Declarative event discovery on custom elements

[bergie]

For libraries and UIs wrapping Polymer, it would be extremely handly for custom elements to be able to provide a listing of their events and attributes in a declarative fashion.

Something like:

<polymer-element name="foo" attributes="bar baz" events="moved">
...
</polymer-element>

The events and attributes lists could be available either through window.CustomElements or some Polymer API.

[bergie]

Here is the use case I have for this, currently using a separate element for providing the introspection capability:

https://github.com/noflo/noflo-polymer#noflo-polymer-

[sjmiles]

Our policy so far has been to be hardcore about not including information in the main declarations that is not strictly necessary at run-time.

When we need additional information, we use metadata constructs just like you did.

Example:
https://github.com/PolymerLabs/polymer-ui-tabs/blob/master/metadata.html