Error while installing hardhat dependencies.

[coder-rancho]

I was following lesson 9

Below is the list of commands that I executed.

npm init --y

npm install --save-dev  @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers @nomiclabs/hardhat-etherscan @nomiclabs/hardhat-waffle chai ethereum-waffle hardhat hardhat-contract-sizer hardhat-deploy hardhat-gas-reporter prettier prettier-plugin-solidity solhint solidity-coverage dotenv

after which I got this error

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR!
npm ERR! While resolving: hardhat-lottery@1.0.0
npm ERR! Found: @nomiclabs/hardhat-ethers@0.3.0-beta.13
npm ERR! node_modules/@nomiclabs/hardhat-ethers
npm ERR!   dev @nomiclabs/hardhat-ethers@"npm:hardhat-deploy-ethers" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! dev @nomiclabs/hardhat-waffle@"*" from the root project
npm ERR!
npm ERR! Conflicting peer dependency: @nomiclabs/hardhat-ethers@2.0.6
npm ERR! node_modules/@nomiclabs/hardhat-ethers
npm ERR!   peer @nomiclabs/hardhat-ethers@"^2.0.0" from @nomiclabs/hardhat-waffle@2.0.3
npm ERR!   node_modules/@nomiclabs/hardhat-waffle
npm ERR!     dev @nomiclabs/hardhat-waffle@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See C:\Users\Dell\AppData\Local\npm-cache\eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Dell\AppData\Local\npm-cache\_logs\2022-06-16T18_21_57_075Z-debug-0.log

[mattjaf]

try npm install --save-dev --legacy-peer-deps @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers @nomiclabs/hardhat-etherscan @nomiclabs/hardhat-waffle chai ethereum-waffle hardhat hardhat-contract-sizer hardhat-deploy hardhat-gas-reporter prettier prettier-plugin-solidity solhint solidity-coverage dotenv

Here an article on --legacy-peer-deps that might be helpful

https://stackoverflow.com/questions/66239691/what-does-npm-install-legacy-peer-deps-do-exactly-when-is-it-recommended-wh

[PatrickAlphaC]

Also, why not use yarn?

[coder-rancho]

Does it make any difference to choose yarn over npm.

[gmluqa]

Yarn is faster from what I've researched online

[PatrickAlphaC]

@coder-rancho - actually, sometimes it does. There are certain packages that only work on one or the other.

Crazy right?

[DmitryLavrov]

It looks like the problem is because of @nomiclabs/hardhat-ethers@0.3.0-beta.13
The recommendation is to install it last.

This package should replace "ethers".
So the command string is

npm i -D @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers

[TradMod]

Bro did you find any solution I'm facing the same issue rn

[TradMod]

I was facing the same issue on the same lesson (9) but with installing @Chainlink/contracts so I used --force thing to install that.
Not the best solution may be but by adding --force at the end at least its gets added :)

I tried this: npm install @chainlink/contracts --save --force.

Maybe for you, this work IA: npm install --save-dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers @nomiclabs/hardhat-etherscan @nomiclabs/hardhat-waffle chai ethereum-waffle hardhat hardhat-contract-sizer hardhat-deploy hardhat-gas-reporter prettier prettier-plugin-solidity solhint solidity-coverage dotenv --force

[DorianDaSilva]

yarn add hardhat --dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers @nomiclabs/hardhat-etherscan @nomiclabs/hardhat-waffle chai ethereum-waffle hardhat hardhat-contract-sizer hardhat-deploy hardhat-gas-reporter prettier prettier-plugin-solidity solhint solidity-coverage dotenv

If it doesn't work run it without the --dev

=====================================================================================

Install yarn:
https://classic.yarnpkg.com/en/docs/install#windows-stable