hardhat.config.js

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

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
 module.exports = {
  networks: {
    localhost: {
      //Requires start of local network at port:
      url: "http://127.0.0.1:8545"
    },
    hardhat: {},
  },
  solidity: {
    compilers: [
      {
        version: "0.7.1",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200
          }
        },
      },
      {
        version: "0.8.1",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200
          },
        },
      },
      {
        version: "0.8.7",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200
          },
        },
      },
      {
        version: "0.6.4",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200
          },
        },
      },
    ],
  },
  mocha: {
    timeout: 10000000
  }
};