Only emit aspect_rules_js_metadata when it's required #1420
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Type of change
- Performance (a code change that improves performance)
Test plan
- Covered by existing test cases
My understanding is this file is only consumed by actions with a non-empty file, so writing an empty one is unnecessary. This saves 2.5% of files in the npm runfiles tree on typical test actions which translates to a small improvement in test runtime.
As another datapoint, in bazelbuild/bazel#8230 (comment) I computed that the average NPM package we use has around 45 files. 44/45 = 97.8% :)