src/vs/editor/browser/editorExtensions.ts/Command/constructor
class Command:	constructor(opts: ICommandOptions) {
		this.id = opts.id;
		this.precondition = opts.precondition;
		this._kbOpts = opts.kbOpts;
		this._menuOpts = opts.menuOpts;
		this._description = opts.description;
	}