<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=389096) </details> <!--IssueSummary end--> ### Problem There are two separate parser implementations for codeowners feature: 1. https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/gitlab/code_owners/file.rb 2. https://gitlab.com/gitlab-com/www-gitlab-com/-/blob/master/lib/code_owners/file.rb It leads to inconsistency and makes it harder to maintain both versions ### Proposal Extract common functionality into a gem ### Challenges 1. GitLab and Handbook projects have different structure and dependencies. For instance, Handbook does not have a direct access to database, does not support feature flags and caches.