Fix .mjs issue with GraphQL 0.13.2 (#715)

* Fix .mjs issue with GraphQL 0.13.2

graphql/graphql-js#1272 (comment)

* Fix .mjs still referencing "require"

aws-amplify/amplify-js#686 (comment)

packages/razzle/config/createConfig.js

@@ -114,7 +114,7 @@ module.exports = (
         // It is guaranteed to exist because we tweak it in `env.js`
         nodePath.split(path.delimiter).filter(Boolean)
       ),
-      extensions: ['.js', '.json', '.jsx', '.mjs'],
+      extensions: ['.mjs', '.jsx', '.js', '.json'],
       alias: {
         // This is required so symlinks work during development.
         'webpack/hot/poll': require.resolve('webpack/hot/poll'),
@@ -142,6 +142,12 @@ module.exports = (
           ],
           include: paths.appSrc,
         },
+        // Avoid "require is not defined" errors
+        {
+          test: /\.mjs$/,
+          include: /node_modules/,
+          type: "javascript/auto",
+        },
         // Transform ES6 with Babel
         {
           test: /\.(js|jsx|mjs)$/,