What does the "rc" in a npm package version structure

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I was wondering what the rc in 2.2.0-rc.0 stands for. Does it mean that its production ready?

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Corvus Crypto On BEST ANSWER

It means it is a release candidate. meaning it is ready to go out, but it isn't proven yet so it's not ready to be marked as a stable release quite yet. You can think of it as a mature beta release.

If no bugs are found and it is deemed (by the developers/community) to be stable it can be marked as a full release.

https://en.wikipedia.org/wiki/Software_release_life_cycle

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William Carron On

Generally it means, "release candidate", meaning it's not production ready, but nearly so, and is generally dispensed with the intention that early-adopters/users will file/fix bugs and issues to test the software.