Lesson 7: Error when running script fund.js - fund is not a function

[avaradkar22]

I am running the following fund.js script:

const { ethers, deployments } = require("hardhat");

async function main() {

const fundMe = await deployments.get("FundMe");
console.log(`Got contract FundMe at ${fundMe.address}`);
console.log("Funding contract...");
const transactionResponse = await fundMe.fund({
    value: ethers.utils.parseEther("2"),
});
await transactionResponse.wait(1);
console.log("Funded!");

}

main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});

The contract is deployed to the localhost, however am getting the following error:

Got contract FundMe at 0x71C95911E9a5D330f4D621842EC243EE1343292e
Funding contract...
TypeError: fundMe.fund is not a function
at main (/home/hh-fcc/hardhat-fund-me/scripts/fund.js:9:46)
at processTicksAndRejections (node:internal/process/task_queues:96:5)

This is my FundMe.sol:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

import "./PriceConverter.sol";

error NotOwner();

contract FundMe {
address public immutable i_owner;

AggregatorV3Interface public priceFeed;

constructor(address priceFeedAddress) {
    i_owner = msg.sender;
    priceFeed = AggregatorV3Interface(priceFeedAddress);
}

using PriceConverter for uint256;

uint256 public constant MINIMUM_USD = 1;

address[] public funders;
mapping(address => uint256) public addressToAmountFunded;


function fund() public payable {
    require(
        msg.value.getConversionRate(priceFeed) >= MINIMUM_USD,
        "Did not send enough moolah!"
    );
    funders.push(msg.sender);
    addressToAmountFunded[msg.sender] += msg.value;
}

function getPriceFeed() public view returns (AggregatorV3Interface) {
    return priceFeed;
}

function getOwner() public view returns (address) {
    return i_owner;
}

function withdraw() public onlyi_owner {
    for (
        uint256 funderIndex = 0;
        funderIndex < funders.length;
        funderIndex++
    ) {
        address funder = funders[funderIndex];
        addressToAmountFunded[funder] = 0;
    }
    // reset the array
    funders = new address[](0);

    payable(msg.sender).transfer(address(this).balance);
}

modifier onlyi_owner() {
    if (msg.sender != i_owner) {
        revert NotOwner();
    }
    _;
}

receive() external payable {
    fund();
}

fallback() external payable {
    fund();
}

}

[Naman1729]

Hey @avaradkar22 , use this in fund.js

const fundMe = await ethers.getContract("FundMe", deployer);

and don't forget to use ethers version 5.7.2

[avaradkar22]

Hi @Naman1729

I changed my version of ethers and using ethers.getContract, however now I am getting the following error:

TypeError: Cannot read properties of undefined (reading 'networks')

Thanks for your help

[Naman1729]

Hey @avaradkar22 , Can you push your code to github that will helpful for debugging it

Don't forget to share you repo here.

[pallab-nandi]

Hi @avaradkar22 ! Since newer version of hardhat and ethersJs changes few syntax, a little change in your fund.js script will do the job. Mine works the similar way.
So here is the solution:

on fundMe part, you did:

const fundMe = await deployments.get("FundMe");

change this line with:

{ deployer } = await getNamedAccounts();
const fundMe = await getContract("FundMe", deployer);

And on the top of the line import:

const { getNamedAccounts, ethers } = require("hardhat");

on transactionResponse part, you did:

const transactionResponse = await fundMe.fund({
    value: ethers.utils.parseEther("2"),
});

Change this line with:

const transactionResponse = await fundMe.fund({
    value: ethers.parseEther("2"),
});

Observe closely in newer version you have to do ethers.parseEther("2") instead of ethers.utils.parseEther("2"). Now run the script again by using command:

yarn hardhat run scripts/fund.js --network localhost

and it will do the job 👍🏻

Note: remember you do have your fund.js script under scripts folder and you have configured your localhost network in hardhat.config.js file before running the command!

[avaradkar22]

Was finally able to solve it by making the following change in the fund.js script:

const fundMe = await ethers.getContract("FundMe", deployer);
const fundMeAddress = await fundMe.getAddress();
console.log(Got contract FundMe at ${fundMeAddress});

Also upgraded ethers to version 6.6.2

Thank you @Naman1729 and @pallab-nandi for your help