src/vs/editor/contrib/indentation/indentation.ts/IndentationToTabsAction/constructor
class IndentationToTabsAction:	constructor() {
		super({
			id: IndentationToTabsAction.ID,
			label: nls.localize('indentationToTabs', "Convert Indentation to Tabs"),
			alias: 'Convert Indentation to Tabs',
			precondition: EditorContextKeys.writable
		});
	}