/**
 * Creates a SIWE message for wallet auth. Uses current domain and origin.
 * Safe for SSR: returns undefined when window is not available.
 *
 * @param address - Wallet address to sign
 * @param nonce - Server-provided nonce
 * @param chainId - Chain ID for the message
 *
 * @example
 * ```tsx
 * const message = createSIWEMessage(address, nonce, chainId)
 * const signature = await signMessage({ message })
 * ```
 */
export declare const createSIWEMessage: (address: `0x${string}`, nonce: string, chainId: number) => string | undefined;