See:
https://www.tomasvotruba.cz/blog/2018/05/21/is-your-code-readable-by-humans-cognitive-complexity-tells-you/#3-steps-to-check-cognitive-complexity-of-your-code
https://blog.sonarsource.com/cognitive-complexity-because-testability-understandability
https://sonarsource.com/docs/CognitiveComplexity.pdf

Already implemented we can migrate to our repository:
deprecated-packages/symplify#823