fix: use graphql-relay-js from GitHub

This is to allow Webpack to see through this module and correctly
eliminate unused parts of graphql-js.

See also graphql/graphql-relay-js#208

package.json

@@ -47,7 +47,7 @@
     "express": "^4.16.3",
     "express-graphql": "^0.6.12",
     "graphql": "0.13.2",
-    "graphql-relay": "0.5.5"
+    "graphql-relay": "graphql/graphql-relay-js"
   },
   "devDependencies": {
     "babel-cli": "^6.26.0",

webpack.config.js

@@ -7,7 +7,10 @@ module.exports = {
     rules: [
       {
         test: /\.js$/,
-        exclude: /node_modules/,
+        // Exclude node_modules as usual, with one exception:
+        // Compile graphql-relay with Babel, because we're not using the
+        // precompiled version published to npm (see `alias` below).
+        exclude: /node_modules(?!\/graphql-relay\/src)/,
         use: {
           loader: 'babel-loader',
           options: {
@@ -24,6 +27,12 @@ module.exports = {
       },
     ],
   },
+  resolve: {
+    alias: {
+      // https://github.com/graphql/graphql-relay-js/issues/208
+      'graphql-relay$': 'graphql-relay/src/index.js',
+    },
+  },
   output: {
     path: __dirname + '/public',
     publicPath: '/',

yarn.lock

@@ -2922,6 +2922,10 @@ graphql-relay@0.5.5:
   version "0.5.5"
   resolved "https://registry.yarnpkg.com/graphql-relay/-/graphql-relay-0.5.5.tgz#d6815e6edd618e878d5d921c13fc66033ec867e2"
 
+graphql-relay@graphql/graphql-relay-js:
+  version "0.5.5"
+  resolved "https://codeload.github.com/graphql/graphql-relay-js/tar.gz/8055dfd534bc2c5f400ff4470974f74255f79c87"
+
 graphql@0.13.2:
   version "0.13.2"
   resolved "https://registry.yarnpkg.com/graphql/-/graphql-0.13.2.tgz#4c740ae3c222823e7004096f832e7b93b2108270"