💡 Flag unused ignore/ignoreDependencies rules

[bigpopakap]

Suggest an idea for this project

I have configured ignoreDependencies and ignore in my project:

• I have some ignore rules to quiet issues that will be solved soon (eg. for a util file that is currently unused, but will be used imminently)
• I have some ignoreDependencies rules for other issues (eg. I ignore "@next/eslint-plugin-next" and "eslint-config-next" because of 🐛 ESLint edge case: flatCompat.extends in FlatConfig files #818)

When these issues are resolved (I use that util function again, or #818 is solved), I'd like to be notified by Knip that my ignore/ignoreDependencies configurations are no longer necessary.

Knip could detect if/when ignoreDependencies: ["@next/eslint-plugin-next"] or ignore: ["lib/myUtil.ts"] don't actually suppress anything, and report this as a warning or error (probably configurable - not everyone will want this).

[webpro]

For ignoreDependencies this already works.

The configuration hints are warnings, not errors indeed.

[webpro]

Unfortunately, as for entry patterns, I expect warnings about unused ignore patterns aren't going to make it in anytime soon.