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Minimizing Bundle Size

For convenience, React Router exposes its full API on the top-level react-router import. However, this causes the entire React Router library and its dependencies to be included in client bundles that include code that imports from the top-level CommonJS bundle.

Instead, the bindings exported from react-router are also available in react-router/lib. When using CommonJS modules, you can import directly from react-router/lib to avoid pulling in unused modules.

Assuming you are transpiling ES2015 modules into CommonJS modules, instead of:

import { Link, Route, Router } from 'react-router'

use:

import Link from 'react-router/lib/Link'
import Route from 'react-router/lib/Route'
import Router from 'react-router/lib/Router'

The public API available in this manner is defined as the set of imports available from the top-level react-router module. Anything not available through the top-level react-router module is a private API, and is subject to change without notice.