truffle-config.js

const HDWalletProvider = require("@truffle/hdwallet-provider");
const path = require("path");
require("dotenv").config();
const PRIVATE_KEY = process.env.PRIVATE_KEY;

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  contracts_build_directory: path.join(__dirname, "client/src/contracts"),
  networks: {
    // -------------- TESTNET ---------------------
    mumbai: {
      provider: () =>
        new HDWalletProvider(PRIVATE_KEY, `https://rpc-mumbai.maticvigil.com`),
      network_id: 80001,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true,
    },
    development: {
      host: "localhost", // Localhost (default: none)
      port: 8545, // Standard Ethereum port (default: none)
      network_id: "*", // Any network (default: none)
    },
  },
  compilers: {
    solc: {
      version: "^0.8.0", // Fetch exact version from solc-bin (default: truffle's version)
      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
      // settings: {          // See the solidity docs for advice about optimization and evmVersion
      //  optimizer: {
      //    enabled: false,
      //    runs: 200
      //  },
      //  evmVersion: "byzantium"
      // }
    },
  },
};