How to use the @polkadot/util-crypto.keccakAsU8a function in @polkadot/util-crypto

instrument('keccak_256', (): void => {
        const data = heap.get(dataPtr, dataLen);
        const hash = keccakAsU8a(data);

        l.debug((): any[] => ['keccak_256', [dataPtr, dataLen, outPtr], '<-', u8aToHex(data), '->', u8aToHex(hash)]);

        heap.set(outPtr, hash);
      }),
    // eslint-disable-next-line @typescript-eslint/camelcase

function hash (x) {
  return Buffer.from(keccakAsU8a(x))
}

export function hash(value: bytes): bytes32 {
  return Buffer.from(keccakAsU8a(value));
}

export function hashMessage (message: string): Buffer {
  const expanded = stringToU8a(`\x19Ethereum Signed Message:\n${message.length.toString()}${message}`);
  const hashed = keccakAsU8a(expanded);

  return u8aToBuffer(hashed);
}