truffle-config.ovm.js

// create a file at the root of your project and name it .env -- there you can set process variables
// like the mnemomic below. Note: .env is ignored by git in this project to keep your private information safe
require('dotenv').config();

const ganacheMnemonic = process.env.GANACHE_MNEMONIC;
const mnemonic = 'test test test test test test test test test test test junk'; // process.env["MNEMONIC"];

// Hard-coded secrets
const kovanMnemonic = process.env.KOVAN_MNEMONIC;
const infuraKey = process.env.INFURA_KEY;

// uncomment to use mainnetMnemonic, be sure to set it in the .env file
const mainnetMnemonic = process.env.MAINNET_MNEMONIC;

const { ganache } = require('@eth-optimism/plugins/ganache');
const HDWalletProvider = require('@truffle/hdwallet-provider');

module.exports = {

  /**
  * contracts_build_directory tells Truffle where to store compiled contracts
  */
  contracts_build_directory: './build/optimism-contracts',

  /**
  *  contracts_directory tells Truffle where to find your contracts
  */
  contracts_directory: './contracts',

  test_directory: './test',

  networks: {
    development: {
      url: 'http://127.0.0.1:7545',
      network_id: '*'
    },
    ganache: {
      network_id: 108,
      networkCheckTimeout: 100000,
      provider: () => (
        ganache.provider({
          mnemonic: ganacheMnemonic,
          network_id: 108,
          default_balance_ether: 100
        })
      )
    },
    // for use with local environment -- see README and list of available
    // scripts in package.json for steps to get this running on your local machine
    optimistic_ethereum: {
      network_id: 420,
      gas: 15000000,
      provider: () => (
        new HDWalletProvider({
          mnemonic: {
            phrase: mnemonic
          },
          providerOrUrl: 'http://127.0.0.1:8545/',
          addressIndex: 0,
          numberOfAddresses: 1,
          chainId: 420
        })
      )
    },
    optimistic_kovan: {
      network_id: 69,
      chain_id: 69,

      gas: 0,
      gasPrice: 15000000,
      provider: () => (new HDWalletProvider(kovanMnemonic, `https://optimism-kovan.infura.io/v3/${infuraKey}`, 1, 5))
      // Error: while migrating SimpleStorage: fee too low: 15000000000000, use at least tx.gasLimit = 3300000 and tx.gasPrice = 15000000
    },
    // requires a mainnet mnemonic; you can save this in .env or in whatever secure location
    // you wish to use
    optimistic_mainnet: {
      network_id: 10,
      chain_id: 10,
      provider: () => (new HDWalletProvider(mainnetMnemonic, `https://optimism-mainnet.infura.io/v3/${infuraKey}`, 1, 1))
    }
  },

  mocha: {
    timeout: 100000
  },
  compilers: {
    solc: {
      version: 'node_modules/@eth-optimism/solc',
      settings: {
        optimizer: {
          enabled: true,
          runs: 800
        }
      }
    }
  },
  db: {
    enabled: false
  }
};