fix for "external" PageRenderer not working in production

packages/gatsby/src/cache-dir/gatsby-browser-entry.js

@@ -1,24 +1,7 @@
 import React from "react"
 import PropTypes from "prop-types"
 import Link, { withPrefix, push, replace, navigateTo } from "gatsby-link"
-import pages from "./pages.json"
-import loader from "./loader"
-import JSONStore from "./json-store"
-
-const PageRenderer = ({ location }) => {
-  const pageResources = loader.getResourcesForPathname(location.pathname)
-  return React.createElement(JSONStore, {
-    pages,
-    location,
-    pageResources,
-  })
-}
-
-PageRenderer.propTypes = {
-  location: PropTypes.shape({
-    pathname: PropTypes.string.isRequired,
-  }).isRequired,
-}
+import PageRenderer from "./public-page-renderer"
 
 const StaticQueryContext = React.createContext({})
 

packages/gatsby/src/cache-dir/public-page-renderer-dev.js

@@ -0,0 +1,23 @@
+import React from "react"
+import PropTypes from "prop-types"
+
+import pages from "./pages.json"
+import loader from "./loader"
+import JSONStore from "./json-store"
+
+const DevPageRenderer = ({ location }) => {
+  const pageResources = loader.getResourcesForPathname(location.pathname)
+  return React.createElement(JSONStore, {
+    pages,
+    location,
+    pageResources,
+  })
+}
+
+DevPageRenderer.propTypes = {
+  location: PropTypes.shape({
+    pathname: PropTypes.string.isRequired,
+  }).isRequired,
+}
+
+export default DevPageRenderer

packages/gatsby/src/cache-dir/public-page-renderer-prod.js

@@ -0,0 +1,21 @@
+import React from "react"
+import PropTypes from "prop-types"
+
+import InternalPageRenderer from "./page-renderer"
+import loader from "./loader"
+
+const ProdPageRenderer = ({ location }) => {
+  const pageResources = loader.getResourcesForPathname(location.pathname)
+  return React.createElement(InternalPageRenderer, {
+    location,
+    pageResources,
+  })
+}
+
+ProdPageRenderer.propTypes = {
+  location: PropTypes.shape({
+    pathname: PropTypes.string.isRequired,
+  }).isRequired,
+}
+
+export default ProdPageRenderer

packages/gatsby/src/cache-dir/public-page-renderer.js

@@ -0,0 +1,7 @@
+const preferDefault = m => (m && m.default) || m
+
+if (process.env.NODE_ENV === `production`) {
+  module.exports = preferDefault(require(`./public-page-renderer-prod`))
+} else {
+  module.exports = preferDefault(require(`./public-page-renderer-dev`))
+}