utils#approve TypeScript Examples

The following examples show how to use utils#approve. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: useApproval.ts    From index-ui with MIT License 5 votes vote down vote up 
useApproval = (
  tokenAddress?: string,
  spenderAddress?: string,
  onTxHash?: (txHash: string) => void
) => {
  const allowance = useAllowance(tokenAddress, spenderAddress)
  const [isApproving, setIsApproving] = useState(false)
  const [isApproved, setIsApproved] = useState(false)

  const {
    account,
    ethereum,
  }: { account: string | null | undefined; ethereum?: provider } = useWallet()

  const handleApprove = useCallback(async () => {
    if (!ethereum || !account || !spenderAddress || !tokenAddress) {
      return
    }
    try {
      setIsApproving(true)
      const result = await approve(
        account,
        spenderAddress,
        tokenAddress,
        ethereum,
        onTxHash
      )
      setIsApproved(result)
      setIsApproving(false)
    } catch (e) {
      setIsApproving(false)
      return false
    }
  }, [
    account,
    ethereum,
    onTxHash,
    setIsApproved,
    setIsApproving,
    spenderAddress,
    tokenAddress,
  ])

  useEffect(() => {
    if (allowance?.isGreaterThan(minimumRequiredApprovalQuantity)) {
      setIsApproved(true)
      return
    }

    setIsApproved(false)
  }, [allowance, setIsApproved])

  return {
    isApproved,
    isApproving,
    onApprove: handleApprove,
  }
}