Bug Fixes
- ng-packagr: defer watch invalidation until the running build completes (2922948), closes #3477
- ng-packagr: enable dts tree-shaking and optimize dts bundling (3f72cd0), closes #3471
- ng-packagr: rebase every url() in a Sass stylesheet (0150b47)
- ng-packagr: rebase url() with hyphen-namespaced Sass variables (5c2d4a1)