import type { Address, Client } from "viem";
import { type ERC20ApprovalAction, type Transaction } from "../../../types/index.js";
/** Parameters for {@link getMidnightApprovalRequirements}. */
export interface GetMidnightApprovalRequirementsParams {
    readonly viemClient: Client;
    readonly chainId: number;
    readonly token: Address;
    readonly owner: Address;
    readonly spender: Address;
    readonly amount: bigint;
}
/**
 * Resolves classic ERC20 approval requirements for a Midnight spender.
 *
 * Entity flows call this from `getRequirements()`. Direct low-level consumers
 * should call it before encoding a Midnight action that lets `Midnight` or
 * `MidnightBundles` pull ERC20 tokens from the user.
 *
 * @param params.viemClient - Viem client used to read ERC20 allowance.
 * @param params.chainId - Chain id expected by the viem client.
 * @param params.token - ERC20 token that may need approval.
 * @param params.owner - Token owner.
 * @param params.spender - Midnight spender that will pull tokens.
 * @param params.amount - Token amount the spender must be able to pull.
 * @returns Approval transactions required for `spender` to pull `amount`.
 * @throws {ChainIdMismatchError} when the viem client is connected to another chain.
 * @throws {NegativeInputError} when `amount < 0n`.
 * @throws {UnsupportedErc20ApprovalSpenderError} when `spender` is not the chain's Midnight or MidnightBundles deployment.
 * @example
 * ```ts
 * import {
 *   getMidnightApprovalRequirements,
 *   midnightTakeLend,
 * } from "@morpho-org/morpho-sdk";
 *
 * const approvals = await getMidnightApprovalRequirements({
 *   viemClient: client,
 *   chainId: 8453,
 *   token: loanToken,
 *   owner: user,
 *   spender: midnightBundles,
 *   amount: 1_000_000n,
 * });
 * if (approvals.length === 0) {
 *   const tx = midnightTakeLend(takeParams);
 * }
 * ```
 */
export declare const getMidnightApprovalRequirements: (params: GetMidnightApprovalRequirementsParams) => Promise<readonly Readonly<Transaction<ERC20ApprovalAction>>[]>;