Fragments bodies where added multiple times (duplicates)

src/index.js

@@ -159,7 +159,9 @@ function gql(/* arguments */) {
 
   for (var i = 1; i < args.length; i++) {
     if (args[i] && args[i].kind && args[i].kind === 'Document') {
-      result += args[i].loc.source.body;
+      var body = args[i].loc.source.body;
+      // Dont add body's that where already added by other documents
+      if (result.indexOf(body) === -1) result += body;
     } else {
       result += args[i];
     }

test/graphql.js

@@ -327,6 +327,59 @@ const assert = require('chai').assert;
       `);
     });
 
+    it('can include fragments sources only once if they are nested and used multiple times', () => {
+      const fragmentB = gql`
+        fragment FragmentB on Other {
+          number
+        }
+      `;
+
+      const fragmentA = gql`
+        fragment FragmentA on Something {
+          value
+          other {
+            ...FragmentB
+          }
+        }
+        ${fragmentB}
+      `;
+
+      const ast = gql`
+        query Query {
+          a {
+            ...FragmentA
+          }
+          b {
+            ...FragmentB
+          }
+        }
+        ${fragmentA}
+        ${fragmentB}
+      `;
+
+      assert.deepEqual(ast, gql`
+        query Query {
+          a {
+            ...FragmentA
+          }          
+          b {
+            ...FragmentB
+          }
+        }
+
+        fragment FragmentA on Something {
+          value
+          other {
+            ...FragmentB
+          }
+        }
+
+        fragment FragmentB on Other {
+          number
+        }
+      `);
+    });
+
     describe('fragment warnings', () => {
       let warnings = [];
       const oldConsoleWarn = console.warn;