/**
 * FIFE URL sizing utilities.
 *
 * Google FIFE (Fast Image Fetch Engine) serves images at a base URL.
 * Appending sizing options (e.g. =w780, =h1200, =w780-h1688) controls
 * the output resolution.
 */
/** Options for controlling FIFE image resolution. */
export interface FifeImageOptions {
    /** Requested image width in pixels. */
    width?: number;
    /** Requested image height in pixels. */
    height?: number;
}
/**
 * Build a FIFE URL sizing suffix from options.
 *
 * @returns A suffix string like "=w780", "=h1200", "=w780-h1688", or "" if no options.
 */
export declare function buildFifeSuffix(options?: FifeImageOptions): string;
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