The following assumes the use of node@>=14.

1. Copy .env.example file and change its name to .env in the project folder
2. Run npm i to install all dependencies

npx hardhat compile

Note: There will be a new folder called typechain generated in your project workspace. You will need to navigate to typechain/index.ts and delete duplicated lines inside this file in order to proceed.

npx hardhat test <files to test>

To try out Etherscan verification, you first need to deploy a contract to an Ethereum network that's supported by Etherscan, such as Goerli.

In this project, copy the .env.example file to a file named .env, and then edit it to fill in the details. Enter your Etherscan API key, your Goerli node URL (eg from Alchemy), and the private key of the account which will send the deployment transaction. With a valid .env file in place, first deploy your contract:

hardhat run --network kovan scripts/sample-script.ts

Then, copy the deployment address and paste it in to replace DEPLOYED_CONTRACT_ADDRESS in this command:

npx hardhat verify --network goerli <address> <unlock time>

For faster runs of your tests and scripts, consider skipping ts-node's type checking by setting the environment variable TS_NODE_TRANSPILE_ONLY to 1 in hardhat's environment. For more details see the documentation.