truffle-config.js

const path = require("path");
const { projectId, mnemonic } = require('./secrets.json');
const HDWalletProvider = require('@truffle/hdwallet-provider');

module.exports = {
  contracts_build_directory: path.join(__dirname, "client/src/contracts"),
  compilers: {
    solc: {
      version: "^0.8.0",
    }
  },
  networks: {
    develop: {
      port: 8545,
      host: "127.0.0.1",
      network_id: "*",
      gas: 5500000
    },
    rinkeby: { // get eth from https://rinkebyfaucet.com/
      provider: () => new HDWalletProvider(mnemonic, `wss://rinkeby.infura.io/ws/v3/${projectId}`),
      network_id: 4,       // Ropsten's id
      gas: 5500000,        // Ropsten has a lower block limit than mainnet
      confirmations: 2,    // # of confs to wait between deployments. (default: 0)
      timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
      skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
    },    
    matic: {
      provider: () => new HDWalletProvider(mnemonic, `https://matic-mumbai.chainstacklabs.com/`), // get tokens: https://faucet.polygon.technology/
      network_id: 80001,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  }
}