Jan Miksovsky is an designer/developer expert at component.kitchen on Web Components. Only interested in coding approaches that can be shared with other people. With emphasis on styling and reuse - twitter 
Many web developers come to reuse through design. We look at his work for clarity on how to decompose to implement ES6 'strict mode' - component.kitchen
Component.kitchen rewrote its backend server to rip out a popular templating language and replaced it with plain JavaScript functions. After language improvements in ES2015 - plus.google.co
On implementing web component mixins as functions component.kitchen
- "ES6 template strings let us easily embed HTML directly inside of JavaScript files, instead of putting JavaScript code inside of HTML files as we did with HTML Imports."
- "Both packaging formats can work, but given the need for JavaScript modules anyway, it seems worthwhile for us to see what we can build with modules alone.
- Stencil.js was introduced recently at the 2017 Polymer Summit - component.kitchen
- Service Workers have indeterminate lifetimes and I think the only way to wake them up is for them to receive a push notification. - component.kitchen
Since the term "framework" can provoke strong negative reactions, authors of such code may actually care whether their code is labeled a framework or not - component.kitchen
- Google, for example, seems to take great pains to avoid describing its own Polymer project as a framework. They call it a "library", which sounds perhaps smaller or less threatening.
- Polymer easily meets all of the above framework criteria. For example, Polymer's internal asynchronous task-scheduling infrastructure establishes the flow of control in a Polymer application, determining when to invoke component lifecycle callbacks and property observers.
- Polymer (library) has begun to gain increasing recognition in the market, with special attention paid to its structured design process, allowing for an interoperable "lego block" structure.
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See Elix ES6 Mixins
After a little more inspection, there's still an awful lot of code. Wonder if the reactive part is worth the effort. Might be that what I really want is much simpler. The Power of Web Components. article
Shim for custom elements in browsers that aren't quite there yet https://github.com/webcomponents/custom-elements Found this article helpful... leaving it here for now. https://blog.sessionstack.com/how-javascript-works-under-the-hood-of-custom-elements-best-practices-on-building-reusable-e118e888de0c
Hybrid.js also eschews class-based inheritance when creating ES6 components. https://hybrids.js.org/ On closer look at the source, this is still not what I'm looking for.
The source code for polymer's `lit-element` looks interesting. github
Also interested in the example of `lit-element` hosted at glitch: glitch