/**
 * Detects whether a theme is light or dark based on its background color.
 *
 * @param theme - Parsed theme content
 * @returns "light" or "dark" based on the background color luminance
 *
 * @example
 * ```ts
 * const theme = {
 *   colors: {
 *     primary: {
 *       background: "#1e2127",
 *       foreground: "#abb2bf"
 *     }
 *   }
 * };
 * detectThemeBrightness(theme) // "dark"
 * ```
 */
export declare function detectThemeBrightness(theme: Record<string, unknown>): "light" | "dark";
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