Feature Request Checklist

• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I want to provide a PR to resolve this

Overview

Mocha currently depends an older major version of diff:

Suggested Solution

diff@7.0.0 is the latest. It'd be nice to bump to that, so users aren't stuck on a dep that's two major versions behind.

Alternatives

This isn't critical and I don't think we need to do it. But it's nice ecosystem cleanup in general.

I don't know of popular alternatives to diff and haven't looked for them.

Additional Info

The diff package is used in example one place internally, the Base reporter class:

diff@7 still supports older Node.js versions than Mocha, so I don't believe we're blocked on that.