Class MessagesSidebar<CustomAttrs>

The Component class defines a user interface 'building block'. A component generates a virtual DOM to be rendered on each redraw.

Essentially, this is a wrapper for Mithril's components that adds several useful features:

• In the oninit and onbeforeupdate lifecycle hooks, we store vnode attrs in `this.attrs. This allows us to use attrs across components without having to pass the vnode to every single method.
• The static initAttrs method allows a convenient way to provide defaults (or to otherwise modify) the attrs that have been passed into a component.
• When the component is created in the DOM, we store its DOM element under this.element; this lets us use jQuery to modify child DOM state from internal methods via the this.$() method.
• A convenience component method, which serves as an alternative to hyperscript and JSX.

As with other Mithril components, components extending Component can be initialized and nested using JSX, hyperscript, or a combination of both. The component method can also be used.