/**
 * Theme bridge for eddie-charts.
 *
 * Chart.js needs concrete color strings for series, axes, and tooltips, but
 * Eddie themes via CSS custom properties that resolve against the document
 * theme class. This module reads computed CSS values at runtime and returns
 * strings Chart.js can consume.
 *
 * Primary read: the tier-2 `--ed-theme-color-{background,border,content}-viz-*`
 * token family. Fallback chain to the base `--ed-theme-color-*` tokens is
 * retained so charts keep rendering against older versions of
 * `@brad-frost-web/eddie-design-tokens` that pre-date the viz block.
 */
export interface ChartTheme {
    palette: string[];
    axisColor: string;
    gridlineColor: string;
    tickColor: string;
    labelColor: string;
    tooltipBg: string;
    tooltipFg: string;
    tooltipBorder: string;
    positive: string;
    negative: string;
    neutral: string;
}
export declare function readChartTheme(el: HTMLElement): ChartTheme;
/**
 * Watch for theme swaps on the document root and invoke `cb` with a freshly
 * resolved theme. Also fires once synchronously on subscribe.
 *
 * Returns a cleanup function that disconnects the observer.
 */
export declare function observeThemeChange(el: HTMLElement, cb: (theme: ChartTheme) => void): () => void;
export declare function prefersReducedMotion(): boolean;
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