/**
 * Gets the wallet book CDN URL from environment variables with fallback to default.
 *
 * Checks for environment variables in the following order:
 * 1. WALLET_BOOK_CDN_URL
 * 2. NEXT_PUBLIC_WALLET_BOOK_CDN_URL
 * 4. Default CDN URL
 *
 * @returns The wallet book CDN URL to use.
  * @notInstrumented
 */
export declare const getWalletBookCdnUrl: () => string;
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