src/vs/editor/contrib/hover/hover.ts/ShowDefinitionPreviewHoverAction/constructor
class ShowDefinitionPreviewHoverAction:	constructor() {
		super({
			id: 'editor.action.showDefinitionPreviewHover',
			label: nls.localize({
				key: 'showDefinitionPreviewHover',
				comment: [
					'Label for action that will trigger the showing of definition preview hover in the editor.',
					'This allows for users to show the definition preview hover without using the mouse.'
				]
			}, "Show Definition Preview Hover"),
			alias: 'Show Definition Preview Hover',
			precondition: undefined
		});
	}