How to use the remeda.flatMap function in remeda

import React, { useEffect, useState } from 'react';
import * as R from 'remeda';
import { usePrevious } from 'src/hooks/usePrevious';
import { RouteConfig } from 'src/types';
import { useActions, useMappedState } from 'typeless';
import { getRouterState, RouterActions, RouterLocation } from 'typeless-router';
import { getGlobalState } from 'src/features/global/interface';

// load dynamically all routes from all interfaces
const req = require.context('../features', true, /interface.tsx?$/);

const routes = R.flatMap(req.keys(), key => {
  const module = req(key);
  const items = Object.values(module);
  return items.filter((item: any) => item.type === 'route') as RouteConfig[];
});

function getMatch(loc: RouterLocation | null, isLogged: boolean) {
  if (!loc) {
    return null;
  }
  return routes.find(route => {
    if ((route.auth && !isLogged) || (!route.auth && isLogged)) {
      return false;
    }
    return route.path === loc.pathname;
  });
}