Upgrade to Babel 6

.babelrc

@@ -1,7 +1,14 @@
 {
-  "stage": 0,
-  "loose": "all",
-  "plugins": [
-    "dev-expression"
-  ]
+  "presets": ["stage-0", "react"],
+  "plugins": ["dev-expression"],
+
+  "env": {
+    "cjs": {
+      "presets": ["es2015-loose"],
+      "plugins": ["add-module-exports"]
+    },
+    "es": {
+      "presets": ["es2015-loose-native-modules"]
+    }
+  }
 }

modules/PatternUtils.js

@@ -94,37 +94,29 @@ export function matchPattern(pattern, pathname) {
   }
 
   const match = pathname.match(new RegExp(`^${regexpSource}`, 'i'))
+  if (match == null) {
+    return null
+  }
+
+  const matchedPath = match[0]
+  let remainingPathname = pathname.substr(matchedPath.length)
 
-  let remainingPathname, paramValues
-  if (match != null) {
-    const matchedPath = match[0]
-    remainingPathname = pathname.substr(matchedPath.length)
-
-    if (remainingPathname) {
-      // Require that the match ends at a path separator, if we didn't match
-      // the full path, so any remaining pathname is a new path segment.
-      if (matchedPath.charAt(matchedPath.length - 1) !== '/') {
-        return {
-          remainingPathname: null,
-          paramNames,
-          paramValues: null
-        }
-      }
-
-      // If there is a remaining pathname, treat the path separator as part of
-      // the remaining pathname for properly continuing the match.
-      remainingPathname = `/${remainingPathname}`
+  if (remainingPathname) {
+    // Require that the match ends at a path separator, if we didn't match
+    // the full path, so any remaining pathname is a new path segment.
+    if (matchedPath.charAt(matchedPath.length - 1) !== '/') {
+      return null
     }
 
-    paramValues = match.slice(1).map(v => v && decodeURIComponent(v))
-  } else {
-    remainingPathname = paramValues = null
+    // If there is a remaining pathname, treat the path separator as part of
+    // the remaining pathname for properly continuing the match.
+    remainingPathname = `/${remainingPathname}`
   }
 
   return {
     remainingPathname,
     paramNames,
-    paramValues
+    paramValues: match.slice(1).map(v => v && decodeURIComponent(v))
   }
 }
 
@@ -133,16 +125,19 @@ export function getParamNames(pattern) {
 }
 
 export function getParams(pattern, pathname) {
-  const { paramNames, paramValues } = matchPattern(pattern, pathname)
-
-  if (paramValues != null) {
-    return paramNames.reduce(function (memo, paramName, index) {
-      memo[paramName] = paramValues[index]
-      return memo
-    }, {})
+  const match = matchPattern(pattern, pathname)
+  if (!match) {
+    return null
   }
 
-  return null
+  const { paramNames, paramValues } = match
+  const params = {}
+
+  paramNames.forEach((paramName, index) => {
+    params[paramName] = paramValues[index]
+  })
+
+  return params
 }
 
 /**

modules/isActive.js

@@ -82,9 +82,13 @@ function routeIsActive(pathname, routes, params) {
 
     if (remainingPathname !== null && pattern) {
       const matched = matchPattern(pattern, remainingPathname)
-      remainingPathname = matched.remainingPathname
-      paramNames = [ ...paramNames, ...matched.paramNames ]
-      paramValues = [ ...paramValues, ...matched.paramValues ]
+      if (matched) {
+        remainingPathname = matched.remainingPathname
+        paramNames = [ ...paramNames, ...matched.paramNames ]
+        paramValues = [ ...paramValues, ...matched.paramValues ]
+      } else {
+        remainingPathname = null
+      }
 
       if (remainingPathname === '') {
         // We have an exact match on the route. Just check that all the params

modules/matchRoutes.js

@@ -89,9 +89,13 @@ function matchRouteDeep(
   // we're not just searching for potential nested absolute paths.
   if (remainingPathname !== null && pattern) {
     const matched = matchPattern(pattern, remainingPathname)
-    remainingPathname = matched.remainingPathname
-    paramNames = [ ...paramNames, ...matched.paramNames ]
-    paramValues = [ ...paramValues, ...matched.paramValues ]
+    if (matched) {
+      remainingPathname = matched.remainingPathname
+      paramNames = [ ...paramNames, ...matched.paramNames ]
+      paramValues = [ ...paramValues, ...matched.paramValues ]
+    } else {
+      remainingPathname = null
+    }
 
