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Before Zone.js `v0.11.1`, Zone.js provides two format of bundles under `dist` folder, `ES5` bundle `zone.js` and `ES2015` bundle `zone-evergreen.js`, these bundles are used for `differential loading` of Angular. By default, the following code ``` import 'zone.js'; ``` loads the `ES5` bundle `zone.js`. From `v0.11.1`, Zone.js follows the [Angular Package Format] (https://docs.google.com/document/d/1CZC2rcpxffTDfRDs6p1cfbmKNLA6x5O-NtkJglDaBVs), so the folder structure of the Zone.js bundles is updated to match `Angular Package Format`. So the same code ``` import 'zone.js'; ``` loads the `ES2015` bundle. This is a breaking change, so if the apps import zone.js in this way, the apps will not work in legacy browsers such as `IE11`. Zone.js still provides the same bundles under `dist` folder to keep backward compatibility after `v0.11.1`. So the following code in `polyfills.ts` generated by `Angular CLI` still works. ``` import 'zone.js/dist/zone'; ``` For details, please refer the [changelog](./CHANGELOG.md) and the [PR](https://github.com/angular/angular/pull/36540). PR Close #38821
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