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I’ll jump here to say that Bazel 1 was awesome, and I’m looking forward to trying out Bazel 2.

I was wondering how to make sure Bazel doesn’t rebuild something it has built previously? (Caching)

There are many layers of caching within Bazel (remote/local, inmemory/disk), but the central functional incremental engine is called Skyframe [1]. Almost every computation within Bazel that can be incrementally executed is managed in this engine.

[1]: https://bazel.build/designs/skyframe.html

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