export interface ChartFinding {
    kind: 'non-finite-coordinates' | 'empty-geometry' | 'degenerate-geometry';
    tag: string;
    attr: string;
    sample: string;
}
export interface ChartReport {
    examined: number;
    findings: ChartFinding[];
    canvas: boolean;
}
export declare function geometryNumbers(value: string): number[];
export declare function hasNonFiniteCoordinate(value: string): boolean;
export declare function isDegenerate(value: string): boolean;
export declare function inspectChart(root: Element): ChartReport;
export interface CanvasChartData {
    library: 'chartjs' | 'echarts';
    data: unknown;
}
export declare function canvasChartData(canvas: Element, globals: {
    Chart?: {
        getChart?: (el: Element) => {
            data?: unknown;
        } | undefined;
    };
    echarts?: {
        getInstanceByDom?: (el: Element) => {
            getOption?: () => unknown;
        } | undefined;
    };
}): CanvasChartData | null;