/**
 * Transaction Cancel Module
 *
 * Cancels a pending transaction by replacing it with a 0-value transaction to self
 * using the same nonce and a higher gas price (e.g. 2x when using --transaction-hash).
 * @see https://info.etherscan.com/how-to-cancel-ethereum-pending-transactions/
 */
interface CancelTransactionOptions {
    /** Pending transaction nonce (use with gasPrice, or use transactionHash instead) */
    nonce?: string;
    /** Gas price higher than the pending transaction (use with nonce) */
    gasPrice?: string;
    /** Pending transaction hash; nonce and gas price will be fetched and gas price increased by 100% */
    transactionHash?: string;
}
/** Signer with provider, compatible with ethers v5 and v6. */
interface CancelTransactionSigner {
    getAddress(): Promise<string>;
    provider: {
        getTransaction?(hash: string): Promise<unknown>;
    } | null;
    sendTransaction(tx: Record<string, unknown>): Promise<{
        hash: string;
    }>;
}
/**
 * Cancels a pending transaction by sending a 0-value transaction to self with the same nonce
 * and a higher gas price. Supports both ethers v5 and v6 signers via a unified transaction object.
 * @param {CancelTransactionSigner} signer - Signer with provider (ethers v5 or v6)
 * @param {CancelTransactionOptions} options - Either (nonce + gasPrice) or transactionHash
 * @returns {Promise<string>} The replacement transaction hash
 * @throws If neither (nonce and gasPrice) nor transactionHash is provided
 * @throws If provider is not available on signer
 */
declare const cancelTransaction: (signer: CancelTransactionSigner, options: CancelTransactionOptions) => Promise<string>;

export { type CancelTransactionOptions, type CancelTransactionSigner, cancelTransaction };