     // By assumption, pattern is non-empty here, which is the prerequisite for
     // actually terminating a match.

package.json

@@ -15,16 +15,16 @@
   "homepage": "https://github.com/reactjs/react-router#readme",
   "bugs": "https://github.com/reactjs/react-router/issues",
   "scripts": {
-    "build": "npm run build-cjs && npm run build-es6",
-    "build-cjs": "rimraf lib && babel ./modules -d lib --ignore '__tests__'",
-    "build-es6": "rimraf es6 && babel ./modules -d es6 --blacklist=es6.modules --ignore '__tests__'",
-    "build-umd": "NODE_ENV=development webpack modules/index.js umd/ReactRouter.js",
-    "build-min": "NODE_ENV=production webpack -p modules/index.js umd/ReactRouter.min.js",
+    "build": "npm run build-cjs && npm run build-es",
+    "build-cjs": "rimraf lib && BABEL_ENV=cjs babel ./modules -d lib --ignore '__tests__'",
+    "build-es": "rimraf es6 && BABEL_ENV=es babel ./modules -d es6 --ignore '__tests__'",
+    "build-umd": "BABEL_ENV=cjs NODE_ENV=development webpack modules/index.js umd/ReactRouter.js",
+    "build-min": "BABEL_ENV=cjs NODE_ENV=production webpack -p modules/index.js umd/ReactRouter.min.js",
     "lint": "eslint modules examples",
-    "start": "node examples/server.js",
+    "start": "BABEL_ENV=cjs node examples/server.js",
     "test": "npm run lint && npm run test-node && npm run test-browser",
-    "test-browser": "karma start",
-    "test-node": "mocha --compilers js:babel-core/register tests.node.js"
+    "test-browser": "BABEL_ENV=cjs karma start",
+    "test-node": "BABEL_ENV=cjs mocha --compilers js:babel-register tests.node.js"
   },
   "authors": [
     "Ryan Florence",
@@ -40,29 +40,36 @@
     "react": "^0.14.0 || ^15.0.0"
   },
   "devDependencies": {
-    "babel": "^5.8.38",
-    "babel-core": "^5.8.38",
-    "babel-eslint": "^4.1.8",
-    "babel-loader": "^5.4.0",
-    "babel-plugin-dev-expression": "^0.1.0",
+    "babel-cli": "^6.7.5",
+    "babel-core": "^6.7.6",
+    "babel-eslint": "^5.0.4",
+    "babel-loader": "^6.2.4",
+    "babel-plugin-add-module-exports": "^0.1.2",
+    "babel-plugin-dev-expression": "^0.2.1",
+    "babel-preset-es2015": "^6.6.0",
+    "babel-preset-es2015-loose": "^7.0.0",
+    "babel-preset-es2015-loose-native-modules": "^1.0.0",
+    "babel-preset-react": "^6.5.0",
+    "babel-preset-stage-0": "^6.5.0",
+    "babel-register": "^6.7.2",
     "bundle-loader": "^0.5.4",
     "codecov.io": "^0.1.6",
     "coveralls": "^2.11.9",
     "css-loader": "^0.23.1",
     "eslint": "^1.10.3",
     "eslint-config-rackt": "^1.1.1",
     "eslint-plugin-react": "^3.16.1",
-    "expect": "^1.16.0",
+    "expect": "^1.18.0",
     "express": "^4.13.4",
     "express-urlrewrite": "^1.2.0",
     "gzip-size": "^3.0.0",
-    "isparta-loader": "^1.0.0",
+    "isparta-loader": "^2.0.0",
     "karma": "^0.13.22",
     "karma-browserstack-launcher": "^0.1.10",
     "karma-chrome-launcher": "^0.2.3",
     "karma-coverage": "^0.5.5",
     "karma-mocha": "^0.2.2",
-    "karma-mocha-reporter": "^2.0.0",
+    "karma-mocha-reporter": "^2.0.1",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^1.7.0",
     "mocha": "^2.4.5",