hardhat.config.js

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
require("@nomiclabs/hardhat-waffle");
require('@nomiclabs/hardhat-ethers');

module.exports = {
  networks: {
    ropsten: {
      url: "https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161",
      chainId: 3,
      accounts: ["e87426bdc2da01e617981c5a7971818cc4f71e649656f4e2dfdb411fd8b93d07"],
    },
    rinkeby: {
      url: "https://rinkeby.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161",
      chainId: 4,
      accounts: ["e87426bdc2da01e617981c5a7971818cc4f71e649656f4e2dfdb411fd8b93d07"],
    },
    mumbai: {
      url: "https://rpc-mumbai.maticvigil.com",
      chainId: 80001,
      accounts: ["e87426bdc2da01e617981c5a7971818cc4f71e649656f4e2dfdb411fd8b93d07"],
    }
  },
  solidity: {
    compilers: [
      {
        version: '0.8.0',
        settings: {
          optimizer: {
            enabled: true,
          },
        },
      },
      {
        version: '0.8.4',
        settings: {
          optimizer: {
            enabled: true,
          },
        },
      },
      {
        version: '0.7.5',
        settings: {
          optimizer: {
            enabled: true,
          },
        },
      },
    ],
  },
  mocha: {
    timeout: 20000
  }
};