import * as anchor from "@project-serum/anchor";
/**
 * Close the OptionState account and release lamports
 * @param provider Anchor provider
 * @param assetNftMint Asset NFT which underlies the option
 * @returns Promise resolving to the transaction signature
 */
export declare const closeOptionState: (provider: anchor.AnchorProvider, assetNftMint: anchor.web3.PublicKey) => Promise<string>;