Introduce rule for cyclomatic complexity

[arendjr]

I would like Rome to have a lint rule that can enforce a maximum cyclomatic complexity.

At my work we heavily rely on this rule with ESLint in order to flag when it’s time to refactor/split a function because it’s becoming too complex.

Prior art:

• https://github.com/SonarSource/eslint-plugin-sonarjs/blob/HEAD/docs/rules/cognitive-complexity.md
• https://eslint.org/docs/latest/rules/complexity

[xunilrj]

Is this the paper describing "Cognitive Complexity"? https://www.sonarsource.com/docs/CognitiveComplexity.pdf

[arendjr]

Yes, I believe that’s the one the SonarJS implementation is based on. It suggests a number of improvements over simple cyclomatic complexity, as used by the stock ESLint rule.

[arendjr]

It's not yet done, but I've started implementation of this in my branch: https://github.com/arendjr/rome-tools/tree/cognitive-complexity

[arendjr]

Update: the PR is here: #4657

[arendjr]

Rule is merged :)