Truffle Example

npm install -g truffle

npm install -g webpack

truffle unbox webpack

pragma solidity >=0.4.21 <0.7.0;

contract newContract{
    function multiply(uint a) returns(uint d){
        return a * 7;
    }
}

const newContract = artifacts.require("newContract");
module.exports = async function(deployer) {
    await deployer.deploy(newContract);
};

npm init

npm install babel-register truffle-hdwallet-provider --save

    /**
 * 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:
 *
 * truffleframework.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.
 *
 */

// const HDWallet = require('truffle-hdwallet-provider');
// const infuraKey = "fj4jll3k.....";
//
// const fs = require('fs');
// const mnemonic = fs.readFileSync(".secret").toString().trim();

const fs = require('fs');
const mnemonic = fs.readFileSync(".secret").toString().trim(); //.secret   Mnemonic Phrase
var HDWalletProvider = require("truffle-hdwallet-provider");
require('babel-register')

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>
     */

    networks: {
        // Useful for testing. The `development` name is special - truffle uses it by default
        // if it's defined here and no other network is specified at the command line.
        // You should run a client (like ganache-cli, geth or parity) in a separate terminal
        // tab if you use this network and you must also set the `host`, `port` and `network_id`
        // options below to some value.
        //
        // development: {
        //  host: "127.0.0.1",     // Localhost (default: none)
        //  port: 8545,            // Standard Ethereum port (default: none)
        //  network_id: "*",       // Any network (default: none)
        // },
        
        // develop: {
        //   port: 8545
        // },

        networkName: {
            provider: () => new HDWalletProvider(mnemonic, `https://apis.ankr.com/xxxxx/xxxxx/eth/archive/main`),
            network_id: 1, // network's Chain id
            gas: 4612388, // Chain 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 )
        },

        // 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])
        // websockets: 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"
        // }
        }
    }
}