| ## Gerrit in Polymer 3 |
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| Gerrit has migrated to polymer 3 as of submitted of submitted of https://gerrit-review.googlesource.com/q/topic:%22bower+to+npm+packages+switch%22+(status:open%20OR%20status:merged). |
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| ## Polymer 3 vs Polymer 2 |
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| The biggest difference between 2 and 3 is the changing of package management from bower to npm and also replaced the html imports with es6 imports so we no longer need templates in separate `html` files for polymer components. |
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| ### How that impact plugins |
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| As of now, we still support all syntax in Polymer 2 and most from Polymer 1 with the [legacy layer](https://polymer-library.polymer-project.org/3.0/docs/devguide/legacy-elements). But we do plan to remove those in the future. |
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| So we recommend all plugin owners to start migrating to Polymer 3 for your plugins. You can refer more about polymer 3 from the related resources section. |
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| To get inspirations, check out our [samples here](https://gerrit.googlesource.com/gerrit/+/master/polygerrit-ui/app/samples). |
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| ### Related resources |
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| - [Polymer 3.0 upgrade guide](https://polymer-library.polymer-project.org/3.0/docs/upgrade) |
| -[What's new in Polymer 3.0](https://polymer-library.polymer-project.org/3.0/docs/about_30) |
