src/vs/base/common/actions.ts/Action/constructor
class Action:	constructor(id: string, label: string = '', cssClass: string = '', enabled: boolean = true, actionCallback?: (event?: unknown) => unknown) {
		super();
		this._id = id;
		this._label = label;
		this._cssClass = cssClass;
		this._enabled = enabled;
		this._actionCallback = actionCallback;
	}