How to use the @dashevo/dashcore-lib.Address.isValid function in @dashevo/dashcore-lib

body: JSON.stringify({ rawtx: tx.toString() }),
      });
      const { txid } = await raw.json();
      resolve(txid);
    } catch (err) {
      reject(`Could not broadcast tx: ${err}`);
    }
  });

export const NAME = 'Dashcoin';

export const SYMBOL = 'dash';

export const URL_TX = URL + '/insight/tx/'

export const validateAddress = Address.isValid;

export const fetchFee = async ({ to, from, privateKey, amount }) => {
  const fromAddress = Address.fromString(from);
  const toAddress = Address.fromString(to);
  const utxos = await getUnspentUtxos(fromAddress);
  const tx = generateTx({
    utxos,
    fromAddress,
    toAddress,
    privateKey,
    amount,
  });
  const { inputs, outputs } = tx.toObject();
  const totalInputs = inputs.reduce((p, c) => p + c.output.satoshis, 0);
  const totalOutputs = outputs.reduce((p, c) => p + c.satoshis, 0);
  const fee = totalInputs - totalOutputs;