Factor out PromiseUtils

src/PromiseUtils.js

@@ -0,0 +1,15 @@
+import isPromise from 'is-promise';
+
+const UNRESOLVED = {};
+
+export function checkResolved(value) {
+  if (!isPromise(value)) {
+    return value;
+  }
+
+  return Promise.race([value, UNRESOLVED]);
+}
+
+export function isResolved(value) {
+  return value !== UNRESOLVED;
+}

src/index.js

@@ -13,6 +13,7 @@ export HttpError from './HttpError';
 export Link from './Link';
 export Matcher from './Matcher';
 export matchReducer from './matchReducer';
+export PromiseUtils from './PromiseUtils';
 export Redirect from './Redirect';
 export RedirectException from './RedirectException';
 export resolveElements from './resolveElements';

src/resolveElements.js

@@ -2,19 +2,7 @@ import isPromise from 'is-promise';
 import React from 'react';
 import warning from 'warning';
 
-const UNRESOLVED = {};
-
-function checkResolved(value) {
-  if (!isPromise(value)) {
-    return value;
-  }
-
-  return Promise.race([value, UNRESOLVED]);
-}
-
-function isResolved(value) {
-  return value !== UNRESOLVED;
-}
+import { checkResolved, isResolved } from './PromiseUtils';
 
 function createElements(match, Components, matchData) {
   const { routes, routeParams: matchRouteParams } = match;