Seeds allow you to insert some random data to your app, So lets say you want to insert some default Roles into your app, so you can pass seeds by

let configuration = {
  // rest of the configuration
  seeds: {
    Role: [{ name: "My Role" }, { name: "My Role #2" }],

So, you have added, After initializetion of wertik-js you can run seeds by:

import wertik from "./main";
wertik({ expressApp: app }, defaultConfiguration).then((wertikApp: any) => {
  wertikApp.seeds(["Role"]); // Same name goes for

This will insert module seeds.