export declare abstract class ChartBase {
    ctx: import("@suntech-innovation/option").Option<CanvasRenderingContext2D>;
    canvasElem: import("@suntech-innovation/option").Option<HTMLCanvasElement>;
    get sizes(): {
        width: number;
        height: number;
    };
    abstract get nativeElement(): HTMLElement;
    protected clearHolst({ width, height }?: {
        width: number;
        height: number;
    }): void;
    abstract render(args?: any): void;
}