Hardhat – Argument of Type ‘HardhatEthersSigner’ Not Assignable to Parameter of Type ‘String | Signer | Undefined’

hardhattypescriptunittesting

I'm writing unit tests for an ERC20 token in TypeScript. I'm getting this error from TypeScript:

Argument of type 'HardhatEthersSigner' is not assignable to parameter
of type 'string | Signer | undefined'.

Here's my code:

import { assert, expect } from "chai";
import { deployments, ethers } from "hardhat";
import { MyToken } from "../../typechain-types";
import { SignerWithAddress } from "@nomicfoundation/hardhat-ethers/signers";
import { Signer } from "ethers";

const INITIAL_SUPPLY = 20;

describe("MyToken Unit Test", function () {
  let myToken: MyToken;
  let deployer:SignerWithAddress;
  let userOne: SignerWithAddress;

  beforeEach(async function () {
    const accounts = await ethers.getSigners();
    deployer = accounts[0];
    userOne = accounts[1];

    await deployments.fixture("all");
    myToken = await ethers.getContract("MyToken", deployer);
  });

  .
  .
  .

});

I have tried typecasting from SignerWithAddress to Signer but it does not work. I also tried making deployer a union type by using let deployer:Signer|SignerWithAddress; but it doesn't work either.

So far the only solution I have is making the deployer's type as any but it's not a good practice.

Additional information:

Solidity compiler version: 0.8.21

Best Answer

Ran into this and then another issue related to the v6 migration. Once I installed ethers as a dependency (yarn add -D ethers), I was able to get this to work.

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