[FR]: ability to exclude subsets of fetched npm packages

[jbedard]

What is the current behavior?

Many packages ship with unnecessary content such as tests, test data etc that must then be copied throughout actions.

Describe the feature

An API to enable excluding files from the package target so they don't get copied around within bazel.

The excluding would most likely be done post-extraction to ensure the package on disk is the exactly as downloaded, only the bazel targets wrapping that package will contain the exclusions.

[alexeagle]

As an example, 295efe3 shows how to exclude from a package using lifecycle hooks. Was needed to workaround this error:

ERROR: /workspaces/rt_development/BUILD.bazel:6:22: Running lifecycle hooks on npm package [email protected]_t2g22a3cflk65wz3kqpekiolbu failed: error traversing directory '@@aspect_rules_js~~npm~npm_deps__nodegit__0.28.0-alpha.11__t2g22a3cflk65wz3kqpekiolbu//:package': Error while traversing directory package/vendor/libgit2/tests/resources/status: /home/rt_user/.cache/bazel/_bazel_rt_user/d851f08fd6ebe652ee1e63dd37aa0d3d/external/aspect_rules_js~~npm~npm_deps__nodegit__0.28.0-alpha.11__t2g22a3cflk65wz3kqpekiolbu/package/vendor/libgit2/tests/resources/status/这 (No such file or directory)