How to use the @polkadot/extrinsics.default function in @polkadot/extrinsics

const BN = require('bn.js');
const Rpc = require('@polkadot/rpc-core').default;
const WsProvider = require('@polkadot/rpc-provider/ws').default;
const extrinsics = require('@polkadot/extrinsics').default;
const encodeExtrinsic = require('@polkadot/extrinsics/codec/encode/uncheckedLength').default;
const Keyring = require('@polkadot/keyring').default;
const storage = require('@polkadot/storage').default;

const Encoder = new TextEncoder();
const keyring = new Keyring();
const provider = new WsProvider('ws://127.0.0.1:9944');
const api = new Rpc(provider);

async function getAccountIndex (address) {
  return api.state.getStorage([storage.system.public.accountIndexOf, address]);
}

async function transfer (keyRingFrom, addressTo, amount) {
  const nextAccountIndex = await getAccountIndex(keyRingFrom.address());

const BN = require('bn.js');
const Rpc = require('@polkadot/rpc-core').default;
const WsProvider = require('@polkadot/rpc-provider/ws').default;
const extrinsics = require('@polkadot/extrinsics').default;
const encodeExtrinsic = require('@polkadot/extrinsics/codec/encode').default;
const encodeLength = require('@polkadot/extrinsics/codec/encode/length').default;
const Keyring = require('@polkadot/keyring').default;
const storage = require('@polkadot/storage').default;

const Encoder = new TextEncoder();
const keyring = new Keyring();
const provider = new WsProvider('ws://127.0.0.1:9944');
const api = new Rpc(provider);

async function getAccountIndex (address) {
  return api.state.getStorage([storage.system.public.accountIndexOf, address]);
}

async function transfer (keyRingFrom, addressTo, amount) {
  const accountIndex = await getAccountIndex(keyRingFrom.address());