fix(material/core): reduce the number of module resolutions required for the legacy theming bundle #22687
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…for the legacy theming bundle Currently the legacy `material/theming` bundle is set up to forward a few top-level `.import` files. The problem is that those files have been auto-generated to be backwards-compatible even for deep imports which means that they have a lot of overlapping `@forward` and `@import` statements. This results in a significant increase in build times for consumers still using the old bundle. These changes address the issue by introducing new shallower `*-legacy-index.scss` files which only export the APIs from the specific package and which in turn are re-exported through the top-level `material/theming` file. The change appears to cut the down the production build time on material.angular.io before the @use migration by more than 60%. Fixes angular#22676.
…quired for the legacy theming bundle
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Currently the legacy
material/themingbundle is set up to forward a few top-level.importfiles. The problem is that those files have been auto-generated to be backwards-compatible even for deep imports which means that they have a lot of overlapping@forwardand@importstatements. This results in a significant increase in build times for consumers still using the old bundle.These changes address the issue by introducing new shallower
*-legacy-index.scssfiles which only export the APIs from the specific package and which in turn are re-exported through the top-levelmaterial/themingfile. The change appears to cut the down the production build time on material.angular.io before the @use migration by more than 60%.Fixes #22676.