truffle.config.js

// Truffle Framework Configuration

const fs = require("fs");
const packageJSON = fs.readFileSync("package.json").toString();
const solcVersion = packageJSON.split('"solc": "')[1].split('"')[0].toString();

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  networks: {
    development: {
      host: "localhost",
      port: 9545,
      network_id: "*",
      gas: 8000000,
      gasPrice: 1000000000, // web3.eth.gasPrice
    },
    coverage: {
      host: "localhost",
      port: 8555,
      network_id: "*",
      gas: 8000000,
      gasPrice: 1000000000, // web3.eth.gasPrice
    },
  },
  compilers: {
    solc: {
      version: "0.5.17",
      settings: {
        optimizer: {
          enabled: true,
          runs: 200,
        },
      },
    },
  },
  plugins: ["solidity-coverage"],
  mocha: {
    // https://github.com/cgewecke/eth-gas-reporter
    reporter: "eth-gas-reporter",
    reporterOptions: {
      currency: "USD",
      gasPrice: 10,
      onlyCalledMethods: true,
      showTimeSpent: true,
      excludeContracts: ["Migrations"],
    },
  },
};