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A star pattern still has most of the downsides of the multirepo approach. Specifically, it has the problem of needing a parallel version control (e.g. SemVer) on top of your individual repositories. This creates fragmentation, where different applications have dependencies on different versions of the libraries which ends up in dependency hell, technical debt, and CI hell.

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An alternative would be to have a policy where all the app repos must use the same version (nobody can upgrade until they all upgrade). This makes things harder for the library maintainers, but no more than a monorepo.

I don't see why you'd need semver. The apps could sync to a particular commit in the library repo.

What you propose is just a fake monorepo, containing the global policy of allowed version of X, disguised as multiple subrepos. OP discusses this.

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