truffle-config.js

const path = require("path");

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  contracts_build_directory: path.join(__dirname, "client/src/contracts"),
  networks: {
    develop: {
      port: 8545
    },
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*" // Match any network id
    },
  },
  compilers: {
    solc: {
      version: ">=0.4.0 <0.9.0",
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  }
};