[RRFC] LitElement theming API

[aomarks]

The idea is to have a pragmatic API, inspired by https://github.com/vaadin/vaadin-themable-mixin, that makes it possible for component authors to allow consumers to insert custom styling. Related to but not dependent on ::part support/polyfill.

[web-padawan]

Hi! I'm currently working on prototyping Lit versions of our mixins.

You can find a Lit version here:
https://github.com/vaadin/component-mixins/tree/master/packages/themable-element

Note:

1. dom-module is used for compatibility, so that Lit components can consume styles defined through registerStyle from Polymer

2. We also sort modules by name to ensure that styles with vaadin- prefix and our theme prefixes come first.

Ping me if you have any ideas you'd like to discuss.

[abdonrd]

Package moved to:

https://github.com/vaadin/component-mixins/tree/master/packages/themable-element

[web-padawan]

@abdonrd thanks, updated my comment above to point to the correct version.

[justinfagnani]

This is a large enough feature request that it should become an RFC.

[justinfagnani]

I moved this from a LitElement issue to an RRFC. I think it'd be good to to also propose an interoperable WCCG Community Protocol proposal too.

[gperdomor]

Any update?