truffle-config.js

const HDWalletProvider = require("@truffle/hdwallet-provider");
const { mnemonic } = require("./secretsManager.js");

const providerProxyHandler = (rpcUrl, provider) => {
  const get = (_target, property) => {
    if (!provider) {
      provider = new HDWalletProvider(mnemonic, rpcUrl, 0);
    }
    return provider[property];
  };
  return { get };
};

const lazyCreateNetwork = (rpcUrl) => {
  let provider = undefined;
  return new Proxy({}, providerProxyHandler(rpcUrl, provider));
};

module.exports = {
  networks: {
    polygon: {
      network_id: 137,
      provider: lazyCreateNetwork("https://rpc-mainnet.matic.network"),
      gasPrice: 1000000000, // 1 gwei
      skipDryRun: true,
    },
    mumbai: {
      network_id: 80001,
      //       provider: lazyCreateNetwork("https://rpc-mumbai.matic.today"),
      provider: lazyCreateNetwork("https://rpc-mumbai.maticvigil.com/"),
      //provider: lazyCreateNetwork("https://matic-mumbai.chainstacklabs.com"),
      // provider: lazyCreateNetwork("https://matic-testnet-archive-rpc.bwarelabs.com"),
      gasPrice: 1000000000, // 1 gwei
      skipDryRun: true,
    },
    development: {
      host: "127.0.0.1", // Localhost (default: none)
      port: 9545, // Standard Ethereum port (default: none)
      network_id: "*", // Any network (default: none)
    },
    // Another network with more advanced options...
    // advanced: {
    // port: 8777,             // Custom port
    // network_id: 1342,       // Custom network
    // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
    // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
    // from: <address>,        // Account to send txs from (default: accounts[0])
    // websocket: true        // Enable EventEmitter interface for web3 (default: false)
    // },
    // Useful for deploying to a public network.
    // NB: It's important to wrap the provider as a function.
    // ropsten: {
    // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
    // network_id: 3,       // 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 )
    // },
    // Useful for private networks
    // private: {
    // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
    // network_id: 2111,   // This network is yours, in the cloud.
    // production: true    // Treats this network as if it was a public net. (default: false)
    // }
  },

  // Set default mocha options here, use special reporters etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      // version: "0.5.1",    // 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"
      // }
    },
  },

  // Truffle DB is currently disabled by default; to enable it, change enabled: false to enabled: true
  //
  // Note: if you migrated your contracts prior to enabling this field in your Truffle project and want
  // those previously migrated contracts available in the .db directory, you will need to run the following:
  // $ truffle migrate --reset --compile-all

  db: {
    enabled: false,
  },
};