             : 18.2.4
@nx/jest           : 18.2.4
@nx/linter         : 18.2.4
@nx/eslint         : 18.2.4
@nx/workspace      : 18.2.4
@nx/angular        : 18.2.4
@nx/devkit         : 18.2.4
@nx/eslint-plugin  : 18.2.4
@nx/plugin         : 18.2.4
@nrwl/tao          : 18.2.4
@nx/web            : 18.2.4
@nx/webpack        : 18.2.4
typescript         : 5.4.5

Failure Logs

No response

Package Manager Version

No response

Operating System

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

Additional Information

Using rules: {} seems to remove all of the rules from the extended config.