Can we add support for reading from rush.json? I'm happy to submit a PR if it'd be likely to merge.

as for now im getting this error
TypeError: Error while loading rule 'monorepo/no-internal-import': packageSpecs.reduce is not a function

I noticed the eslint-plugin-import started failing after I upgraded to lerna 7 which removes the useWorkspaces flag

This package I think detects the useWorkspaces flag to find packages though

I can keep the useWorkspaces flag in my lerna.json but note that lerna has a "lerna.json fixer script" that removes this flag

I don't think it is needed, at all. Also, it's slow no matter it uses fast-glob under the hood.

I recently needed and implemented such thing. I remove the /* from given workspaces, then just readdir.

pkg.workspaces
    .map((x) => x.slice(0, -2))
    .filter(Boolean)
    .reduce((acc, ws) => {
      const workspace = path.join(cwd, ws);
      const packages = fs
        .readdirSync(workspace)
        .map((dir) => {
          const pkgDir = path.join(workspace, dir);
          const pkgJsonPath = path.join(pkgDir, 'package.json');

          return { pkgDir, pkgJsonPath };
        })
        .map(({ pkgDir, pkgJsonPath }) => {
          // eslint-disable-next-line global-require, import/no-dynamic-require
          const pkgJson = require(pkgJsonPath);
          return { pkgDir, pkgJson };
        });

      return acc.concat(packages);
    }, [])

pnpm is being more and more popular so it would be nice that we support https://pnpm.io/workspaces