import { Item, SignalListenerHandler, View } from 'vega';
export declare function addSignalListenerIfExists(view: View, signal: string, cb: SignalListenerHandler): void;
export declare function setSignalIfExists(view: View, signal: string, value: unknown): void;
export declare function getMarkName(item: Item): string;
export declare function signalLogger(view: View, id?: string): (...signals: string[]) => void;