import { ChartMessage } from '../types/chart-message.js';
/**
 * Output chart messages, either by using the user provider handler
 * on writing them to the console in development environments
 * @param messages - messages to oupput
 * @param customHandler - additional handler to output messages
 */
export declare function outputMessages(messages: ChartMessage[], customHandler: ((messages: ChartMessage[]) => void) | undefined): void;