Adds gatsby-plugin-react-next and two moduleNameMapper after getting …

…error

- gatsbyjs/gatsby#2932 (comment)

gatsby-config.js

@@ -2,5 +2,5 @@ module.exports = {
   siteMetadata: {
     title: 'Gatsby Default Starter',
   },
-  plugins: ['gatsby-plugin-react-helmet'],
+  plugins: ['gatsby-plugin-react-next', 'gatsby-plugin-react-helmet'],
 }

package.json

@@ -26,9 +26,14 @@
     "testRegex": "/.*(__tests__\\/.*)|(.*(test|spec))\\.jsx?$",
     "moduleNameMapper": {
       ".+\\.(css|styl|less|sass|scss)$": "identity-obj-proxy",
-      ".+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js"
+      ".+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
+      "^react$": "gatsby-plugin-react-next/node_modules/react",
+      "^react-dom$": "gatsby-plugin-react-next/node_modules/react-dom"
     },
-    "testPathIgnorePatterns": ["node_modules", ".cache"],
+    "testPathIgnorePatterns": [
+      "node_modules",
+      ".cache"
+    ],
     "transformIgnorePatterns": [
       "node_modules/(?!(gatsby)/)"
     ],
@@ -48,6 +53,7 @@
     "@babel/preset-react": "^7.0.0",
     "babel-core": "^7.0.0-0",
     "babel-jest": "^23.6.0",
+    "gatsby-plugin-react-next": "^1.0.11",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^23.6.0",
     "prettier": "^1.13.7",

src/components/__snapshots__/header.test.js.snap

@@ -0,0 +1,32 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Header renders correctly 1`] = `
+<div
+  style={
+    Object {
+      "background": "rebeccapurple",
+      "marginBottom": "1.45rem",
+    }
+  }
+>
+  <div
+    style={
+      Object {
+        "margin": "0 auto",
+        "maxWidth": 960,
+        "padding": "1.45rem 1.0875rem",
+      }
+    }
+  >
+    <h1
+      style={
+        Object {
+          "margin": 0,
+        }
+      }
+    >
+      Hello, my name is ben
+    </h1>
+  </div>
+</div>
+`;

yarn.lock

@@ -2622,7 +2622,7 @@ core-js@^1.0.0, core-js@^1.2.6:
   version "1.2.7"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-1.2.7.tgz#652294c14651db28fa93bd2d5ff2983a4f08c636"
 
-core-js@^2.4.0, core-js@^2.5.0:
+core-js@^2.4.0, core-js@^2.5.0, core-js@^2.5.1:
   version "2.5.7"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.7.tgz#f972608ff0cead68b841a16a932d0b183791814e"
 
@@ -3963,6 +3963,15 @@ gatsby-plugin-react-helmet@^2.0.11:
   dependencies:
     babel-runtime "^6.26.0"
 
+gatsby-plugin-react-next@^1.0.11:
+  version "1.0.11"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-react-next/-/gatsby-plugin-react-next-1.0.11.tgz#715cab5ea86f64664f96af3e7f3640eecd9de5e3"
+  dependencies:
+    babel-runtime "^6.26.0"
+    core-js "^2.5.1"
+    react "^16.0.0"
+    react-dom "^16.0.0"
+
 gatsby-react-router-scroll@^1.0.18:
   version "1.0.18"
   resolved "https://registry.yarnpkg.com/gatsby-react-router-scroll/-/gatsby-react-router-scroll-1.0.18.tgz#616ffb801dbdbe4598611e2ff3861b91ac3eecbf"
@@ -7619,6 +7628,15 @@ react-dom@^15.6.0:
     object-assign "^4.1.0"
     prop-types "^15.5.10"
 
+react-dom@^16.0.0:
+  version "16.5.1"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.5.1.tgz#29d0c5a01ed3b6b4c14309aa91af6ec4eb4f292c"
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+    prop-types "^15.6.2"
+    schedule "^0.4.0"
+
 react-error-overlay@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-3.0.0.tgz#c2bc8f4d91f1375b3dad6d75265d51cd5eeaf655"
@@ -7701,6 +7719,15 @@ react@^15.6.0:
     object-assign "^4.1.0"
     prop-types "^15.5.10"
 
+react@^16.0.0:
+  version "16.5.1"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.5.1.tgz#8cb8e9f8cdcb4bde41c9a138bfbf907e66132372"
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+    prop-types "^15.6.2"
+    schedule "^0.4.0"
+
 read-cache@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/read-cache/-/read-cache-1.0.0.tgz#e664ef31161166c9751cdbe8dbcf86b5fb58f774"