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

private seedValidate ({ suri, type }: RequestSeedValidate): ResponseSeedValidate {
    const { phrase } = keyExtractSuri(suri);

    if (isHex(phrase)) {
      assert(isHex(phrase, 256), 'Hex seed needs to be 256-bits');
    } else {
      // sadly isHex detects as string, so we need a cast here
      assert(SEED_LENGTHS.includes((phrase as string).split(' ').length), `Mnemonic needs to contain ${SEED_LENGTHS.join(', ')} words`);
      assert(mnemonicValidate(phrase), 'Not a valid mnemonic seed');
    }

    return {
      address: keyring.createFromUri(suri, {}, type).address,
      suri
    };
  }

public createFromUri (_suri: string, meta: KeyringPair$Meta = {}, type: KeypairType = this.type): KeyringPair {
    // here we only aut-add the dev phrase if we have a hard-derived path
    const suri = _suri.startsWith('//')
      ? `${DEV_PHRASE}${_suri}`
      : _suri;
    const { password, phrase, path } = keyExtractSuri(suri);
    let seed;

    if (isHex(phrase, 256)) {
      seed = hexToU8a(phrase);
    } else {
      const str = phrase as string;
      const parts = str.split(' ');

      if ([12, 15, 18, 21, 24].includes(parts.length)) {
        // FIXME This keeps compat with older versions, but breaks compat with subkey
        // seed = type === 'sr25519'
        //   ? mnemonicToMiniSecret(phrase, password)
        //   : mnemonicToSeed(phrase, password);
        seed = mnemonicToMiniSecret(phrase, password);
      } else {
        assert(str.length <= 32, 'specified phrase is not a valid mnemonic and is invalid as a raw seed at > 32 bytes');

function deriveValidate (seed: string, derivePath: string, pairType: KeypairType): string | null {
  try {
    const { path } = keyExtractSuri(`${seed}${derivePath}`);

    // we don't allow soft for ed25519
    if (pairType === 'ed25519' && path.some(({ isSoft }): boolean => isSoft)) {
      return 'Soft derivation paths are not allowed on ed25519';
    }
  } catch (error) {
    return error.message;
  }

  return null;
}

function deriveValidate (seed: string, derivePath: string, pairType: KeypairType): string | null {
  try {
    const { path } = keyExtractSuri(`${seed}${derivePath}`);

    // we don't allow soft for ed25519
    if (pairType === 'ed25519' && path.some(({ isSoft }): boolean => isSoft)) {
      return 'Soft derivation paths are not allowed on ed25519';
    }
  } catch (error) {
    return error.message;
  }

  return null;
}

useEffect((): void => {
    try {
      const { phrase } = keyExtractSuri(suri);

      assert(mnemonicValidate(phrase), 'Invalid mnemonic phrase');

      setPublicKey(u8aToHex(keyring.createFromUri(suri, {}, crypto).publicKey));
    } catch (error) {
      setPublicKey(EMPTY_KEY);
    }
  }, [crypto, suri]);