Lesson:7 Cannot find module 'dotenv'

[Shawon-Mandal]

While setting up hardhat I selected "Create a javascript project"

And now when I try to run command "yarn hardhat" I get this error:"Error: Cannot find module 'dotenv' "

[othaime-en]

Try reinstallling the module again. Run yarn add --dev dotenv

[Shawon-Mandal]

At first when it couldnt find the "dotenv" file,I tried copy pasting it.But it didnt work so,I reinstalled hardhat.Right now Its the same package when I first installed it.

here is my package.json file

[othaime-en]

Oh. The problem here i'm guessing is you forgot to install the node_modules. You simply copied and pasted them. To solve the problem,
Run yarn

[Shawon-Mandal]

my yarn is showing already up to date

[Shawon-Mandal]

Can I just install the "node_modules" by running any specific command?

[othaime-en]

Where did you copy and paste the package.json file from?
To make this easier for you, and avoid confusion in installing these modules. Just use the modules used in the lesson repo.
Replace your packages.json file with this

"devDependencies": {
    "@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers@^0.3.0-beta.13",
    "@nomiclabs/hardhat-etherscan": "^3.0.0",
    "@nomiclabs/hardhat-waffle": "^2.0.2",
    "chai": "^4.3.4",
    "ethereum-waffle": "^3.4.0",
    "ethers": "^5.5.3",
    "hardhat": "^2.8.3",
    "hardhat-deploy": "^0.9.29",
    "hardhat-gas-reporter": "^1.0.7",
    "solidity-coverage": "^0.7.18",
    "@chainlink/contracts": "^0.3.1",
    "dotenv": "^14.2.0",
    "prettier-plugin-solidity": "^1.0.0-beta.19"
  }

Your Hardhat.config.js should start like this.

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

...

Afterwards, run yarn to install all these modules.

[krakxn]

"Cannot find module..." is either not importing the package, or not having the package installed.

In this case--assuming you have the dependency in your package.json already--running yarn install should install all the dependencies in your package.json file.

[shoaibshebi]

@Shawon-Mandal
Delete the node_modules dir and yarn.lock and then run this fresh yarn install