🚀 feature request

Relevant Package

zone.js

Description

zone.js is missing a sideEffects field in its package.json. I realize it's pretty side-effect-ful, which is probably why the field wasn't added, but I would think it would benefit optimization to have the sideEffects files clearly marked.

Describe the solution you'd like

Please consider adding a correct sideEffects field to zone.js/package.json, or explain why it's not necessary or a bad idea.

From https://angular.io/guide/ivy-compatibility :

Check that imported libraries have been marked side-effect-free. If your app imports from shared libraries that are meant to be free from side effects, add "sideEffects": false to their package.json. This will ensure that the libraries will be properly tree-shaken if they are imported but not directly referenced. See more details in the original issue here.