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

[4O4MAGlC1AN]

thomastang@DESKTOP-QVDERAL:~/chainlink/hardhat-fund-me$ yarn hardhat test
yarn run v1.22.19
warning package.json: No license field
$ /home/thomastang/chainlink/hardhat-fund-me/node_modules/.bin/hardhat test
Compiled 8 Solidity files successfully


  FundMe
    constructor
      1) "before each" hook for "Sets the aggregator addresses corrently"


  0 passing (502ms)
  1 failing

  1) FundMe
       "before each" hook for "Sets the aggregator addresses corrently":
     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:1198:14)
      at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
      at Module.load (node:internal/modules/cjs/loader:1076:32)
      at Function.Module._load (node:internal/modules/cjs/loader:911:12)
      at Module.require (node:internal/modules/cjs/loader:1100:19)
      at require (node:internal/modules/cjs/helpers:119:18)
      at Object.<anonymous> (node_modules/@nomiclabs/hardhat-ethers/src/internal/provider-proxy.ts:9:1)
      at Module._compile (node:internal/modules/cjs/loader:1198:14)
      at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)

FundMe.test.js

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

describe("FundMe", async function () {
  let fundMe;
  let deployer;
  let mockV3Aggregator;
  beforeEach(async function () {
    // deploy fundme contract
    // using hardhat-deploy
    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 corrently", async function () {
      const response = await fundMe.priceFeed();
      assert.equal(response, mockV3Aggregator.address);
    });
  });
});

[skarthik05]

Hello, @4O4MAGlC1AN .

You might be using the most recent version, which has undergone significant modifications; please go to the documentation for additional details.

Happy learning!

[FreezingM]

Maybe you can try to downgrade ethers to v5 or try to import JsonRpcProvider to fix it, this is the solution I found, you can try it out! : )
https://ethereum.stackexchange.com/questions/144451/typeerror-cannot-read-properties-of-undefined-reading-jsonrpcprovider
https://stackoverflow.com/questions/75717962/jsonrpcprovider-error-when-deploying-contract-or-trying-to-run-a-node