Drupal Core Metrics

Magic keys: #-prefixed array keys require memorization and lack IDE support. Inherent to Drupal's render array architecture.
Deep arrays: arrays nested 3+ levels deep are hard to read and refactor.
Service locators: \\Drupal::service() calls hide dependencies and hinder testing.

The charts below tell the story of a changing code base.

Code quality has improved since Drupal 7: lower complexity, fewer anti-patterns, better architecture, and better test coverage. The API surface has also modernized: global functions were replaced by interface methods, services, plugins, and events, shifting from procedural to object-oriented patterns.

By tracking these metrics, we hope to inform decisions about both code quality and developer experience.

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