What a monorepo is
A monorepo stores multiple applications, services or packages in one Git repository. GitHub can host monorepos, but repository rules and CI design need to account for multiple areas changing independently.
Path-based ownership and checks
CODEOWNERS can assign responsibility by directory. CI can use path filters or affected-project detection so a documentation-only change does not unnecessarily rebuild every application.
Repository scale
Large monorepos require attention to dependency management, CI duration, checkout size and developer tooling. GitHub is only one part of the architecture; the build system also needs to understand the repository structure.
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