Function hexStringToNumber

packages/hardhat-utils/src/hex.ts:66–89

(hexString: string)

 * @throws InvalidParameterError If the input is not a hexadecimal string or the value exceeds the Number.MAX_SAFE_INTEGER limit.
 */
export function hexStringToNumber(hexString: string): number {
  if (!isHexString(hexString)) {
    throw new InvalidParameterError(
      `Expected a valid hexadecimal string. Received: ${hexString}`,
    );
  }

  // Prefix the string as it is required to make parseInt interpret it as a
  // hexadecimal number.
  let prefixedHexString = getPrefixedHexString(hexString);

  // Handle the special case where the string is "0x".
  prefixedHexString = prefixedHexString === "0x" ? "0x0" : prefixedHexString;

  const numberValue = parseInt(prefixedHexString, 16);

  if (numberValue > Number.MAX_SAFE_INTEGER) {
    throw new InvalidParameterError(
      `Value exceeds the safe integer limit. Received: ${hexString}`,
    );
  }

  return numberValue;
}

/**
 * Converts a Uint8Array to a hexadecimal string.