export interface DarkModeScreenshot {
    readonly base64: string;
    readonly mimeType: "image/png";
}
export interface DarkModeResult {
    readonly hasDarkMode: boolean;
    readonly differencePercent: number;
    readonly lightScreenshot: DarkModeScreenshot;
    readonly darkScreenshot: DarkModeScreenshot;
    readonly url: string;
    readonly timestamp: string;
}
/**
 * Detect whether a web page supports dark mode.
 *
 * Captures the page twice — once in light mode (default) and once
 * with `prefers-color-scheme: dark` emulated — then compares the
 * resulting screenshots via base64 string comparison.
 *
 * Returns both screenshots, a boolean indicating dark mode support,
 * and the approximate difference percentage.
 */
export declare function checkDarkMode(url: string): Promise<DarkModeResult>;
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