src/vs/workbench/contrib/comments/browser/reactionsAction.ts/ReactionAction/constructor
class ReactionAction:	constructor(id: string, label: string = '', cssClass: string = '', enabled: boolean = true, actionCallback?: (event?: any) => Promise<any>, public icon?: UriComponents, public count?: number) {
		super(ReactionAction.ID, label, cssClass, enabled, actionCallback);
	}