hardhat.config.js

require("@nomiclabs/hardhat-waffle");

// The next line is part of the sample project, you don't need it in your
// project. It imports a Hardhat task definition, that can be used for
// testing the frontend.
require("./tasks/faucet");

const defaultNetwork = "localhost";

function mnemonic() {
  try {
    return fs.readFileSync("./mnemonic.txt").toString().trim();
  } catch (e) {
    if (defaultNetwork !== "localhost") {
      console.log(
        "☢️ WARNING: No mnemonic file created for a deploy account. Try `yarn run generate` and then `yarn run account`."
      );
    }
  }
  return "";
}

module.exports = {
  defaultNetwork,
  networks: {
    localhost: {
      url: "http://localhost:8545",
      /*
        notice no mnemonic here? it will just use account 0 of the hardhat node to deploy
        (you can put in a mnemonic here to set the deployer locally)
      */
    },
    rinkeby: {
      url: "https://rinkeby.infura.io/v3/460f40a260564ac4a4f4b3fffb032dad", // <---- YOUR INFURA ID! (or it won't work)
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    kovan: {
      url: "https://kovan.infura.io/v3/460f40a260564ac4a4f4b3fffb032dad", // <---- YOUR INFURA ID! (or it won't work)
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    mainnet: {
      url: "https://mainnet.infura.io/v3/460f40a260564ac4a4f4b3fffb032dad", // <---- YOUR INFURA ID! (or it won't work)
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    ropsten: {
      url: "https://ropsten.infura.io/v3/460f40a260564ac4a4f4b3fffb032dad", // <---- YOUR INFURA ID! (or it won't work)
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    goerli: {
      url: "https://goerli.infura.io/v3/460f40a260564ac4a4f4b3fffb032dad", // <---- YOUR INFURA ID! (or it won't work)
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    xdai: {
      url: "https://rpc.xdaichain.com/",
      gasPrice: 1000000000,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    matic: {
      url: "https://rpc-mainnet.maticvigil.com/",
      gasPrice: 1000000000,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    rinkebyArbitrum: {
      url: "https://rinkeby.arbitrum.io/rpc",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      companionNetworks: {
        l1: "rinkeby",
      },
    },
    localArbitrum: {
      url: "http://localhost:8547",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      companionNetworks: {
        l1: "localArbitrumL1",
      },
    },
    localArbitrumL1: {
      url: "http://localhost:7545",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      companionNetworks: {
        l2: "localArbitrum",
      },
    },
    kovanOptimism: {
      url: "https://kovan.optimism.io",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      ovm: true,
      companionNetworks: {
        l1: "kovan",
      },
    },
    localOptimism: {
      url: "http://localhost:8545",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      ovm: true,
      companionNetworks: {
        l1: "localOptimismL1",
      },
    },
    localOptimismL1: {
      url: "http://localhost:9545",
      gasPrice: 0,
      accounts: {
        mnemonic: mnemonic(),
      },
      companionNetworks: {
        l2: "localOptimism",
      },
    },
  },
  solidity: {
    compilers: [
      {
        version: "0.8.0",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
    ],
  },
  ovm: {
    solcVersion: "0.7.6",
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
    },
  },
};