import { ModelObserver } from '../observers/model-observer';
import { Chart, ChartOptions, ChartData, ChartType } from 'chart.js';
export declare class ChartAttribute {
    private element;
    private modelObserver;
    constructor(element: HTMLCanvasElement, modelObserver: ModelObserver);
    activeChart?: Chart;
    private chartData;
    type: ChartType;
    typeChanged(): void;
    data: ChartData;
    dataChanged(): void;
    shouldUpdate: boolean | string;
    private get isObserving();
    throttle?: number;
    nativeOptions: ChartOptions;
    bind(): void;
    attached(): void;
    detached(): void;
    refreshChart: () => void;
    subscribeToChanges(): void;
}