type PhotonOpts = {
    width?: number;
    height?: number;
    hostname?: string;
    host?: string;
    secure?: boolean;
    zoom?: number;
    resize?: string;
    fit?: string;
    letterboxing?: string;
    removeLetterBoxing?: boolean;
};
/**
 * Returns a "photon" URL from the given image URL.
 *
 * Defaults to returning an `https:` secure URL from Photon.
 * Pass `secure: false` to get `http:`.
 *
 * Photon documentation: http://developer.wordpress.com/docs/photon/
 * @param imageUrl - the URL of the image to run through Photon
 * @param [opts]   - optional options object with Photon options
 * @returns The generated Photon URL string
 */
export default function photon(imageUrl: string, opts?: PhotonOpts): string | null;
export {};
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