217db9b216
Within an Angular package, it can happen that there are entry-points which do not contain features that belong into an `@NgModule` or need metadata files to be generated. For example: the `cdk`, `cdk/testing` and `cdk/coercion` entry-points. Besides other entry-points in the `cdk` package, those entry-points do not need metadata to be generated and no not use the `ng_module` rule. Currently the "ng_package" rule properly picks up such entry-points and builds bundles, does downleveling etc. The only thing it misses is that no `package.json` files are generated for the entry-point. This means that consumers will not be able to use these entry-points built with "ts_library" (except accessing the individual bundlings explicitly). The "ng_package" rule should follow the full APF specification for such entry-points. Partially building bundles and doing the downleveling is confusing and a breaking issue. The motifivation of supporting this (besides making the rule behavior consistent; the incomplete output is not acceptable), is that using the "ng_module" rule does not make sense to be used for non-Angular entry-points. Especially since it depends on Angular packages to be specified as Bazel action inputs just to compile vanilla TypeScript with `@angular/compiler-cli`. PR Close #32610
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