truffle-config.js

const homedir = require('os').homedir
const path = require('path')

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

const DEFAULT_MNEMONIC =
  'explain tackle mirror kit van hammer degree position ginger unfair soup bonus'

const defaultRPC = network => `https://${network}.eth.aragon.network`

const configFilePath = filename => path.join(homedir(), `.aragon/${filename}`)

const mnemonic = () => {
  try {
    return require(configFilePath('mnemonic.json')).mnemonic
  } catch (e) {
    return DEFAULT_MNEMONIC
  }
}

const settingsForNetwork = network => {
  try {
    return require(configFilePath(`${network}_key.json`))
  } catch (e) {
    return {}
  }
}

// Lazily loaded provider
const providerForNetwork = network => () => {
  let { rpc, keys } = settingsForNetwork(network)
  rpc = rpc || defaultRPC(network)

  if (!keys || keys.length === 0) {
    return new HDWalletProvider(mnemonic(), rpc)
  }

  return new HDWalletProvider(keys, rpc)
}

const mochaGasSettings = {
  reporter: 'eth-gas-reporter',
  reporterOptions: {
    currency: 'USD',
    gasPrice: 3,
  },
}

const mocha = process.env.GAS_REPORTER ? mochaGasSettings : {}

module.exports = {
  networks: {
    matic: {
      network_id: 137,
      provider: providerForNetwork('matic'),
      gasPrice: 200e9
    }
  },
  build: {},
  mocha,
  solc: {
    optimizer: {
      // See the solidity docs for advice about optimization and evmVersion
      // https://solidity.readthedocs.io/en/v0.5.12/using-the-compiler.html#setting-the-evm-version-to-target
      enabled: true,
      runs: 10000,   // Optimize for how many times you intend to run the code
    },
  },
}