How to use @web3-react/network-connector - 1 common examples

import { FrameConnector } from '@web3-react/frame-connector'
import { AuthereumConnector } from '@web3-react/authereum-connector'
import { FortmaticConnector } from '@web3-react/fortmatic-connector'
import { PortisConnector } from '@web3-react/portis-connector'
import { SquarelinkConnector } from '@web3-react/squarelink-connector'
import { TorusConnector } from '@web3-react/torus-connector'

const POLLING_INTERVAL = 8000
const RPC_URLS: { [chainId: number]: string } = {
  1: process.env.RPC_URL_1 as string,
  4: process.env.RPC_URL_4 as string
}

export const injected = new InjectedConnector({ supportedChainIds: [1, 3, 4, 5, 42] })

export const network = new NetworkConnector({
  urls: { 1: RPC_URLS[1], 4: RPC_URLS[4] },
  defaultChainId: 1,
  pollingInterval: POLLING_INTERVAL
})

export const walletconnect = new WalletConnectConnector({
  rpc: { 1: RPC_URLS[1] },
  bridge: 'https://bridge.walletconnect.org',
  qrcode: true,
  pollingInterval: POLLING_INTERVAL
})

export const walletlink = new WalletLinkConnector({
  url: RPC_URLS[1],
  appName: 'web3-react example'
})