/**
 * Base Chart of chartjs-web-components
 */
export default class BaseChart extends LitElement {
    static get styles(): import("lit-element").CSSResult;
    constructor(...args: any[]);
    /**
     * Manually update chart
     */
    updateChart: () => void;
    /**
     * Called when the dom first time updated. init chart.js data, add observe, and add resize listener
     */
    firstUpdated(): void;
    chart: any;
    /**
     * Use Proxy to watch object props change
     * @params obj
     */
    observe(obj: any): any;
    /**
     * Use lit-html render Elements
     */
    render(): import("lit-element").TemplateResult;
}
import { LitElement } from "lit-element";