create-installer.js

// @flow
import type { History } from 'history';
import type { Location } from '../types';

import { default as matcherFactory } from '../util/create-matcher';
import validateRoutes from '../util/validate-routes';
import flattenRoutes from '../util/flatten-routes';

type CreateInstallArgs = {|
  reducer: Function,
  middleware: Function,
  enhancer: Function
|};

type InstallArgs = {|
  routes: Object,
  history: History,
  location: Location,
  createMatcher?: Function
|};

export default ({ reducer, middleware, enhancer }: CreateInstallArgs) =>
  ({
    routes: nestedRoutes,
    history,
    location,
    createMatcher = matcherFactory
  }: InstallArgs) => {
    validateRoutes(nestedRoutes);
    const routes = flattenRoutes(nestedRoutes);
    const matchRoute = createMatcher(routes);

    return {
      reducer: reducer({
        routes,
        initialLocation: {
          ...location,
          ...matchRoute(location.pathname)
        }
      }),
      middleware: middleware({ history }),
      enhancer: enhancer({
        history,
        matchRoute,
        createMatcher
      })
    };
  };