truffle.js

const HDWalletProvider = require('@truffle/hdwallet-provider');

const MNEMONIC = process.env.MNEMONIC;
const INFURA_KEY = process.env.INFURA_KEY;
const needsNodeAPI =
  process.env.npm_config_argv &&
  (process.env.npm_config_argv.includes("rinkeby") ||
    process.env.npm_config_argv.includes("live"));

if ((!MNEMONIC || !INFURA_KEY) && needsNodeAPI) {
  console.error("Please set a mnemonic and INFURA_KEY.");
  process.exit(0);
}

/**
 * Use this file to configure your truffle project. It's seeded with some
 * common settings for different networks and features like migrations,
 * compilation and testing. Uncomment the ones you need or modify
 * them to suit your project as necessary.
 *
 * More information about configuration can be found at:
 *
 * trufflesuite.com/docs/advanced/configuration
 *
 * To deploy via Infura you'll need a wallet provider (like @truffle/hdwallet-provider)
 * to sign your transactions before they're sent to a remote public node. Infura accounts
 * are available for free at: infura.io/register.
 *
 * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
 * public/private key pairs. If you're publishing your code to GitHub make sure you load this
 * phrase from a file you've .gitignored so it doesn't accidentally become public.
 *
 */

module.exports = {
  /**
   * Networks define how you connect to your ethereum client and let you set the
   * defaults web3 uses to send transactions. If you don't specify one truffle
   * will spin up a development blockchain for you on port 9545 when you
   * run `develop` or `test`. You can ask a truffle command to use a specific
   * network from the command line, e.g
   *
   * $ truffle test --network <network-name>
   */
  // contracts_build_directory: './frontend/src/contracts',
  contracts_build_directory: process.env.CONTRACTS_BUILD,
  contracts_directory: process.env.CONTRACTS_DIR,

  networks: {
    rinkeby: {
      provider: () => new HDWalletProvider(
        MNEMONIC,
        "https://rinkeby.infura.io/v3/" + INFURA_KEY,
        0,
        1
      ),
      network_id: 4, //rinkeby
      skipDryRun: false
    },
    mumbai: {
      provider: () => new HDWalletProvider({
        mnemonic: {
          phrase: MNEMONIC
        },
        providerOrUrl:
          "https://polygon-mumbai.infura.io/v3/" + INFURA_KEY
      }),
      network_id: 80001,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    polygon: {
      provider: () => new HDWalletProvider({
        mnemonic: {
          phrase: MNEMONIC
        },
        providerOrUrl:
          "https://polygon-mainnet.infura.io/v3/" + INFURA_KEY
      }),
      network_id: 137,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true,
      chainId: 137
    },
    ethereum: {
      provider: () => new HDWalletProvider(
        MNEMONIC,
        "https://mainnet.infura.io/v3/" + INFURA_KEY,
        0,
        1
      ),
      network_id: 1, //mainnet
      skipDryRun: false,
      gas: 5000000, // might have to play with
      gasPrice: 5000000000, // might have to play with
    },
  },

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

  // Configure your compilers
  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"
      // }
    }
  }
};