Add ethers example with events (#572)

examples/ethers-v5/src/index.ts

@@ -3,13 +3,22 @@ import { Dai__factory } from '../types/ethers-contracts/factories/Dai__factory'
 
 const RPC_HOST = 'https://mainnet.infura.io/v3/6d6c70e65c77429482df5b64a4d0c943'
 const DAI_ADDRESS = '0x6B175474E89094C44Da98b954EedeAC495271d0F'
+const BLOCK_NUMBER = 13730326
 
 async function main() {
   const provider = new ethers.providers.JsonRpcProvider(RPC_HOST)
   const dai = Dai__factory.connect(DAI_ADDRESS, provider)
   const balance = await dai.balanceOf('0x70b144972C5Ef6CB941A5379240B74239c418CD4')
 
   console.log(`Our DAI balance is: ${utils.formatEther(balance)}`)
+
+  console.log(`Listing Transfer events for block ${BLOCK_NUMBER}`)
+  const eventsFilter = dai.filters.Transfer()
+  const events = await dai.queryFilter(eventsFilter, BLOCK_NUMBER, BLOCK_NUMBER)
+
+  for (const event of events) {
+    console.log(`${event.args.src} -> ${event.args.dst} | ${utils.formatEther(event.args.wad)} DAI`)
+  }
 }
 
 main().catch((e) => {