Function hexStringToBytes

packages/hardhat-utils/src/hex.ts:111–123

(hexString: string)

 * @throws InvalidParameterError If the input is not a hexadecimal string.
 */
export function hexStringToBytes(hexString: string): Uint8Array {
  if (!isHexString(hexString)) {
    throw new InvalidParameterError(
      `Expected a valid hexadecimal string. Received: ${hexString}`,
    );
  }

  // Pad the hex string if it's odd, as Buffer.from will truncate it
  // the last character if it's not a full byte.
  // See: https://nodejs.org/api/buffer.html#buffers-and-character-encodings
  const unprefixedHexString = getUnprefixedHexString(padToEven(hexString));
  return Uint8Array.from(Buffer.from(unprefixedHexString, "hex"));
}

/**
 * Normalizes and validates a string that represents a hexadecimal number.