chai is not working

[khushbusandhu]

i am getting this error while running unit test of raffle.sol

warning package.json: No license field
$ /home/khushbu/hardhat-smartContract_lottery/node_modules/.bin/hardhat test
An unexpected error occurred:

Error [ERR_REQUIRE_ESM]: require() of ES Module /home/khushbu/hardhat-smartContract_lottery/node_modules/chai/chai.js from /home/khushbu/hardhat-smartContract_lottery/test/unit/Raffle.test.js not supported.
Instead change the require of chai.js in /home/khushbu/hardhat-smartContract_lottery/test/unit/Raffle.test.js to a dynamic import() which is available in all CommonJS modules.
    at Object.<anonymous> (/home/khushbu/hardhat-smartContract_lottery/test/unit/Raffle.test.js:2:28)
    at /home/khushbu/hardhat-smartContract_lottery/node_modules/mocha/lib/mocha.js:414:36
    at Array.forEach (<anonymous>)
    at Mocha.loadFiles (/home/khushbu/hardhat-smartContract_lottery/node_modules/mocha/lib/mocha.js:411:14)
    at Mocha.run (/home/khushbu/hardhat-smartContract_lottery/node_modules/mocha/lib/mocha.js:972:10)
    at testFailures (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/builtin-tasks/test.js:102:15)
    at new Promise (<anonymous>)
    at SimpleTaskDefinition.action (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/builtin-tasks/test.js:101:32)
    at async Environment._runTaskDefinition (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:228:20)
    at async Environment._runTaskDefinition (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:228:20)
    at async Environment.run (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:91:24)
    at async SimpleTaskDefinition.action (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/builtin-tasks/test.js:127:26)
    at async Environment._runTaskDefinition (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:228:20)
    at async Environment._runTaskDefinition (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:228:20)
    at async Environment.run (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/core/runtime-environment.js:91:24)
    at async main (/home/khushbu/hardhat-smartContract_lottery/node_modules/hardhat/internal/cli/cli.js:201:13) {
  code: 'ERR_REQUIRE_ESM'
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

here is my test file

const { network, deployments, ethers } = require("hardhat")
const { assert, expect } = require("chai")
const { developmentChains, networkConfig } = require("../../helper-hardhat-config")

describe("Raffle unit test", async function () {
    let raffle, vrfCoordinatorV2, raffleEntranceFee
    const chainId = network.config.chainId
    beforeEach(async function () {
        accounts = await ethers.getSigners()
        const player = accounts[0]

        await deployments.fixture(["all", "Raffle"])
        const raffleContract = await ethers.getContract("Raffle")
        raffle = raffleContract.connect(player)
        vrfCoordinatorV2 = await ethers.getContract("VRFCoordinatorV2Mock")
        raffleEntranceFee = raffle.getEntranceFee()
    })
    describe("constructor", async function () {
        it("initializes the Raffle Correctly", async function () {
            const raffleState = (await raffle.getRaffleState()).toString()
            const interval = await raffle.getInterval()
            assert.equal(raffleState, "0")
            assert.equal(interval.toString(), networkConfig[chainId]["interval"])
        })
    })
    describe("enterRaffle", async function () {
        it("reverts when you dont pay enough", async function () {
            await expect(raffle.enterRaffle()).to.be.revertedWith(Raffle__NotEnoughEthEntered())
        })
        it("records player when they entered", async function () {
            await raffle.enterRaffle({ value: raffleEntranceFee })
            const playerFromContract = await raffle.getPlayer(0)
            assert.equal(playerFromContract, deployer)
        })
    })
})

[bobbywilliamajor]

When we started this project unlike from the previous one we did not opt for a default hardhatConfig file that comes with certain packages already installed such as hard-toolbox which comes with most of the packages needed. This tutorial was from two years back when hardhat toolbox was not yet a thing, the default hardhatConfig comes hardhat-toolbox which will help us manage the chai-matchers package. So instead of downloading all the packages using the method suggested in the tutorial you can open a new directory start a new hardhat project and opt for the boilerplate hardhatConfig file then copy all your code to the new directory using the same paths.

[khushbusandhu]

how can I do that? like if you can suggest any documentation etc.

[bobbywilliamajor]

Just do what you did on the last hardhat project. When installing hardhat you will be asked whether you want a default hardhat config file, select yes like you did on the last hardhat project.

[bobbywilliamajor]

Select Create a Javascript project.
This will come with chai and other packages already installed then you can simply transfer the code you wrote to this new project.

[SanmeetShah]

Just change the version of chai to
4.3.7
and then run the command
yarn
in the terminal which will install this version of chai
it worked for me