he/him 
@yarnpkg users: do you ever actually use the "offline cache" at all?
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follow-up question: is it helpful? why? why not just commit node_modules?
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It exists to decrease pressure on source control when you have tens of thousands of files. Offline mirror is just tarballs for that reason.
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doesn't git handle tiny files just fine?
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Yeah it does but if you have a large enough codebase then you'll have a lot of deps, whenever you upgrade them then they still need to hang around in the source control history. At FB there's a single Yarn "offline cache" per monorepo that contains everything for all projects.
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Also no idea why it was marketed as something specifically for "offline usage", because that was never really the intent
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