truffle-config.js

const path = require('path');
const HDWalletProvider = require('truffle-hdwallet-provider');
const mnemonic = 'Add your 14 works MetaMask secret passphrase';

module.exports = {
    contracts_build_directory: path.join(__dirname, 'client/src/contracts'),
    networks: {
        development: {
            host: '127.0.0.1',
            port: 7545,
            network_id: '*', //match any network id
        },
        kovan: {
            provider: () =>
                new HDWalletProvider(mnemonic, `https://kovan.infura.io/v3/1c588cd8b6684287ad15ddb7e8b48d53`, 5),
            network_id: 42,
        },
        rinkeby: {
            provider: () => new HDWalletProvider(mnemonic, `https://rinkeby.infura.io/v3/`, 5),
            network_id: 4,
        },
        bsctest: {
            provider: () => new HDWalletProvider(mnemonic, `https://data-seed-prebsc-1-s1.binance.org:8545`, 11),
            network_id: 97,
        },
        matic: {
            provider: () => new HDWalletProvider(mnemonic, `https://rpc-mumbai.maticvigil.com`),
            network_id: 80001,
            confirmations: 2,
            timeoutBlocks: 200,
            skipDryRun: true,
        },
        bsc: {
            provider: () => new HDWalletProvider(mnemonic, `https://bsc-dataseed1.binance.org`),
            network_id: 56,
            confirmations: 10,
            timeoutBlocks: 200,
            skipDryRun: true,
        },
    },
    // Configure your compilers
    compilers: {
        solc: {
            optimizer: {
                enabled: true,
                runs: 200,
            },
            version: '^0.8.0',
        },
    },
};