/**
 * Sanitizes a redirect pathname by decoding it, removing leading slashes, spaces,
 * and null characters, and re-encoding it as a valid URI.
 *
 * This ensures that the pathname is safe to use in redirects or navigation.
 *
 * @param pathname - The pathname to sanitize (e.g., "/%20/%00home").
 * @returns A sanitized, encoded pathname starting with a single slash.
 *
 * @example
 * sanitizeRedirectPathname("/%20/%00home");
 * // "/home"
 *
 * sanitizeRedirectPathname("///\u0000/about");
 * // "/about"
 */
export declare function sanitizeRedirectPathname(pathname: string): string;
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