An options object for main area widget subclasses providing their own default content.
This makes it easier to have a subclass that provides its own default content. This can go away once we upgrade to TypeScript 2.8 and have an easy way to make a single property optional, ala https://stackoverflow.com/a/46941824
The child widget to wrap.
The optional node to use for the widget.
If a node is provided, the widget will assume full ownership and control of the node, as if it had created the node itself.
The default is a new
An optional promise for when the content is ready to be revealed.
The toolbar to use for the widget. Defaults to an empty toolbar.
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