feat(monorepo-tools): allow single repo COMPASS-10984

[esvm]

Description

I'll be making use of the bump-packages script in https://github.com/mongodb-js/electron-wix-msi/.
Today, this script requires a workspace to exist, but that only makes sense for monorepos with multiple packages.

I'm changing the script to allow a fallback to the root dir in case the workspaces is not defined in package.json.

Testing

• Unit tests
• Manual tests in the repo I want to use it

Open Questions

Checklist

• I have signed the Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)
• New tests and/or benchmarks are included
• Documentation is changed or added

[Copilot]

🟢 Approval recommended

The requested fallback and unit coverage are included, with no unresolved review issues.

Pull request overview

Adds support for single-package repositories by treating the repository root as the default package when workspaces is absent.

Changes:

• Defaults workspace patterns to ['.'].
• Adds unit coverage for repositories without workspaces.

File summaries

File	Description
packages/monorepo-tools/src/utils/get-packages-in-topological-order.ts	Adds root-package fallback behavior.
packages/monorepo-tools/src/utils/get-packages-in-topological-order.spec.ts	Tests single-repository discovery.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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[gribnoysup]

Not sure if there's any documentation we might want to adjust also, code change lgtm 🙂

[coveralls]

Coverage is 78.161% — COMPASS-10984-allow-single-repo into main. No base build found for main.