truffle-config.js

const path = require('path');
const HDWalletProvider = require('@truffle/hdwallet-provider');
const mnemonic = “Enter you 14 words wallet passphrase”;

module.exports = {
    // See <http://truffleframework.com/docs/advanced/configuration>
    // to customize your Truffle configuration!
    contracts_build_directory: path.join(__dirname, 'client/src/contracts'),
    networks: {
        development: {
            host: '127.0.0.1',
            port: 7545,
            network_id: '*', //match any network id
        },
        matic: {
            provider: () => new HDWalletProvider(mnemonic, `https://rpc-mumbai.maticvigil.com`),
            network_id: 80001,
            confirmations: 2,
            timeoutBlocks: 200,
            skipDryRun: true
        },

    },
    // Configure your compilers
    compilers: {
        solc: {
            optimizer: {
                enabled: true,
                runs: 200,
            },
            version: '^0.8.0',
        },
    },
};