import type { Hex } from '@metamask/utils';
import BN from 'bn.js';
import type { FeeMarketEIP1559Values, GasPriceValue, TransactionError, TransactionMeta, TransactionParams } from '../types.js';
export declare const ESTIMATE_GAS_ERROR = "eth_estimateGas rpc method error";
/**
 * Normalizes properties on transaction params.
 *
 * @param txParams - The transaction params to normalize.
 * @returns Normalized transaction params.
 */
export declare function normalizeTransactionParams(txParams: TransactionParams): TransactionParams;
/**
 * Checks if a transaction is EIP-1559 by checking for the existence of
 * maxFeePerGas and maxPriorityFeePerGas within its parameters.
 *
 * @param txParams - Transaction params object to add.
 * @returns Boolean that is true if the transaction is EIP-1559 (has maxFeePerGas and maxPriorityFeePerGas), otherwise returns false.
 */
export declare function isEIP1559Transaction(txParams: TransactionParams): boolean;
export declare const validateGasValues: (gasValues: GasPriceValue | FeeMarketEIP1559Values) => void;
/**
 * Validates that a transaction is unapproved.
 * Throws if the transaction is not unapproved.
 *
 * @param transactionMeta - The transaction metadata to check.
 * @param fnName - The name of the function calling this helper.
 */
export declare function validateIfTransactionUnapproved(transactionMeta: TransactionMeta | undefined, fnName: string): void;
/**
 * Validates that a transaction is unapproved or submitted.
 * Throws if the transaction is not unapproved or submitted.
 *
 * @param transactionMeta - The transaction metadata to check.
 * @param fnName - The name of the function calling this helper.
 */
export declare function validateIfTransactionUnapprovedOrSubmitted(transactionMeta: TransactionMeta | undefined, fnName: string): void;
/**
 * Normalizes properties on transaction params.
 *
 * @param error - The error to be normalize.
 * @returns Normalized transaction error.
 */
export declare function normalizeTxError(error: Error & {
    code?: string;
    value?: unknown;
}): TransactionError;
/**
 * Normalize an object containing gas fee values.
 *
 * @param gasFeeValues - An object containing gas fee values.
 * @returns An object containing normalized gas fee values.
 */
export declare function normalizeGasFeeValues(gasFeeValues: GasPriceValue | FeeMarketEIP1559Values): GasPriceValue | FeeMarketEIP1559Values;
/**
 * Ensure a hex string is of even length by adding a leading 0 if necessary.
 * Any existing `0x` prefix is preserved but is not added if missing.
 *
 * @param hexValue - The hex string to ensure is even.
 * @returns The hex string with an even length.
 */
export declare function padHexToEvenLength(hexValue: string): string;
/**
 * Create a BN from a hex string, accepting an optional 0x prefix.
 *
 * @param hexValue - Hex string with or without 0x prefix.
 * @returns BN parsed as base-16.
 */
export declare function bnFromHex(hexValue: string | Hex): BN;
/**
 * Convert various numeric-like values to a BN instance.
 * Accepts BN, ethers BigNumber, hex string, bigint, or number.
 *
 * @param value - The value to convert.
 * @returns BN representation of the input value.
 */
export declare function toBN(value: unknown): BN;
/**
 * Calculate the absolute percentage change between two values.
 *
 * @param originalValue - The first value.
 * @param newValue - The second value.
 * @returns The percentage change from the first value to the second value.
 * If the original value is zero and the new value is not, returns 100.
 */
export declare function getPercentageChange(originalValue: BN, newValue: BN): number;
/**
 * Sets the envelope type for the given transaction parameters based on the
 * current network's EIP-1559 compatibility and the transaction parameters.
 *
 * @param txParams - The transaction parameters to set the envelope type for.
 * @param isEIP1559Compatible - Indicates if the current network supports EIP-1559.
 */
export declare function setEnvelopeType(txParams: TransactionParams, isEIP1559Compatible: boolean): void;
/**
 * Convert CAIP-2 chain ID to hex format.
 *
 * @param caip2ChainId - Chain ID in CAIP-2 format (e.g., 'eip155:1')
 * @returns Hex chain ID (e.g., '0x1') or undefined if invalid format
 */
export declare function caip2ToHex(caip2ChainId: string): Hex | undefined;
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