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Revert "feat: support passive event options by defining global variables in zone.js config file (#34503)"

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This reverts commit d7d359e3ee.
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Miško Hevery
2020-02-21 22:16:34 +00:00
parent e17bde99f8
commit e084835fb1
5 changed files with 9 additions and 97 deletions
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aio/content/guide/user-input.md
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@ -297,24 +297,7 @@ Following is all the code discussed in this page.
</code-tabs>
### Passive events
Angular also support passive event listeners. For example, we can use the following steps to make scroll event passive.
1. create a file `src/zone-flags.ts`.
2. add the following line into this file.
```
(window as any)['__zone_symbol__PASSIVE_EVENTS'] = ['scroll'];
```
3. in `src/polyfills.ts`, before import zone.js, import the new created `zone-flags`.
```
import './zone-flags';
import 'zone.js/dist/zone'; // Included with Angular CLI.
```
after those steps, if user add event listeners for the `passive` event, the listeners will be `passive`.
## Summary