import type { UseSignTypedDataReturn } from '@meshconnect/uwc-types';
/**
 * Hook for signing EIP-712 typed structured data (eth_signTypedData_v4).
 *
 * Used by ERC-3009 (Transfer With Authorization) and EIP-2612 (Permit) relay
 * flows — the user signs an off-chain authorization and Mesh's backend submits
 * the transaction and pays gas. EVM-only (eip155); throws for TON connections.
 *
 * @returns Object containing signTypedData function, loading state, last signature, and error
 * @throws Error if used outside of ConnectionProvider
 * @example
 * ```tsx
 * const { signTypedData, isLoading, signature } = useSignTypedData()
 *
 * const handleSign = async () => {
 *   try {
 *     const sig = await signTypedData(typedData)
 *     // send sig to the relay endpoint
 *   } catch (error) {
 *     console.error('Failed to sign:', error)
 *   }
 * }
 * ```
 */
export declare function useSignTypedData(): UseSignTypedDataReturn;
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