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For folks using bazel, there is also [bazel-watcher][1]. Also worth checking out [watchman][2] for this style of workflow in general.

Bazel is awesome, it just runs way too many tests to be fast enough

It sounds like your bazel packages might be too large then.

Bazel (and bazel watcher) really shines when you have lots of small packages.

--test_filter?

That's sending a human to do a robot's job.