TypeError: ethers.getContract is not a function | I tried all the solutions in the internet but no luck :(

[pallab-nandi]

Lesson 7: Timestamp 11:18:10

My Unit Test file FundMe.test.js for FundMe Contract:

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

describe("FundMe", function () {

  let fundMe;
  let deployer;
  let mockV3Aggregator;
  beforeEach(async function () {
    //deploy contract using hardhat
    deployer = (await getNamedAccounts()).deployer;
    await deployments.fixture("all");
    fundMe = await ethers.getContract("FundMe", deployer);
    mockV3Aggregator = await ethers.getContract("MockV3Aggregator", deployer);
  })

  describe("constructor", function () {
    it("sets the aggregator address correctly", async function () {
      const response = await fundMe.priceFeed();
      assert.equal(response, mockV3Aggregator.address);
    })
  })
})

Command I ran into terminal:

yarn hardhat test

Error I got each time:

yarn run v1.22.19
$ /home/pallab/Documents/development/web3/freecodecamp/hardhat-fcc/hardhat-fundme/node_modules/.bin/hardhat test

  FundMe
    constructor

      1) "before each" hook for "sets the aggregator address correctly"


  0 passing (2s)
  1 failing

  1) FundMe
       "before each" hook for "sets the aggregator address correctly":
     TypeError: ethers.getContract is not a function
      at Context.<anonymous> (test/unit/FundMe.test.js:13:27)
      at processTicksAndRejections (node:internal/process/task_queues:95:5)
      at runNextTicks (node:internal/process/task_queues:64:3)
      at listOnTimeout (node:internal/timers:538:9)
      at processTimers (node:internal/timers:512:7)



error Command failed with exit code 1.

My hardhat config file hardhat.config.js :

require("@nomicfoundation/hardhat-toolbox");
require("@nomicfoundation/hardhat-verify");
require('hardhat-gas-reporter');
require("hardhat-deploy");

require('dotenv').config();

const SEPOLIA_RPC_URL = process.env.SEPOLIA_RPC_URL;
const SEPOLIA_PRIVATE_KEY = process.env.SEPOLIA_PRIVATE_KEY;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY;

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  // solidity: "0.8.18",
  solidity: {
    compilers: [
      { version: "0.8.8" },
      { version: "0.6.6" }
    ]
  },
  defaultNetwork: "hardhat",
  networks: {
    localhost: {
      url: "http://127.0.0.1:8545",
      chainId: 31337
    },
    sepolia: {
      url: SEPOLIA_RPC_URL,
      accounts: [SEPOLIA_PRIVATE_KEY],
      chainId: 11155111,
      blockConfirmations: 5
    }
  },
  namedAccounts: {
    deployer: {
      default: 0
    }
  },
  etherscan: {
    apiKey: ETHERSCAN_API_KEY
  },
  gasReporter: {
    enabled: true,
    outputFile: "./gas-report.txt",
    noColors: true,
    currency: "USD",
    coinmarketcap: COINMARKETCAP_API_KEY
  }
};

I am also attaching my github repo of the same project: https://github.com/pallab-nandi/hh-fundme-fcc

[pallab-nandi]

Well After a long long research on the error I finally came to an answer. And this will works with for everyone of those who are using new version of hardhat and ethersJs.
basically on hardhat.config.js file do this thing require at the above. So every code will work just fine:

require("@nomicfoundation/hardhat-toolbox");
require("@nomicfoundation/hardhat-verify");
require('hardhat-gas-reporter');
require("hardhat-deploy");
require('@nomicfoundation/hardhat-ethers');
require('hardhat-deploy-ethers');

/*
your other configurations
*/

[shikhar229169]

Woah, Thanks for this. You can't believe what just happened.
So till yesterday I was using the below package.json and hardhat.config and they working fine, so what I was doing was just pasting these package.json and running yarn install and they were literally working till yesterday, and today when I made a new folder and again installed that it generates certain errors like your dependency need another dependency to be installed. But finally your issue saved me.

require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-deploy");
require("solidity-coverage");
require("hardhat-gas-reporter");
require("hardhat-contract-sizer");
require("dotenv").config();

{
  "devDependencies": {
    "@chainlink/contracts": "^0.6.1",
    "@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers",
    "@nomiclabs/hardhat-etherscan": "^3.1.6",
    "@nomiclabs/hardhat-waffle": "^2.0.5",
    "chai": "^4.3.7",
    "dotenv": "^16.0.3",
    "ethereum-waffle": "^4.0.9",
    "ethers": "5.7.2",
    "hardhat": "^2.12.7",
    "hardhat-contract-sizer": "^2.8.0",
    "hardhat-deploy": "^0.11.23",
    "hardhat-gas-reporter": "^1.0.9",
    "prettier": "^2.8.4",
    "prettier-plugin-solidity": "^1.1.2",
    "solhint": "^3.3.8",
    "solidity-coverage": "^0.8.2"
  },
  "dependencies": {
    "global": "^4.4.0",
    "hardhat-shorthand": "^1.0.0"
  }
}

[pallab-nandi]

cool 💯

[satishnvrn]

I would also like to mention that getContract doesn't exist anymore in ethers v6. If your solution made getContract work, then you are using deprecated API. We have to use getContractAt. I have a solution without even installing hardhat-deploy-ethers. All my code is here: https://github.com/satishnvrn/hardhat-fund-me-sat/blob/main/test/unit/FundMe.test.ts
Feel free to check out my config file as well.

[SWank74]

Use get getContractAt instead of getContract as below:

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

describe ("FundMe",async function () {
    let fundMe, deployer, mockV3AggregatorAddress;
    
    beforeEach(async function () {
        deployer = (await getNamedAccounts()).deployer;
        await deployments.fixture(["all"]); //deploy contracts
        
        //Get the deployment corresponding to FundMe and then get 
        //the address at which the contract is deployed
        const fundMeAtAddress = (await deployments.get("FundMe")).address;

        //Get the contract
        fundMe = await ethers.getContractAt("FundMe",fundMeAtAddress);
    });
    describe("constructor", async function () {
       //test for constructor
        it ( "sets the aggregator address correctly",async function() {
            //Call a function from contract to get the pricefeed
            //Note: priceFeed is a private storage in the contract and 
            //a get function is created to return it to the caller
            const response = await fundMe.getPriceFeed();
            
            mockV3AggregatorAddress = (await deployments.get("MockV3Aggregator")).address;
            assert.equal(response,mockV3AggregatorAddress);
           
        });
    });
});

The detailed documentation on hardhat-deploy below helped
https://www.npmjs.com/package/hardhat-deploy#what-is-it-for-

[ugur17]

Then where do we need deployer while getting the contract?

[maheepatel]

One more solution that worked for me was
installed these packages
yarn add --dev hardhat @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers
and adding require("@nomicfoundation/hardhat-toolbox") in your hardhat.config.js