/**
 * Opens a popup centered on the current window.
 * Note that modern browsers may prevent popups from opening automatically,
 * so try to handle the case where the window returned is null.
 *
 * @returns Window | null - The Window object that was opened. If null is returned, the popup failed to open.
 */
export declare const openCenteredPopup: ({ url, width, height, }: {
    url: string;
    width?: number;
    height?: number;
}) => Window | null;
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