Lesson 7: TypeError: Cannot read properties of undefined (reading 'getContract')

[joonsun4u]

Hi I need help here. I`m testing FundMe constructor and having this error:

  FundMe
    constructor
      1) "before each" hook for "sets the aggregator addresses correctly"


  0 passing (956ms)
  1 failing

  1) FundMe
       "before each" hook for "sets the aggregator addresses correctly":
     TypeError: Cannot read properties of undefined (reading 'getContract')
      at Context.<anonymous> (test/unit/FundMe.test.js:17:31)
      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)

code FundMe.test.js looks like this:

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

describe("FundMe", async function () {
    let fundMe
    let mockV3Aggregator
    let deployer
    beforeEach(async function () {
        deployer = (await getNamedAccounts()).deployer
        await deployments.fixture(["all"])
        fundMe = await ethers.getContract("FundMe", deployer)
        mockV3Aggregator = await ethers.getContract(
            "MockV3Aggregator",
            deployer
        )
    })

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

how can I solve this TypeError problem?

[Niferu]

Hi @joonsun4u

Please show me your hardhat.config.js and package.json as I'm almost sure issue lays there.

[joonsun4u]

Here is hardhat.config.js

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

const SEPOLIA_RPC_URL = process.env.SEPOLIA_RPC_URL
const PRIVATE_KEY = process.env.PRIVATE_KEY
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blockConfirmations: 6,
        },
        localhost: {
            url: "http://127.0.0.1:8545/",
            chainID: 31337,
        },
    },
    solidity: {
        compilers: [
            {
                version: "0.8.8",
            },
            {
                version: "0.6.6",
            },
        ],
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
        // customChains: [], // uncomment this line if you are getting a TypeError: customChains is not iterable
    },
    gasReporter: {
        enabled: false,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: COINMARKETCAP_API_KEY,
    },
    namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
        },
    },
    mocha: {
        timeout: 500000,
    },
}

Here is package.json

{
  "devDependencies": {
    "@chainlink/contracts": "^0.6.1",
    "@ethersproject/abi": "^5.4.7",
    "@ethersproject/providers": "^5.4.7",
    "@nomicfoundation/hardhat-chai-matchers": "^1.0.0",
    "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
    "@nomicfoundation/hardhat-toolbox": "^2.0.0",
    "@nomiclabs/hardhat-ethers": "^2.2.3",
    "@nomiclabs/hardhat-etherscan": "^3.0.0",
    "@typechain/ethers-v5": "^10.1.0",
    "@typechain/hardhat": "^6.1.2",
    "chai": "^4.2.0",
    "ethers": "^6.3.0",
    "hardhat": "^2.14.0",
    "hardhat-gas-reporter": "^1.0.8",
    "hardhat-waffle": "^0.0.1-security",
    "solhint": "^3.4.1",
    "solidity-coverage": "^0.8.0",
    "typechain": "^8.1.0"
  },
  "dependencies": {
    "dotenv": "^16.0.3",
    "hardhat-deploy": "^0.11.27"
  }
}

[Niferu]

@joonsun4u

In your hardhat.config.js just uncomment following line

require("@nomiclabs/hardhat-waffle")

This will fix your problem

[joonsun4u]

I uncommented out that and I have a different TypeError

$ /Users/joonsunkim/hh-fcc/hardhat-fund-me-fcc/node_modules/.bin/hardhat test


  FundMe
    constructor
      1) "before each" hook for "sets the aggregator addresses correctly"


  0 passing (2s)
  1 failing

  1) FundMe
       "before each" hook for "sets the aggregator addresses correctly":
     TypeError: Cannot read properties of undefined (reading 'JsonRpcProvider')
      at Object.<anonymous> (node_modules/@nomiclabs/hardhat-ethers/src/internal/ethers-provider-wrapper.ts:4:61)
      at Module._compile (node:internal/modules/cjs/loader:1254:14)
      at Object.Module._extensions..js (node:internal/modules/cjs/loader:1308:10)
      at Module.load (node:internal/modules/cjs/loader:1117:32)
      at Function.Module._load (node:internal/modules/cjs/loader:958:12)
      at Module.require (node:internal/modules/cjs/loader:1141:19)
      at require (node:internal/modules/cjs/helpers:110:18)
      at Object.<anonymous> (node_modules/@nomiclabs/hardhat-ethers/src/internal/provider-proxy.ts:7:1)
      at Module._compile (node:internal/modules/cjs/loader:1254:14)
      at Object.Module._extensions..js (node:internal/modules/cjs/loader:1308:10)



error Command failed with exit code 1.

[Niferu]

@joonsun4u

Just downgrade your ethers from "ethers": "^6.3.0", to "ethers": "^5.5.3", for example.

[HarshDev56]

@joonsun4u run this command and then try

if you are using yarn
yarn add --dev @nomiclabs/hardhat-ethers

if you are using npm
npm install --save-dev @nomiclabs/hardhat-ethers

[joonsun4u]

I tried that but still didn't work.

[alymurtazamemon]

@joonsun4u Is it resolved? If yes then please mark the answer otherwise leave your repository link, and I will look into it.

[joonsun4u]

I fixed it after installing this:
yarn add --dev hardhat @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers