How to use the unchained-bitcoin.MULTISIG_ADDRESS_TYPES.P2SH function in unchained-bitcoin

function ledgerInput(ledgerbtc, input) {
  const addressType = multisigAddressType(input.multisig);
  const tx = ledgerbtc.splitTransaction(input.transactionHex, true)
  if (addressType == MULTISIG_ADDRESS_TYPES.P2SH) {
    return [tx, input.index, scriptToHex(multisigRedeemScript(input.multisig))];
  } else {
    return [tx, input.index, scriptToHex(multisigWitnessScript(input.multisig))];
  }

}

inputsAreSupported() {
    if (this.inputs && this.inputs.length) {
      for (let i=0; i < this.inputs.length; i++) {
        const input = this.inputs[i];
        const inputAddressType = multisigAddressType(input.multisig);

        if (inputAddressType !== MULTISIG_ADDRESS_TYPES.P2SH) {
          this.inputAddressType = inputAddressType
          return false;
        }
      }
    }
    return true
  }

}

/**
 * Retrieve Trezor format for network constant
 * @param {string} network - bitcoin network
 * @private
 * @returns {string} Trezor format of bitcoin network
 */
function coin(network) {
  return (network === NETWORKS.MAINNET ? "Bitcoin" : "Testnet");
}

const addressScriptTypes = {
  [MULTISIG_ADDRESS_TYPES.P2WSH]: 'SPENDWITNESS',
  [MULTISIG_ADDRESS_TYPES.P2SH]: 'SPENDMULTISIG',
  [MULTISIG_ADDRESS_TYPES.P2SH_P2WSH]: 'SPENDP2SHWITNESS',
}
function trezorInput(input, bip32Path) {
  const requiredSigners = multisigRequiredSigners(input.multisig);
  const addressType = multisigAddressType(input.multisig)
  const spendType = addressScriptTypes[addressType]
  return {
    script_type: spendType,
    multisig: {
      m: requiredSigners,
      pubkeys: multisigPublicKeys(input.multisig).map((publicKey) => trezorPublicKey(publicKey)),
      signatures: Array(requiredSigners).fill(''),
    },
    prev_hash: input.txid,
    prev_index: input.index,
    address_n: bip32PathToSequence(bip32Path),