truffle-config.js

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

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard BSC port (default: none)
      network_id: "*",       // Any network (default: none)
    },
    testnet: {
      provider: () => new HDWalletProvider(process.env.TESTNET_DEPLOYER_KEY, `https://data-seed-prebsc-1-s1.binance.org:8545`, 0, 10),
      network_id: 97,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true,
    },
    bsc: {
      provider: () => new HDWalletProvider(process.env.MAINNET_DEPLOYER_KEY, `https://bscrpc.com`),
      network_id: 56,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    polygon: {
      provider: () => new HDWalletProvider(process.env.MAINNET_DEPLOYER_KEY, `https://polygon-rpc.com/`),
      network_id: 137,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    polygonTestnet: {
      provider: () => new HDWalletProvider(process.env.TESTNET_DEPLOYER_KEY, `https://rpc-mumbai.matic.today`),
      network_id: 80001,
      confirmations: 2,
      gasPrice: 4000000000,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    eth: {
      provider: () => new HDWalletProvider(process.env.MAINNET_DEPLOYER_KEY, `https://rpc.ankr.com/eth`),
      network_id: 1,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    ropsten: {
      provider: () => new HDWalletProvider(process.env.TESTNET_DEPLOYER_KEY, process.env.ROPSTEN_RPC),
      network_id: 3,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    arbitrum: {
      provider: () => new HDWalletProvider(process.env.MAINNET_DEPLOYER_KEY, `https://arbitrum.blockpi.network/v1/rpc/public`),
      network_id: `42161`,
      confirmations: 2,
      gasPrice: 1e8,
      timeoutBlocks: 200,
      skipDryRun: false
    },
  },
  plugins: [
    'truffle-plugin-verify'
  ],
  api_keys: {
    etherscan: process.env.ETHERSCAN_API_KEY,
    bscscan: process.env.BSCSCAN_API_KEY,
    arbiscan: process.env.ARBISCAN_API_KEY,
  },

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

  // Configure your compilers
  compilers: {
    solc: {
      //https://forum.openzeppelin.com/t/how-to-deploy-uniswapv2-on-ganache/3885
      version: "0.6.6",    // 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: true,
          runs: 999999
        },
        evmVersion: "istanbul",
        outputSelection: {
          "*": {
            "": [
              "ast"
            ],
            "*": [
              "evm.bytecode.object",
              "evm.deployedBytecode.object",
              "abi",
              "evm.bytecode.sourceMap",
              "evm.deployedBytecode.sourceMap",
              "metadata"
            ]
          },
        }
      }
    },
  }
}