import { type Address } from "@morpho-org/blue-sdk";
import type { PermitRequirementSignature, Requirement } from "../../../types/index.js";
/** Parameters for {@link encodeErc20Permit2Approve}. */
interface EncodeErc20Permit2ApproveParams {
    token: Address;
    amount: bigint;
    chainId: number;
    nonce: bigint;
    expiration?: bigint;
}
/**
 * Builds a Permit2 `Requirement` that, once signed, lets GeneralAdapter1 pull `amount` of `token`
 * via the Permit2 contract.
 *
 * Deadline defaults to two hours from `Time.timestamp()`.
 *
 * @param params - Permit2 encoding parameters.
 * @param params.token - ERC-20 token address.
 * @param params.amount - Permit2 allowance amount (per-call).
 * @param params.chainId - Target chain id.
 * @param params.nonce - The user's current Permit2 nonce for `(token, GeneralAdapter1)`.
 * @param params.expiration - Permit2-managed allowance expiration timestamp.
 * @returns A `Requirement` whose `sign(client, userAddress)` produces the deep-frozen signature.
 * @throws {MissingClientPropertyError} from `sign()` when the client has no `account.address`.
 * @throws {AddressMismatchError} from `sign()` when the client account differs from `userAddress`.
 * @throws {InvalidSignatureError} from `sign()` when EIP-712 verification fails.
 * @example
 * ```ts
 * import { encodeErc20Permit2Approve } from "@morpho-org/morpho-sdk";
 *
 * const requirement = encodeErc20Permit2Approve({
 *   token: USDC,
 *   amount: 1_000_000n,
 *   chainId: 1,
 *   nonce: 0n,
 *   expiration: 281_474_976_710_655n, // MAX_UINT_48 (2^48 - 1, effectively indefinite)
 * });
 * // requirement satisfies Requirement
 * ```
 */
export declare const encodeErc20Permit2Approve: (params: EncodeErc20Permit2ApproveParams) => Requirement<PermitRequirementSignature>;
export {};