@nx/dependency-checks produces false positives in npm workspace children that have their own nx.json

[piotretm]

Current Behavior

When using npm workspaces with multiple Nx workspace roots (each child workspace has its own nx.json), the @nx/dependency-checks ESLint rule reports all dependencies as unused. Every dependency in every library's
package.json gets flagged with "<package>" is not used.

Expected Behavior

@nx/dependency-checks should be able to resolve npm dependencies against the lockfile even when the Nx workspace root differs from the npm workspace root (i.e., the lockfile lives in a parent directory).

GitHub Repo

No response

Steps to Reproduce

1. Create a monorepo with npm workspaces
2. Add nx.json to a child workspace (e.g., frontend/lit/nx.json)
3. Enable @nx/dependency-checks in that child workspace's ESLint config
4. Run ESLint from the child workspace: cd frontend/lit && npx eslint libs/my-lib/package.json
5. All dependencies are reported as unused

 ├── package.json                   ← workspaces: ["frontend/lit", "frontend/app"]
 ├── package-lock.json              ← single lockfile for all workspaces
 ├── nx.json                        ← root Nx workspace (optional)
 │
 └── frontend/lit/                  ← npm workspace child
     ├── nx.json                    ← nested Nx workspace root
     ├── package.json
     ├── .eslintrc.json             ← enables @nx/dependency-checks
     └── libs/
         └── my-lib/
             ├── package.json       ← declares dependencies (lit, rxjs, etc.)
             └── src/
                 └── index.ts       ← imports lit, rxjs, etc.```

### Nx Report

```shell
NX   Report complete - copy this into the issue template

Node           : 22.22.2
OS             : linux-x64
Native Target  : x86_64-linux
npm            : 10.9.7

nx                     : 21.6.10
@nx/js                 : 21.6.10
@nx/jest               : 21.6.10
@nx/eslint             : 21.6.10
@nx/workspace          : 21.6.10
@nx/angular            : 21.6.10
@nx/cypress            : 21.6.10
@nx/devkit             : 21.6.10
@nx/eslint-plugin      : 21.6.10
@nx/module-federation  : 21.6.10
@nx/playwright         : 21.6.10
@nx/plugin             : 21.6.10
@nx/storybook          : 21.6.10
@nx/vite               : 21.6.10
@nx/web                : 21.6.10
@nx/webpack            : 21.6.10
typescript             : 5.9.3
---------------------------------------
Cache Usage: 0.00 B / 100.69 GB

Failure Logs

Package Manager Version

npm --version 10.9.7

Operating System

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

Additional Information

No response