fix: memoize on-chain results (#3493)

* fix: memo-ize onchain results

* fix: typeof omission

src/hooks/useCurrentBlockTimestamp.ts

 import { BigNumber } from '@ethersproject/bignumber'
 import { useSingleCallResult } from 'lib/hooks/multicall'
-import { useEffect, useState } from 'react'
+import { useMemo } from 'react'
 
 import { useInterfaceMulticall } from './useContract'
 
 // gets the current timestamp from the blockchain
 export default function useCurrentBlockTimestamp(): BigNumber | undefined {
-  const [lastBlock, setLastBlock] = useState<BigNumber | undefined>()
   const multicall = useInterfaceMulticall()
-  const block: BigNumber | undefined = useSingleCallResult(multicall, 'getCurrentBlockTimestamp')?.result?.[0]
-  useEffect(() => {
-    // If block xor lastBlock are undefined, or if block has progressed, then update lastBlock.
-    // This prevents updates when the block doesn't change, because the returned BigNumber will still be referentially unique.
-    if (Boolean(block) !== Boolean(lastBlock) || (block && lastBlock && !block.eq(lastBlock))) {
-      setLastBlock(block)
-    }
-  }, [block, lastBlock])
-  return lastBlock
+  const resultStr: string | undefined = useSingleCallResult(
+    multicall,
+    'getCurrentBlockTimestamp'
+  )?.result?.[0]?.toString()
+  return useMemo(() => (typeof resultStr === 'string' ? BigNumber.from(resultStr) : undefined), [resultStr])
 }

src/hooks/useGasPrice.ts

 import JSBI from 'jsbi'
 import { useSingleCallResult } from 'lib/hooks/multicall'
+import { useMemo } from 'react'
 
 import { useContract } from './useContract'
 import useENSAddress from './useENSAddress'
@@ -22,5 +23,5 @@ export default function useGasPrice(): JSBI | undefined {
   const contract = useContract(address ?? undefined, CHAIN_DATA_ABI, false)
 
   const resultStr = useSingleCallResult(contract, 'latestAnswer').result?.[0]?.toString()
-  return typeof resultStr === 'string' ? JSBI.BigInt(resultStr) : undefined
+  return useMemo(() => (typeof resultStr === 'string' ? JSBI.BigInt(resultStr) : undefined), [resultStr])
 }

src/hooks/useIsArgentWallet.ts

@@ -9,5 +9,5 @@ export default function useIsArgentWallet(): boolean {
   const argentWalletDetector = useArgentWalletDetectorContract()
   const inputs = useMemo(() => [account ?? undefined], [account])
   const call = useSingleCallResult(argentWalletDetector, 'isArgentWallet', inputs, NEVER_RELOAD)
-  return call?.result?.[0] ?? false
+  return Boolean(call?.result?.[0])
 }

src/hooks/useTotalSupply.ts

-import { BigNumber } from '@ethersproject/bignumber'
 import { Currency, CurrencyAmount, Token } from '@uniswap/sdk-core'
 import { useSingleCallResult } from 'lib/hooks/multicall'
+import { useMemo } from 'react'
 
 import { useTokenContract } from './useContract'
 
@@ -9,7 +9,10 @@ import { useTokenContract } from './useContract'
 export function useTotalSupply(token?: Currency): CurrencyAmount<Token> | undefined {
   const contract = useTokenContract(token?.isToken ? token.address : undefined, false)
 
-  const totalSupply: BigNumber = useSingleCallResult(contract, 'totalSupply')?.result?.[0]
+  const totalSupplyStr: string | undefined = useSingleCallResult(contract, 'totalSupply')?.result?.[0]?.toString()
 
-  return token?.isToken && totalSupply ? CurrencyAmount.fromRawAmount(token, totalSupply.toString()) : undefined
+  return useMemo(
+    () => (token?.isToken && totalSupplyStr ? CurrencyAmount.fromRawAmount(token, totalSupplyStr) : undefined),
+    [token, totalSupplyStr]
+  )
 }